examples/flow_filtering/snippets/snippet_random_match.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright (c) 2022 NVIDIA Corporation & Affiliates
 */
 
#include <stdlib.h>
#include <rte_flow.h>
 
#include "../common.h"
#include "snippet_random_match.h"
 
 
static void
snippet_init_random_match(void)
{
    init_default_snippet();
}
 
static void
snippet_match_random_value_create_actions(__rte_unused uint16_t port_id,
                    struct rte_flow_action *action)
{
    struct rte_flow_action_queue *queue = calloc(1, sizeof(struct rte_flow_action_queue));
    if (queue == NULL) {
        fprintf(stderr, "Failed to allocate memory for queue\n");
        return;
    }
    queue->index = UINT16_MAX; /* The selected target queue.*/
    action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
    action[0].conf = queue;
    action[1].type = RTE_FLOW_ACTION_TYPE_END;
}
 
static void
snippet_match_random_value_create_patterns(struct rte_flow_item *pattern)
{
    struct rte_flow_item_random *random_item;
    random_item = calloc(1, sizeof(struct rte_flow_item_random));
    if (random_item == NULL) {
        fprintf(stderr, "Failed to allocate memory for port_representor_spec\n");
        return;
    }
 
    random_item->value = 0;
 
    /* Set the patterns. */
    pattern[0].type = RTE_FLOW_ITEM_TYPE_RANDOM;
    pattern[0].spec = random_item;
    pattern[1].type = RTE_FLOW_ITEM_TYPE_ETH;
    pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
}
 
static struct rte_flow_pattern_template *
snippet_match_random_value_create_pattern_template(uint16_t port_id, struct rte_flow_error *error)
{
 
    struct rte_flow_item_random random_item = {
        .value = 0x3,
    };
 
    /* Define the flow pattern template. */
    struct rte_flow_item pattern[] = {
        {
            .type = RTE_FLOW_ITEM_TYPE_RANDOM,
            .mask = &random_item,
        },
        {
            .type = RTE_FLOW_ITEM_TYPE_ETH,
        },
        {
            .type = RTE_FLOW_ITEM_TYPE_END,
        },
    };
 
    /* Set the pattern template attributes */
    const struct rte_flow_pattern_template_attr pt_attr = {
        .relaxed_matching = 0,
        .ingress = 1,
    };
 
    return rte_flow_pattern_template_create(port_id, &pt_attr, pattern, error);
}
 
static struct rte_flow_actions_template *
snippet_match_random_value_create_actions_template(__rte_unused uint16_t port_id,
                         struct rte_flow_error *error)
{
    struct rte_flow_action_queue queue_v = {
        .index = 0
    };
 
    struct rte_flow_action_queue queue_m = {
        .index = UINT16_MAX
    };
 
    /* Define the actions template. */
    struct rte_flow_action actions[] = {
        {
            .type = RTE_FLOW_ACTION_TYPE_QUEUE,
            .conf = &queue_v,
        },
        {
            .type = RTE_FLOW_ACTION_TYPE_END,
        },
    };
 
    /* Define the actions template masks. */
    struct rte_flow_action masks[] = {
        {
            .type = RTE_FLOW_ACTION_TYPE_QUEUE,
            .conf = &queue_m,
        },
        {
            .type = RTE_FLOW_ACTION_TYPE_END,
        },
    };
 
    const struct rte_flow_actions_template_attr at_attr = {
        .ingress = 1,
    };
 
    return rte_flow_actions_template_create(port_id, &at_attr, actions, masks, error);
}
 
static struct rte_flow_template_table *
snippet_match_random_value_create_table(uint16_t port_id, struct rte_flow_error *error)
{
    struct rte_flow_pattern_template *pt;
    struct rte_flow_actions_template *at;
 
    /* Define the template table attributes. */
    const struct rte_flow_template_table_attr tbl_attr = {
        .flow_attr = {
            .group = 1,
            .priority = 0,
            .ingress = 1,
        },
 
        /* set the maximum number of flow rules that this table holds. */
        .nb_flows = 1,
    };
 
    /* Create the pattern template. */
    pt = snippet_match_random_value_create_pattern_template(port_id, error);
    if (pt == NULL) {
        printf("Failed to create pattern template: %s (%s)\n",
                error->message, rte_strerror(rte_errno));
        return NULL;
    }
 
    /* Create the actions template. */
    at = snippet_match_random_value_create_actions_template(port_id, error);
    if (at == NULL) {
        printf("Failed to create actions template: %s (%s)\n",
                error->message, rte_strerror(rte_errno));
        return NULL;
    }
 
    /* Create the template table. */
    return rte_flow_template_table_create(port_id, &tbl_attr, &pt, 1, &at, 1, error);
}