nes-proj/os/net/mac/tsch/tsch-stats.c

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2018-08-31 14:11:25 +00:00
/*
* Copyright (c) 2016-2017, University of Bristol - http://www.bristol.ac.uk
*
* 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 copyright holder 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.
*
*/
/**
* \file
* Source file for TSCH statistics
* \author
* Atis Elsts <atis.elsts@bristol.ac.uk>
*/
#include "contiki.h"
#include "net/mac/tsch/tsch.h"
#include "net/netstack.h"
#include "dev/radio.h"
/* Log configuration */
#include "sys/log.h"
#define LOG_MODULE "TSCH Stats"
#define LOG_LEVEL LOG_LEVEL_MAC
/*---------------------------------------------------------------------------*/
#if TSCH_STATS_ON
/*---------------------------------------------------------------------------*/
struct tsch_global_stats tsch_stats;
struct tsch_neighbor_stats tsch_neighbor_stats;
/* Called every TSCH_STATS_DECAY_INTERVAL ticks */
static struct ctimer periodic_timer;
static void periodic(void *);
/*---------------------------------------------------------------------------*/
void
tsch_stats_init(void)
{
#if TSCH_STATS_SAMPLE_NOISE_RSSI
int i;
for(i = 0; i < TSCH_STATS_NUM_CHANNELS; ++i) {
tsch_stats.noise_rssi[i] = TSCH_STATS_DEFAULT_RSSI;
tsch_stats.channel_free_ewma[i] = TSCH_STATS_DEFAULT_CHANNEL_FREE;
}
#endif
tsch_stats_reset_neighbor_stats();
/* Start the periodic processing soonish */
ctimer_set(&periodic_timer, TSCH_STATS_DECAY_INTERVAL / 10, periodic, NULL);
}
/*---------------------------------------------------------------------------*/
void
tsch_stats_reset_neighbor_stats(void)
{
int i;
struct tsch_channel_stats *ch_stats;
ch_stats = tsch_neighbor_stats.channel_stats;
for(i = 0; i < TSCH_STATS_NUM_CHANNELS; ++i) {
ch_stats[i].rssi = TSCH_STATS_DEFAULT_RSSI;
ch_stats[i].lqi = TSCH_STATS_DEFAULT_LQI;
ch_stats[i].p_tx_success = TSCH_STATS_DEFAULT_P_TX;
}
}
/*---------------------------------------------------------------------------*/
struct tsch_neighbor_stats *
tsch_stats_get_from_neighbor(struct tsch_neighbor *n)
{
/* Due to RAM limitations, this module only collects neighbor stats about the time source */
if(n != NULL && n->is_time_source) {
return &tsch_neighbor_stats;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
void
tsch_stats_tx_packet(struct tsch_neighbor *n, uint8_t mac_status, uint8_t channel)
{
struct tsch_neighbor_stats *stats;
stats = tsch_stats_get_from_neighbor(n);
if(stats != NULL) {
uint8_t index = tsch_stats_channel_to_index(channel);
uint16_t new_tx_value = (mac_status == MAC_TX_OK ? 1 : 0);
new_tx_value *= TSCH_STATS_BINARY_SCALING_FACTOR;
TSCH_STATS_EWMA_UPDATE(stats->channel_stats[index].p_tx_success, new_tx_value);
}
}
/*---------------------------------------------------------------------------*/
void
tsch_stats_rx_packet(struct tsch_neighbor *n, int8_t rssi, uint8_t lqi, uint8_t channel)
{
struct tsch_neighbor_stats *stats;
stats = tsch_stats_get_from_neighbor(n);
if(stats != NULL) {
uint8_t index = tsch_stats_channel_to_index(channel);
TSCH_STATS_EWMA_UPDATE(stats->channel_stats[index].rssi,
TSCH_STATS_TRANSFORM(rssi, TSCH_STATS_RSSI_SCALING_FACTOR));
TSCH_STATS_EWMA_UPDATE(stats->channel_stats[index].lqi,
TSCH_STATS_TRANSFORM(lqi, TSCH_STATS_LQI_SCALING_FACTOR));
}
}
/*---------------------------------------------------------------------------*/
void
tsch_stats_on_time_synchronization(int32_t sync_error)
{
/* Update the maximal error so far if the absolute value of the new one is larger */
tsch_stats.max_sync_error = MAX(tsch_stats.max_sync_error, ABS(sync_error));
}
/*---------------------------------------------------------------------------*/
void
tsch_stats_sample_rssi(void)
{
#if TSCH_STATS_SAMPLE_NOISE_RSSI
uint8_t index;
radio_value_t value;
radio_result_t rv;
static uint8_t measurement_channel = TSCH_STATS_FIRST_CHANNEL;
index = tsch_stats_channel_to_index(measurement_channel);
/* Select the measurement channel */
NETSTACK_RADIO.set_value(RADIO_PARAM_CHANNEL, measurement_channel);
/* Need to explicitly turn on for Coojamotes */
NETSTACK_RADIO.on();
/* Measure the background noise RSSI and act on it */
rv = NETSTACK_RADIO.get_value(RADIO_PARAM_RSSI, &value);
if(rv == RADIO_RESULT_OK) {
tsch_stat_t prev_busyness_metric;
uint16_t is_free;
is_free = (((int)value <= TSCH_STATS_BUSY_CHANNEL_RSSI) ? 1 : 0) * TSCH_STATS_BINARY_SCALING_FACTOR;
/* LOG_DBG("noise RSSI on %u: %d\n", measurement_channel, (int)value); */
TSCH_STATS_EWMA_UPDATE(tsch_stats.noise_rssi[index],
TSCH_STATS_TRANSFORM((int)value, TSCH_STATS_RSSI_SCALING_FACTOR));
prev_busyness_metric = tsch_stats.channel_free_ewma[index];
(void)prev_busyness_metric;
TSCH_STATS_EWMA_UPDATE(tsch_stats.channel_free_ewma[index], is_free);
/* potentially select a new TSCH hopping sequence */
#ifdef TSCH_CALLBACK_CHANNEL_STATS_UPDATED
TSCH_CALLBACK_CHANNEL_STATS_UPDATED(measurement_channel, prev_busyness_metric);
#endif
} else {
LOG_ERR("! sampling RSSI failed: %d\n", (int)rv);
}
/* Increment the channel index for the next time */
measurement_channel++;
if(measurement_channel >= TSCH_STATS_FIRST_CHANNEL + TSCH_STATS_NUM_CHANNELS) {
measurement_channel = TSCH_STATS_FIRST_CHANNEL;
}
#endif /* TSCH_STATS_SAMPLE_NOISE_RSSI */
}
/*---------------------------------------------------------------------------*/
/* Periodic timer called every TSCH_STATS_DECAY_INTERVAL ticks */
static void
periodic(void *ptr)
{
int i;
struct tsch_neighbor *timesource;
struct tsch_channel_stats *stats = tsch_neighbor_stats.channel_stats;
#if TSCH_STATS_SAMPLE_NOISE_RSSI
LOG_DBG("Noise RSSI:\n");
for(i = 0; i < TSCH_STATS_NUM_CHANNELS; ++i) {
LOG_DBG(" channel %u: %d rssi, %u/%u free\n",
TSCH_STATS_FIRST_CHANNEL + i,
tsch_stats.noise_rssi[i] / TSCH_STATS_RSSI_SCALING_FACTOR,
tsch_stats.channel_free_ewma[i],
TSCH_STATS_BINARY_SCALING_FACTOR);
}
#endif
timesource = tsch_queue_get_time_source();
if(timesource != NULL) {
LOG_DBG("Time source neighbor:\n");
for(i = 0; i < TSCH_STATS_NUM_CHANNELS; ++i) {
LOG_DBG(" channel %u: %d rssi, %u lqi, %u/%u P(tx)\n",
TSCH_STATS_FIRST_CHANNEL + i,
stats[i].rssi / TSCH_STATS_RSSI_SCALING_FACTOR,
stats[i].lqi / TSCH_STATS_LQI_SCALING_FACTOR,
stats[i].p_tx_success,
TSCH_STATS_BINARY_SCALING_FACTOR);
}
}
/* Do not decay the periodic global stats, as they are updated independely of packet rate */
for(i = 0; i < TSCH_STATS_NUM_CHANNELS; ++i) {
/* decay Rx stats */
TSCH_STATS_EWMA_UPDATE(stats[i].rssi, TSCH_STATS_DEFAULT_RSSI);
TSCH_STATS_EWMA_UPDATE(stats[i].lqi, TSCH_STATS_DEFAULT_LQI);
/* decay Tx stats */
TSCH_STATS_EWMA_UPDATE(stats[i].p_tx_success, TSCH_STATS_DEFAULT_P_TX);
}
ctimer_set(&periodic_timer, TSCH_STATS_DECAY_INTERVAL, periodic, NULL);
}
/*---------------------------------------------------------------------------*/
#endif /* TSCH_STATS_ON */
/*---------------------------------------------------------------------------*/