diff options
Diffstat (limited to 'lib/librte_bitratestats/rte_bitrate.c')
| -rw-r--r-- | lib/librte_bitratestats/rte_bitrate.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/lib/librte_bitratestats/rte_bitrate.c b/lib/librte_bitratestats/rte_bitrate.c new file mode 100644 index 00000000..193aa690 --- /dev/null +++ b/lib/librte_bitratestats/rte_bitrate.c @@ -0,0 +1,153 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2017 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * 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. + * * Neither the name of Intel Corporation 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 COPYRIGHT HOLDERS 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 COPYRIGHT + * OWNER 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. + */ + +#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, + uint8_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 divison */ + 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; +} |