154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2017 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <rte_common.h>
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#include <rte_ethdev.h>
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#include <rte_malloc.h>
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#include <rte_metrics.h>
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#include <rte_bitrate.h>
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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/*
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* Persistent bit-rate data.
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* @internal
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*/
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struct rte_stats_bitrate {
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uint64_t last_ibytes;
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uint64_t last_obytes;
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uint64_t peak_ibits;
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uint64_t peak_obits;
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uint64_t mean_ibits;
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uint64_t mean_obits;
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uint64_t ewma_ibits;
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uint64_t ewma_obits;
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};
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struct rte_stats_bitrates {
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struct rte_stats_bitrate port_stats[RTE_MAX_ETHPORTS];
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uint16_t id_stats_set;
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};
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struct rte_stats_bitrates *
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rte_stats_bitrate_create(void)
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{
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return rte_zmalloc(NULL, sizeof(struct rte_stats_bitrates),
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RTE_CACHE_LINE_SIZE);
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}
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int
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rte_stats_bitrate_reg(struct rte_stats_bitrates *bitrate_data)
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{
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const char * const names[] = {
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"ewma_bits_in", "ewma_bits_out",
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"mean_bits_in", "mean_bits_out",
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"peak_bits_in", "peak_bits_out",
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};
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int return_value;
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return_value = rte_metrics_reg_names(&names[0], ARRAY_SIZE(names));
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if (return_value >= 0)
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bitrate_data->id_stats_set = return_value;
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return return_value;
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}
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int
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rte_stats_bitrate_calc(struct rte_stats_bitrates *bitrate_data,
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uint16_t port_id)
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{
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struct rte_stats_bitrate *port_data;
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struct rte_eth_stats eth_stats;
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int ret_code;
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uint64_t cnt_bits;
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int64_t delta;
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const int64_t alpha_percent = 20;
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uint64_t values[6];
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ret_code = rte_eth_stats_get(port_id, ð_stats);
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if (ret_code != 0)
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return ret_code;
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port_data = &bitrate_data->port_stats[port_id];
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/* Incoming bitrate. This is an iteratively calculated EWMA
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* (Exponentially Weighted Moving Average) that uses a
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* weighting factor of alpha_percent. An unsmoothed mean
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* for just the current time delta is also calculated for the
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* benefit of people who don't understand signal processing.
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*/
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cnt_bits = (eth_stats.ibytes - port_data->last_ibytes) << 3;
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port_data->last_ibytes = eth_stats.ibytes;
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if (cnt_bits > port_data->peak_ibits)
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port_data->peak_ibits = cnt_bits;
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delta = cnt_bits;
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delta -= port_data->ewma_ibits;
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/* The +-50 fixes integer rounding during division */
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if (delta > 0)
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delta = (delta * alpha_percent + 50) / 100;
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else
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delta = (delta * alpha_percent - 50) / 100;
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port_data->ewma_ibits += delta;
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/* Integer roundoff prevents EWMA between 0 and (100/alpha_percent)
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* ever reaching zero in no-traffic conditions
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*/
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if (cnt_bits == 0 && delta == 0)
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port_data->ewma_ibits = 0;
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port_data->mean_ibits = cnt_bits;
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/* Outgoing bitrate (also EWMA) */
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cnt_bits = (eth_stats.obytes - port_data->last_obytes) << 3;
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port_data->last_obytes = eth_stats.obytes;
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if (cnt_bits > port_data->peak_obits)
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port_data->peak_obits = cnt_bits;
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delta = cnt_bits;
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delta -= port_data->ewma_obits;
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if (delta > 0)
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delta = (delta * alpha_percent + 50) / 100;
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else
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delta = (delta * alpha_percent - 50) / 100;
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port_data->ewma_obits += delta;
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if (cnt_bits == 0 && delta == 0)
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port_data->ewma_obits = 0;
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port_data->mean_obits = cnt_bits;
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values[0] = port_data->ewma_ibits;
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values[1] = port_data->ewma_obits;
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values[2] = port_data->mean_ibits;
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values[3] = port_data->mean_obits;
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values[4] = port_data->peak_ibits;
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values[5] = port_data->peak_obits;
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rte_metrics_update_values(port_id, bitrate_data->id_stats_set,
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values, ARRAY_SIZE(values));
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return 0;
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}
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