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diff --git a/lib/librte_bitratestats/rte_bitrate.c b/lib/librte_bitratestats/rte_bitrate.c
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+/*-
+ * 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, &eth_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;
+}