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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 Intel Corporation
*/
#include <rte_common.h>
#include <rte_ethdev.h>
#include <rte_malloc.h>
#include <rte_metrics.h>
#include <rte_bitrate.h>
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/*
* Persistent bit-rate data.
* @internal
*/
struct rte_stats_bitrate {
uint64_t last_ibytes;
uint64_t last_obytes;
uint64_t peak_ibits;
uint64_t peak_obits;
uint64_t mean_ibits;
uint64_t mean_obits;
uint64_t ewma_ibits;
uint64_t ewma_obits;
};
struct rte_stats_bitrates {
struct rte_stats_bitrate port_stats[RTE_MAX_ETHPORTS];
uint16_t id_stats_set;
};
struct rte_stats_bitrates *
rte_stats_bitrate_create(void)
{
return rte_zmalloc(NULL, sizeof(struct rte_stats_bitrates),
RTE_CACHE_LINE_SIZE);
}
int
rte_stats_bitrate_reg(struct rte_stats_bitrates *bitrate_data)
{
const char * const names[] = {
"ewma_bits_in", "ewma_bits_out",
"mean_bits_in", "mean_bits_out",
"peak_bits_in", "peak_bits_out",
};
int return_value;
return_value = rte_metrics_reg_names(&names[0], ARRAY_SIZE(names));
if (return_value >= 0)
bitrate_data->id_stats_set = return_value;
return return_value;
}
int
rte_stats_bitrate_calc(struct rte_stats_bitrates *bitrate_data,
uint16_t port_id)
{
struct rte_stats_bitrate *port_data;
struct rte_eth_stats eth_stats;
int ret_code;
uint64_t cnt_bits;
int64_t delta;
const int64_t alpha_percent = 20;
uint64_t values[6];
ret_code = rte_eth_stats_get(port_id, ð_stats);
if (ret_code != 0)
return ret_code;
port_data = &bitrate_data->port_stats[port_id];
/* Incoming bitrate. This is an iteratively calculated EWMA
* (Exponentially Weighted Moving Average) that uses a
* weighting factor of alpha_percent. An unsmoothed mean
* for just the current time delta is also calculated for the
* benefit of people who don't understand signal processing.
*/
cnt_bits = (eth_stats.ibytes - port_data->last_ibytes) << 3;
port_data->last_ibytes = eth_stats.ibytes;
if (cnt_bits > port_data->peak_ibits)
port_data->peak_ibits = cnt_bits;
delta = cnt_bits;
delta -= port_data->ewma_ibits;
/* The +-50 fixes integer rounding during division */
if (delta > 0)
delta = (delta * alpha_percent + 50) / 100;
else
delta = (delta * alpha_percent - 50) / 100;
port_data->ewma_ibits += delta;
/* Integer roundoff prevents EWMA between 0 and (100/alpha_percent)
* ever reaching zero in no-traffic conditions
*/
if (cnt_bits == 0 && delta == 0)
port_data->ewma_ibits = 0;
port_data->mean_ibits = cnt_bits;
/* Outgoing bitrate (also EWMA) */
cnt_bits = (eth_stats.obytes - port_data->last_obytes) << 3;
port_data->last_obytes = eth_stats.obytes;
if (cnt_bits > port_data->peak_obits)
port_data->peak_obits = cnt_bits;
delta = cnt_bits;
delta -= port_data->ewma_obits;
if (delta > 0)
delta = (delta * alpha_percent + 50) / 100;
else
delta = (delta * alpha_percent - 50) / 100;
port_data->ewma_obits += delta;
if (cnt_bits == 0 && delta == 0)
port_data->ewma_obits = 0;
port_data->mean_obits = cnt_bits;
values[0] = port_data->ewma_ibits;
values[1] = port_data->ewma_obits;
values[2] = port_data->mean_ibits;
values[3] = port_data->mean_obits;
values[4] = port_data->peak_ibits;
values[5] = port_data->peak_obits;
rte_metrics_update_values(port_id, bitrate_data->id_stats_set,
values, ARRAY_SIZE(values));
return 0;
}
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