flow_random_sample.c

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/*
 * Copyright (c) 2023 NVIDIA CORPORATION AND AFFILIATES.  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 the NVIDIA 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 NVIDIA CORPORATION 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 TOR (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 <stdint.h>
#include <string.h>
#include <unistd.h>
 
#include <rte_ethdev.h>
 
#include <doca_log.h>
#include <doca_flow.h>
#include <doca_bitfield.h>
 
#include "doca_error.h"
#include "flow_common.h"
 
DOCA_LOG_REGISTER(FLOW_RANDOM);
 
/* The number of packets in the rx queue */
#define PACKET_BURST 256
 
/* The number of bits in random field */
#define RANDOM_WIDTH 16
 
/* Get the percentage according to part and total */
#define GET_PERCENTAGE(part, total) (((double)part / (double)total) * 100)
 
/*
 * Create DOCA Flow pipe with changeable 5 tuple match as root
 *
 * @port [in]: port of the pipe
 * @pipe [out]: created pipe pointer
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t create_root_pipe(struct doca_flow_port *port, struct doca_flow_pipe **pipe)
{
    struct doca_flow_match match;
    struct doca_flow_monitor monitor;
    struct doca_flow_fwd fwd;
    struct doca_flow_pipe_cfg *pipe_cfg;
    doca_error_t result;
 
    memset(&match, 0, sizeof(match));
    memset(&monitor, 0, sizeof(monitor));
    memset(&fwd, 0, sizeof(fwd));
 
    /* 5 tuple match */
    match.parser_meta.outer_l4_type = DOCA_FLOW_L4_META_TCP;
    match.parser_meta.outer_l3_type = DOCA_FLOW_L3_META_IPV4;
    match.outer.l4_type_ext = DOCA_FLOW_L4_TYPE_EXT_TCP;
    match.outer.l3_type = DOCA_FLOW_L3_TYPE_IP4;
    match.outer.ip4.src_ip = 0xffffffff;
    match.outer.ip4.dst_ip = 0xffffffff;
    match.outer.tcp.l4_port.src_port = 0xffff;
    match.outer.tcp.l4_port.dst_port = 0xffff;
 
    /* Add counter to see how many packet arrived before sampling/distribution */
    monitor.counter_type = DOCA_FLOW_RESOURCE_TYPE_NON_SHARED;
 
    result = doca_flow_pipe_cfg_create(&pipe_cfg, port);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to create doca_flow_pipe_cfg: %s", doca_error_get_descr(result));
        return result;
    }
 
    result = set_flow_pipe_cfg(pipe_cfg, "ROOT_PIPE", DOCA_FLOW_PIPE_BASIC, true);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_nr_entries(pipe_cfg, 2);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg nr_entries: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_match(pipe_cfg, &match, NULL);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg match: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_monitor(pipe_cfg, &monitor);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg monitor: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
 
    fwd.type = DOCA_FLOW_FWD_PIPE;
    fwd.next_pipe = NULL;
 
    result = doca_flow_pipe_create(pipe_cfg, &fwd, NULL, pipe);
destroy_pipe_cfg:
    doca_flow_pipe_cfg_destroy(pipe_cfg);
    return result;
}
 
/*
 * Add DOCA Flow pipe entry to the root pipe that forwards the traffic to specific random pipe.
 *
 * @pipe [in]: pipe of the entries.
 * @next_pipe [in]: random pipe to forward the matched traffic.
 * @src_ip_addr [in]: the source IP address to match on in this entry.
 * @status [in]: user context for adding entry.
 * @entry [out]: created entry pointer.
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t add_root_pipe_entry(struct doca_flow_pipe *pipe,
                    struct doca_flow_pipe *next_pipe,
                    doca_be32_t src_ip_addr,
                    struct entries_status *status,
                    struct doca_flow_pipe_entry **entry)
{
    struct doca_flow_match match;
    struct doca_flow_fwd fwd;
 
    memset(&match, 0, sizeof(match));
    memset(&fwd, 0, sizeof(fwd));
 
    match.outer.ip4.dst_ip = BE_IPV4_ADDR(8, 8, 8, 8);
    match.outer.ip4.src_ip = src_ip_addr;
    match.outer.tcp.l4_port.dst_port = rte_cpu_to_be_16(80);
    match.outer.tcp.l4_port.src_port = rte_cpu_to_be_16(1234);
 
    fwd.type = DOCA_FLOW_FWD_PIPE;
    fwd.next_pipe = next_pipe;
 
    return doca_flow_pipe_add_entry(0, pipe, &match, NULL, NULL, &fwd, 0, status, entry);
}
 
/*
 * Add DOCA Flow pipe entries to the root pipe that forwards the traffic to random pipes.
 *
 * @pipe [in]: pipe of the entries.
 * @status [in]: user context for adding entry
 * @distribution_pipe [in]: distribution random pipe to forward the matched traffic.
 * @sampling_pipe [in]: sampling random pipe to forward the matched traffic.
 * @distribution_entry [out]: created distribution entry pointer.
 * @sampling_entry [out]: created sampling entry pointer.
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t add_root_pipe_entries(struct doca_flow_pipe *pipe,
                      struct entries_status *status,
                      struct doca_flow_pipe *distribution_pipe,
                      struct doca_flow_pipe *sampling_pipe,
                      struct doca_flow_pipe_entry **distribution_entry,
                      struct doca_flow_pipe_entry **sampling_entry)
{
    doca_be32_t src_ip_addr;
    doca_error_t result;
 
    src_ip_addr = BE_IPV4_ADDR(1, 1, 1, 1);
    result = add_root_pipe_entry(pipe, sampling_pipe, src_ip_addr, status, sampling_entry);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to add entry - go to sampling pipe: %s", doca_error_get_descr(result));
        return result;
    }
 
    src_ip_addr = BE_IPV4_ADDR(2, 2, 2, 2);
    result = add_root_pipe_entry(pipe, distribution_pipe, src_ip_addr, status, distribution_entry);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to add entry - go to distribution pipe: %s", doca_error_get_descr(result));
        return result;
    }
 
    return DOCA_SUCCESS;
}
 
/*
 * Calculate the mask used to achieve given certain percentage.
 *
 * The function finds the nearest supported percentage which is not bigger than requested
 * percentage and calculates mask for it.
 * The supported percentages are: [50, 25, 12.5, ... , 0.0015258789].
 *
 * @percentage [in]: the certain percentage user wish to get in sampling.
 * @return: value to use in match_mask.parser_meta.random field for getting this percentage.
 */
static uint16_t get_random_mask(double percentage)
{
    double next_highest_supported_percentage = 50;
    uint16_t mask;
    uint8_t i;
 
    for (i = 1; i <= RANDOM_WIDTH; ++i) {
        if (percentage >= next_highest_supported_percentage)
            break;
 
        next_highest_supported_percentage /= 2;
    }
 
    if (percentage > next_highest_supported_percentage)
        DOCA_LOG_WARN("Requested %g%% is not supported, converted to %g%% instead",
                  percentage,
                  next_highest_supported_percentage);
 
    mask = (1 << i) - 1;
    DOCA_LOG_DBG("Get random mask 0x%04x for sampling %g%% of traffic", mask, next_highest_supported_percentage);
 
    return mask;
}
 
/*
 * Add DOCA Flow pipe for sampling according to random value
 *
 * @port [in]: port of the pipe
 * @port_id [in]: port ID of the pipe
 * @percentage [in]: the certain percentage user wish to get in sampling
 * @pipe [out]: created pipe pointer
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t create_random_sampling_pipe(struct doca_flow_port *port,
                        int port_id,
                        double percentage,
                        struct doca_flow_pipe **pipe)
{
    struct doca_flow_match match;
    struct doca_flow_match match_mask;
    struct doca_flow_monitor monitor;
    struct doca_flow_fwd fwd;
    struct doca_flow_pipe_cfg *pipe_cfg;
    doca_error_t result;
 
    memset(&match, 0, sizeof(match));
    memset(&match_mask, 0, sizeof(match_mask));
    memset(&monitor, 0, sizeof(monitor));
    memset(&fwd, 0, sizeof(fwd));
 
    /* Calculate the mask according to requested percentage */
    match_mask.parser_meta.random = DOCA_HTOBE16(get_random_mask(percentage));
    /*
     * Specific value 0, 0 is valid value for any supported percentage.
     */
    match.parser_meta.random = 0;
 
    /* Add counter to see how many packet are sampled */
    monitor.counter_type = DOCA_FLOW_RESOURCE_TYPE_NON_SHARED;
 
    result = doca_flow_pipe_cfg_create(&pipe_cfg, port);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to create doca_flow_pipe_cfg: %s", doca_error_get_descr(result));
        return result;
    }
 
    result = set_flow_pipe_cfg(pipe_cfg, "SAMPLING_PIPE", DOCA_FLOW_PIPE_BASIC, false);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_nr_entries(pipe_cfg, 1);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg nr_entries: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_match(pipe_cfg, &match, &match_mask);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg match: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_monitor(pipe_cfg, &monitor);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg monitor: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
 
    fwd.type = DOCA_FLOW_FWD_PORT;
    fwd.port_id = port_id ^ 1;
 
    result = doca_flow_pipe_create(pipe_cfg, &fwd, NULL, pipe);
destroy_pipe_cfg:
    doca_flow_pipe_cfg_destroy(pipe_cfg);
    return result;
}
 
/*
 * Add DOCA Flow pipe entry to the random sampling pipe.
 *
 * @pipe [in]: pipe of the entries
 * @status [in]: user context for adding entry
 * @entry [out]: created entry pointer.
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t add_random_sampling_pipe_entry(struct doca_flow_pipe *pipe,
                           struct entries_status *status,
                           struct doca_flow_pipe_entry **entry)
{
    struct doca_flow_match match;
 
    memset(&match, 0, sizeof(match));
 
    /*
     * The values for both fwd and match structures was provided as specific in pipe creation,
     * no need to provide fresh information here again.
     */
 
    return doca_flow_pipe_add_entry(0, pipe, &match, NULL, NULL, NULL, 0, status, entry);
}
 
/*
 * Add DOCA Flow hash pipe for distribution according to random value.
 *
 * @port [in]: port of the pipe
 * @nb_flows [in]: number of entries for this pipe.
 * @pipe [out]: created pipe pointer
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t create_random_distribution_pipe(struct doca_flow_port *port,
                            int nb_flows,
                            struct doca_flow_pipe **pipe)
{
    struct doca_flow_match match_mask;
    struct doca_flow_fwd fwd;
    uint16_t rss_queues = 0;
    struct doca_flow_pipe_cfg *pipe_cfg;
    doca_error_t result;
 
    memset(&match_mask, 0, sizeof(match_mask));
    memset(&fwd, 0, sizeof(fwd));
 
    /* The distribution is determined by number of entries, we can use full mask */
    match_mask.parser_meta.random = DOCA_HTOBE16(UINT16_MAX);
 
    result = doca_flow_pipe_cfg_create(&pipe_cfg, port);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to create doca_flow_pipe_cfg: %s", doca_error_get_descr(result));
        return result;
    }
 
    result = set_flow_pipe_cfg(pipe_cfg, "DISTRIBUTION_PIPE", DOCA_FLOW_PIPE_HASH, false);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_nr_entries(pipe_cfg, nb_flows);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg nr_entries: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
    result = doca_flow_pipe_cfg_set_match(pipe_cfg, NULL, &match_mask);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to set doca_flow_pipe_cfg match: %s", doca_error_get_descr(result));
        goto destroy_pipe_cfg;
    }
 
    fwd.type = DOCA_FLOW_FWD_RSS;
    fwd.rss_type = DOCA_FLOW_RESOURCE_TYPE_NON_SHARED;
    fwd.rss.queues_array = &rss_queues;
    fwd.rss.nr_queues = UINT32_MAX;
 
    result = doca_flow_pipe_create(pipe_cfg, &fwd, NULL, pipe);
destroy_pipe_cfg:
    doca_flow_pipe_cfg_destroy(pipe_cfg);
    return result;
}
 
/*
 * Add DOCA Flow pipe entries to the random distribution pipe.
 *
 * @pipe [in]: pipe of the entries.
 * @nb_entries [in]: number of entries to add.
 * @status [in]: user context for adding entry.
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t add_random_distribution_pipe_entries(struct doca_flow_pipe *pipe,
                             int nb_entries,
                             struct entries_status *status)
{
    enum doca_flow_flags_type flags = DOCA_FLOW_WAIT_FOR_BATCH;
    struct doca_flow_pipe_entry *entry;
    struct doca_flow_fwd fwd;
    doca_error_t result;
    uint16_t queue;
    uint16_t i;
 
    memset(&fwd, 0, sizeof(fwd));
 
    fwd.type = DOCA_FLOW_FWD_RSS;
    fwd.rss_type = DOCA_FLOW_RESOURCE_TYPE_NON_SHARED;
    fwd.rss.queues_array = &queue;
    fwd.rss.nr_queues = 1;
 
    for (i = 0; i < nb_entries; i++) {
        queue = i;
 
        if (i == nb_entries - 1)
            flags = DOCA_FLOW_NO_WAIT;
 
        result = doca_flow_pipe_hash_add_entry(0, pipe, i, NULL, NULL, &fwd, flags, status, &entry);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to add hash pipe entry %u: %s", i, doca_error_get_descr(result));
            return result;
        }
    }
 
    return DOCA_SUCCESS;
}
 
/*
 * Get results about certain percentage sampling.
 *
 * @port_id [in]: port id.
 * @root_entry [in]: entry sent packets to sampling.
 * @random_entry [in]: entry samples certain percentage of traffic.
 * @requested_percentage [in]: the certain percentage user wished to get in sampling.
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t random_sampling_results(uint16_t port_id,
                        struct doca_flow_pipe_entry *root_entry,
                        struct doca_flow_pipe_entry *random_entry,
                        double requested_percentage)
{
    struct doca_flow_resource_query root_query_stats;
    struct doca_flow_resource_query random_query_stats;
    double actuall_percentage;
    uint32_t total_packets;
    uint32_t nb_packets;
    doca_error_t result;
 
    result = doca_flow_resource_query_entry(root_entry, &root_query_stats);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to query root entry: %s", doca_error_get_descr(result));
        return result;
    }
 
    total_packets = root_query_stats.counter.total_pkts;
    if (total_packets == 0)
        return DOCA_SUCCESS;
 
    result = doca_flow_resource_query_entry(random_entry, &random_query_stats);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to query random entry: %s", doca_error_get_descr(result));
        return result;
    }
 
    nb_packets = random_query_stats.counter.total_pkts;
    actuall_percentage = GET_PERCENTAGE(nb_packets, total_packets);
 
    DOCA_LOG_INFO("Port %d sampling information (%g%% is requested):", port_id, requested_percentage);
    DOCA_LOG_INFO("This pipeline samples %u packets which is %g%% of the traffic (%u/%u)",
              nb_packets,
              actuall_percentage,
              nb_packets,
              total_packets);
 
    return DOCA_SUCCESS;
}
 
/*
 * Dequeue packets from DPDK queues and calculates the distribution.
 *
 * @port_id [in]: port id for dequeue packets.
 * @nb_queues [in]: number of Rx queues.
 * @root_entry [in]: entry sent packets before distribution.
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
static doca_error_t random_distribution_results(uint16_t port_id,
                        uint16_t nb_queues,
                        struct doca_flow_pipe_entry *root_entry)
{
    struct rte_mbuf *packets[PACKET_BURST];
    struct doca_flow_resource_query root_query_stats;
    double actuall_percentage, total_percentage = 0;
    uint32_t total_packets, total_dist_packets = 0;
    uint16_t nb_packets, nb_hit_queues = 0;
    doca_error_t result;
    int i;
 
    result = doca_flow_resource_query_entry(root_entry, &root_query_stats);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to query root entry in port %u: %s", port_id, doca_error_get_descr(result));
        return result;
    }
 
    total_packets = root_query_stats.counter.total_pkts;
    if (total_packets == 0)
        return DOCA_SUCCESS;
 
    DOCA_LOG_INFO("Port %d distribution information:", port_id);
 
    for (i = 0; i < nb_queues; i++) {
        nb_packets = rte_eth_rx_burst(port_id, i, packets, PACKET_BURST);
        actuall_percentage = GET_PERCENTAGE(nb_packets, total_packets);
        total_dist_packets += nb_packets;
        total_percentage += actuall_percentage;
        nb_hit_queues += nb_packets ? 1 : 0;
 
        DOCA_LOG_INFO("Queue %u received %u packets which is %g%% of the traffic (%u/%u)",
                  i,
                  nb_packets,
                  actuall_percentage,
                  nb_packets,
                  total_packets);
    }
 
    DOCA_LOG_INFO("The distribution pipe received %u packets which is %g%% of the traffic (%u/%u)",
              total_dist_packets,
              total_percentage,
              total_dist_packets,
              total_packets);
 
    if (nb_hit_queues > 1) {
        DOCA_LOG_INFO("Traffic is distributed on multiple queues");
    }
 
    return DOCA_SUCCESS;
}
 
/*
 * Run flow_random sample.
 *
 * This sample tests the 2 common use-cases of random matching:
 *  1. Sampling certain percentage of traffic.
 *  2. Random distribution over port/queues.
 *
 * @nb_steering_queues [in]: number of steering queues the sample will use
 * @nb_rss_queues [in]: number of rss queues the sample will use
 * @return: DOCA_SUCCESS on success and DOCA_ERROR otherwise.
 */
doca_error_t flow_random(int nb_steering_queues, int nb_rss_queues)
{
    int nb_ports = 2;
    struct flow_resources resource = {0};
    uint32_t nr_shared_resources[SHARED_RESOURCE_NUM_VALUES] = {0};
    struct doca_flow_port *ports[nb_ports];
    struct doca_dev *dev_arr[nb_ports];
    uint32_t actions_mem_size[nb_ports];
    struct doca_flow_pipe *root_pipe;
    struct doca_flow_pipe *sampling_pipe;
    struct doca_flow_pipe *distribution_pipe;
    struct doca_flow_pipe_entry *root2sampling_entry[nb_ports];
    struct doca_flow_pipe_entry *root2distribution_entry[nb_ports];
    struct doca_flow_pipe_entry *random_entry[nb_ports];
    struct entries_status status;
    double requested_percentage = 12.5;
    uint32_t num_of_entries = 3 + nb_rss_queues;
    doca_error_t result;
    int port_id;
 
    memset(&status, 0, sizeof(status));
    resource.nr_counters = num_of_entries;
 
    result = init_doca_flow(nb_steering_queues, "vnf,hws", &resource, nr_shared_resources);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to init DOCA Flow: %s", doca_error_get_descr(result));
        return result;
    }
 
    memset(dev_arr, 0, sizeof(struct doca_dev *) * nb_ports);
    ARRAY_INIT(actions_mem_size, ACTIONS_MEM_SIZE(nb_steering_queues, num_of_entries));
    result = init_doca_flow_ports(nb_ports, ports, true, dev_arr, actions_mem_size);
    if (result != DOCA_SUCCESS) {
        DOCA_LOG_ERR("Failed to init DOCA ports: %s", doca_error_get_descr(result));
        doca_flow_destroy();
        return result;
    }
 
    for (port_id = 0; port_id < nb_ports; port_id++) {
        memset(&status, 0, sizeof(status));
 
        result = create_random_distribution_pipe(ports[port_id], nb_rss_queues, &distribution_pipe);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to create random distribution pipe: %s", doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        result = add_random_distribution_pipe_entries(distribution_pipe, nb_rss_queues, &status);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to add random distribution pipe entries: %s",
                     doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        result = create_random_sampling_pipe(ports[port_id], port_id, requested_percentage, &sampling_pipe);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to create random sampling pipe: %s", doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        result = add_random_sampling_pipe_entry(sampling_pipe, &status, &random_entry[port_id]);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to add random sampling pipe entry: %s", doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        result = create_root_pipe(ports[port_id], &root_pipe);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to create root pipe: %s", doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        result = add_root_pipe_entries(root_pipe,
                           &status,
                           distribution_pipe,
                           sampling_pipe,
                           &root2distribution_entry[port_id],
                           &root2sampling_entry[port_id]);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to add root pipe entries: %s", doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        result = flow_process_entries(ports[port_id], &status, num_of_entries);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to process entries: %s", doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
    }
 
    DOCA_LOG_INFO("Wait few seconds for packets to arrive");
    sleep(15);
 
    for (port_id = 0; port_id < nb_ports; port_id++) {
        /* Show the results for sampling */
        result = random_sampling_results(port_id,
                         root2sampling_entry[port_id],
                         random_entry[port_id],
                         requested_percentage);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to show sampling results in port %u: %s",
                     port_id,
                     doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
 
        /* Show the results for distribution */
        result = random_distribution_results(port_id, nb_rss_queues, root2distribution_entry[port_id]);
        if (result != DOCA_SUCCESS) {
            DOCA_LOG_ERR("Failed to show distribution results in port %u: %s",
                     port_id,
                     doca_error_get_descr(result));
            stop_doca_flow_ports(nb_ports, ports);
            doca_flow_destroy();
            return result;
        }
    }
 
    result = stop_doca_flow_ports(nb_ports, ports);
    doca_flow_destroy();
    return result;
}