--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2014 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.
+ */
+
+#ifndef __INCLUDE_RTE_METER_H__
+#define __INCLUDE_RTE_METER_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @file
+ * RTE Traffic Metering
+ *
+ * Traffic metering algorithms:
+ * 1. Single Rate Three Color Marker (srTCM): defined by IETF RFC 2697
+ * 2. Two Rate Three Color Marker (trTCM): defined by IETF RFC 2698
+ *
+ ***/
+
+#include <stdint.h>
+
+/*
+ * Application Programmer's Interface (API)
+ *
+ ***/
+
+/** Packet Color Set */
+enum rte_meter_color {
+ e_RTE_METER_GREEN = 0, /**< Green */
+ e_RTE_METER_YELLOW, /**< Yellow */
+ e_RTE_METER_RED, /**< Red */
+ e_RTE_METER_COLORS /**< Number of available colors */
+};
+
+/** srTCM parameters per metered traffic flow. The CIR, CBS and EBS parameters only
+count bytes of IP packets and do not include link specific headers. At least one of
+the CBS or EBS parameters has to be greater than zero. */
+struct rte_meter_srtcm_params {
+ uint64_t cir; /**< Committed Information Rate (CIR). Measured in bytes per second. */
+ uint64_t cbs; /**< Committed Burst Size (CBS). Measured in bytes. */
+ uint64_t ebs; /**< Excess Burst Size (EBS). Measured in bytes. */
+};
+
+/** trTCM parameters per metered traffic flow. The CIR, PIR, CBS and PBS parameters
+only count bytes of IP packets and do not include link specific headers. PIR has to
+be greater than or equal to CIR. Both CBS or EBS have to be greater than zero. */
+struct rte_meter_trtcm_params {
+ uint64_t cir; /**< Committed Information Rate (CIR). Measured in bytes per second. */
+ uint64_t pir; /**< Peak Information Rate (PIR). Measured in bytes per second. */
+ uint64_t cbs; /**< Committed Burst Size (CBS). Measured in byes. */
+ uint64_t pbs; /**< Peak Burst Size (PBS). Measured in bytes. */
+};
+
+/** Internal data structure storing the srTCM run-time context per metered traffic flow. */
+struct rte_meter_srtcm;
+
+/** Internal data structure storing the trTCM run-time context per metered traffic flow. */
+struct rte_meter_trtcm;
+
+/**
+ * srTCM configuration per metered traffic flow
+ *
+ * @param m
+ * Pointer to pre-allocated srTCM data structure
+ * @param params
+ * User parameters per srTCM metered traffic flow
+ * @return
+ * 0 upon success, error code otherwise
+ */
+int
+rte_meter_srtcm_config(struct rte_meter_srtcm *m,
+ struct rte_meter_srtcm_params *params);
+
+/**
+ * trTCM configuration per metered traffic flow
+ *
+ * @param m
+ * Pointer to pre-allocated trTCM data structure
+ * @param params
+ * User parameters per trTCM metered traffic flow
+ * @return
+ * 0 upon success, error code otherwise
+ */
+int
+rte_meter_trtcm_config(struct rte_meter_trtcm *m,
+ struct rte_meter_trtcm_params *params);
+
+/**
+ * srTCM color blind traffic metering
+ *
+ * @param m
+ * Handle to srTCM instance
+ * @param time
+ * Current CPU time stamp (measured in CPU cycles)
+ * @param pkt_len
+ * Length of the current IP packet (measured in bytes)
+ * @return
+ * Color assigned to the current IP packet
+ */
+static inline enum rte_meter_color
+rte_meter_srtcm_color_blind_check(struct rte_meter_srtcm *m,
+ uint64_t time,
+ uint32_t pkt_len);
+
+/**
+ * srTCM color aware traffic metering
+ *
+ * @param m
+ * Handle to srTCM instance
+ * @param time
+ * Current CPU time stamp (measured in CPU cycles)
+ * @param pkt_len
+ * Length of the current IP packet (measured in bytes)
+ * @param pkt_color
+ * Input color of the current IP packet
+ * @return
+ * Color assigned to the current IP packet
+ */
+static inline enum rte_meter_color
+rte_meter_srtcm_color_aware_check(struct rte_meter_srtcm *m,
+ uint64_t time,
+ uint32_t pkt_len,
+ enum rte_meter_color pkt_color);
+
+/**
+ * trTCM color blind traffic metering
+ *
+ * @param m
+ * Handle to trTCM instance
+ * @param time
+ * Current CPU time stamp (measured in CPU cycles)
+ * @param pkt_len
+ * Length of the current IP packet (measured in bytes)
+ * @return
+ * Color assigned to the current IP packet
+ */
+static inline enum rte_meter_color
+rte_meter_trtcm_color_blind_check(struct rte_meter_trtcm *m,
+ uint64_t time,
+ uint32_t pkt_len);
+
+/**
+ * trTCM color aware traffic metering
+ *
+ * @param m
+ * Handle to trTCM instance
+ * @param time
+ * Current CPU time stamp (measured in CPU cycles)
+ * @param pkt_len
+ * Length of the current IP packet (measured in bytes)
+ * @param pkt_color
+ * Input color of the current IP packet
+ * @return
+ * Color assigned to the current IP packet
+ */
+static inline enum rte_meter_color
+rte_meter_trtcm_color_aware_check(struct rte_meter_trtcm *m,
+ uint64_t time,
+ uint32_t pkt_len,
+ enum rte_meter_color pkt_color);
+
+/*
+ * Inline implementation of run-time methods
+ *
+ ***/
+
+/* Internal data structure storing the srTCM run-time context per metered traffic flow. */
+struct rte_meter_srtcm {
+ uint64_t time; /* Time of latest update of C and E token buckets */
+ uint64_t tc; /* Number of bytes currently available in the committed (C) token bucket */
+ uint64_t te; /* Number of bytes currently available in the excess (E) token bucket */
+ uint64_t cbs; /* Upper limit for C token bucket */
+ uint64_t ebs; /* Upper limit for E token bucket */
+ uint64_t cir_period; /* Number of CPU cycles for one update of C and E token buckets */
+ uint64_t cir_bytes_per_period; /* Number of bytes to add to C and E token buckets on each update */
+};
+
+/* Internal data structure storing the trTCM run-time context per metered traffic flow. */
+struct rte_meter_trtcm {
+ uint64_t time_tc; /* Time of latest update of C token bucket */
+ uint64_t time_tp; /* Time of latest update of E token bucket */
+ uint64_t tc; /* Number of bytes currently available in the committed (C) token bucket */
+ uint64_t tp; /* Number of bytes currently available in the peak (P) token bucket */
+ uint64_t cbs; /* Upper limit for C token bucket */
+ uint64_t pbs; /* Upper limit for P token bucket */
+ uint64_t cir_period; /* Number of CPU cycles for one update of C token bucket */
+ uint64_t cir_bytes_per_period; /* Number of bytes to add to C token bucket on each update */
+ uint64_t pir_period; /* Number of CPU cycles for one update of P token bucket */
+ uint64_t pir_bytes_per_period; /* Number of bytes to add to P token bucket on each update */
+};
+
+static inline enum rte_meter_color
+rte_meter_srtcm_color_blind_check(struct rte_meter_srtcm *m,
+ uint64_t time,
+ uint32_t pkt_len)
+{
+ uint64_t time_diff, n_periods, tc, te;
+
+ /* Bucket update */
+ time_diff = time - m->time;
+ n_periods = time_diff / m->cir_period;
+ m->time += n_periods * m->cir_period;
+
+ tc = m->tc + n_periods * m->cir_bytes_per_period;
+ if (tc > m->cbs)
+ tc = m->cbs;
+
+ te = m->te + n_periods * m->cir_bytes_per_period;
+ if (te > m->ebs)
+ te = m->ebs;
+
+ /* Color logic */
+ if (tc >= pkt_len) {
+ m->tc = tc - pkt_len;
+ m->te = te;
+ return e_RTE_METER_GREEN;
+ }
+
+ if (te >= pkt_len) {
+ m->tc = tc;
+ m->te = te - pkt_len;
+ return e_RTE_METER_YELLOW;
+ }
+
+ m->tc = tc;
+ m->te = te;
+ return e_RTE_METER_RED;
+}
+
+static inline enum rte_meter_color
+rte_meter_srtcm_color_aware_check(struct rte_meter_srtcm *m,
+ uint64_t time,
+ uint32_t pkt_len,
+ enum rte_meter_color pkt_color)
+{
+ uint64_t time_diff, n_periods, tc, te;
+
+ /* Bucket update */
+ time_diff = time - m->time;
+ n_periods = time_diff / m->cir_period;
+ m->time += n_periods * m->cir_period;
+
+ tc = m->tc + n_periods * m->cir_bytes_per_period;
+ if (tc > m->cbs)
+ tc = m->cbs;
+
+ te = m->te + n_periods * m->cir_bytes_per_period;
+ if (te > m->ebs)
+ te = m->ebs;
+
+ /* Color logic */
+ if ((pkt_color == e_RTE_METER_GREEN) && (tc >= pkt_len)) {
+ m->tc = tc - pkt_len;
+ m->te = te;
+ return e_RTE_METER_GREEN;
+ }
+
+ if ((pkt_color != e_RTE_METER_RED) && (te >= pkt_len)) {
+ m->tc = tc;
+ m->te = te - pkt_len;
+ return e_RTE_METER_YELLOW;
+ }
+
+ m->tc = tc;
+ m->te = te;
+ return e_RTE_METER_RED;
+}
+
+static inline enum rte_meter_color
+rte_meter_trtcm_color_blind_check(struct rte_meter_trtcm *m,
+ uint64_t time,
+ uint32_t pkt_len)
+{
+ uint64_t time_diff_tc, time_diff_tp, n_periods_tc, n_periods_tp, tc, tp;
+
+ /* Bucket update */
+ time_diff_tc = time - m->time_tc;
+ time_diff_tp = time - m->time_tp;
+ n_periods_tc = time_diff_tc / m->cir_period;
+ n_periods_tp = time_diff_tp / m->pir_period;
+ m->time_tc += n_periods_tc * m->cir_period;
+ m->time_tp += n_periods_tp * m->pir_period;
+
+ tc = m->tc + n_periods_tc * m->cir_bytes_per_period;
+ if (tc > m->cbs)
+ tc = m->cbs;
+
+ tp = m->tp + n_periods_tp * m->pir_bytes_per_period;
+ if (tp > m->pbs)
+ tp = m->pbs;
+
+ /* Color logic */
+ if (tp < pkt_len) {
+ m->tc = tc;
+ m->tp = tp;
+ return e_RTE_METER_RED;
+ }
+
+ if (tc < pkt_len) {
+ m->tc = tc;
+ m->tp = tp - pkt_len;
+ return e_RTE_METER_YELLOW;
+ }
+
+ m->tc = tc - pkt_len;
+ m->tp = tp - pkt_len;
+ return e_RTE_METER_GREEN;
+}
+
+static inline enum rte_meter_color
+rte_meter_trtcm_color_aware_check(struct rte_meter_trtcm *m,
+ uint64_t time,
+ uint32_t pkt_len,
+ enum rte_meter_color pkt_color)
+{
+ uint64_t time_diff_tc, time_diff_tp, n_periods_tc, n_periods_tp, tc, tp;
+
+ /* Bucket update */
+ time_diff_tc = time - m->time_tc;
+ time_diff_tp = time - m->time_tp;
+ n_periods_tc = time_diff_tc / m->cir_period;
+ n_periods_tp = time_diff_tp / m->pir_period;
+ m->time_tc += n_periods_tc * m->cir_period;
+ m->time_tp += n_periods_tp * m->pir_period;
+
+ tc = m->tc + n_periods_tc * m->cir_bytes_per_period;
+ if (tc > m->cbs)
+ tc = m->cbs;
+
+ tp = m->tp + n_periods_tp * m->pir_bytes_per_period;
+ if (tp > m->pbs)
+ tp = m->pbs;
+
+ /* Color logic */
+ if ((pkt_color == e_RTE_METER_RED) || (tp < pkt_len)) {
+ m->tc = tc;
+ m->tp = tp;
+ return e_RTE_METER_RED;
+ }
+
+ if ((pkt_color == e_RTE_METER_YELLOW) || (tc < pkt_len)) {
+ m->tc = tc;
+ m->tp = tp - pkt_len;
+ return e_RTE_METER_YELLOW;
+ }
+
+ m->tc = tc - pkt_len;
+ m->tp = tp - pkt_len;
+ return e_RTE_METER_GREEN;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_RTE_METER_H__ */
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