examples/flow_filtering/main.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2017 Mellanox Technologies, Ltd
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <setjmp.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdbool.h>
 
#include <rte_eal.h>
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_net.h>
#include <rte_flow.h>
#include <rte_cycles.h>
 
static volatile bool force_quit;
 
static uint16_t port_id;
static uint16_t nr_queues = 5;
static uint8_t selected_queue = 1;
struct rte_mempool *mbuf_pool;
struct rte_flow *flow;
 
#define SRC_IP ((0<<24) + (0<<16) + (0<<8) + 0) /* src ip = 0.0.0.0 */
#define DEST_IP ((192<<24) + (168<<16) + (1<<8) + 1) /* dest ip = 192.168.1.1 */
#define FULL_MASK 0xffffffff /* full mask */
#define EMPTY_MASK 0x0 /* empty mask */
 
#include "flow_blocks.c"
 
static inline void
print_ether_addr(const char *what, struct rte_ether_addr *eth_addr)
{
    char buf[RTE_ETHER_ADDR_FMT_SIZE];
    rte_ether_format_addr(buf, RTE_ETHER_ADDR_FMT_SIZE, eth_addr);
    printf("%s%s", what, buf);
}
 
/* Main_loop for flow filtering. 8< */
static int
main_loop(void)
{
    struct rte_mbuf *mbufs[32];
    struct rte_ether_hdr *eth_hdr;
    struct rte_flow_error error;
    uint16_t nb_rx;
    uint16_t i;
    uint16_t j;
    int ret;
 
    /* Reading the packets from all queues. 8< */
    while (!force_quit) {
        for (i = 0; i < nr_queues; i++) {
            nb_rx = rte_eth_rx_burst(port_id,
                        i, mbufs, 32);
            if (nb_rx) {
                for (j = 0; j < nb_rx; j++) {
                    struct rte_mbuf *m = mbufs[j];
 
                    eth_hdr = rte_pktmbuf_mtod(m,
                            struct rte_ether_hdr *);
                    print_ether_addr("src=",
                            &eth_hdr->src_addr);
                    print_ether_addr(" - dst=",
                            &eth_hdr->dst_addr);
                    printf(" - queue=0x%x",
                            (unsigned int)i);
                    printf("\n");
 
                    rte_pktmbuf_free(m);
                }
            }
        }
    }
    /* >8 End of reading the packets from all queues. */
 
    /* closing and releasing resources */
    rte_flow_flush(port_id, &error);
    ret = rte_eth_dev_stop(port_id);
    if (ret < 0)
        printf("Failed to stop port %u: %s",
               port_id, rte_strerror(-ret));
    rte_eth_dev_close(port_id);
    return ret;
}
/* >8 End of main_loop for flow filtering. */
 
#define CHECK_INTERVAL 1000  /* 100ms */
#define MAX_REPEAT_TIMES 90  /* 9s (90 * 100ms) in total */
 
static void
assert_link_status(void)
{
    struct rte_eth_link link;
    uint8_t rep_cnt = MAX_REPEAT_TIMES;
    int link_get_err = -EINVAL;
 
    memset(&link, 0, sizeof(link));
    do {
        link_get_err = rte_eth_link_get(port_id, &link);
        if (link_get_err == 0 && link.link_status == RTE_ETH_LINK_UP)
            break;
        rte_delay_ms(CHECK_INTERVAL);
    } while (--rep_cnt);
 
    if (link_get_err < 0)
        rte_exit(EXIT_FAILURE, ":: error: link get is failing: %s\n",
             rte_strerror(-link_get_err));
    if (link.link_status == RTE_ETH_LINK_DOWN)
        rte_exit(EXIT_FAILURE, ":: error: link is still down\n");
}
 
/* Port initialization used in flow filtering. 8< */
static void
init_port(void)
{
    int ret;
    uint16_t i;
    /* Ethernet port configured with default settings. 8< */
    struct rte_eth_conf port_conf = {
        .txmode = {
            .offloads =
                RTE_ETH_TX_OFFLOAD_VLAN_INSERT |
                RTE_ETH_TX_OFFLOAD_IPV4_CKSUM  |
                RTE_ETH_TX_OFFLOAD_UDP_CKSUM   |
                RTE_ETH_TX_OFFLOAD_TCP_CKSUM   |
                RTE_ETH_TX_OFFLOAD_SCTP_CKSUM  |
                RTE_ETH_TX_OFFLOAD_TCP_TSO,
        },
    };
    struct rte_eth_txconf txq_conf;
    struct rte_eth_rxconf rxq_conf;
    struct rte_eth_dev_info dev_info;
 
    ret = rte_eth_dev_info_get(port_id, &dev_info);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,
            "Error during getting device (port %u) info: %s\n",
            port_id, strerror(-ret));
 
    port_conf.txmode.offloads &= dev_info.tx_offload_capa;
    printf(":: initializing port: %d\n", port_id);
    ret = rte_eth_dev_configure(port_id,
                nr_queues, nr_queues, &port_conf);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE,
            ":: cannot configure device: err=%d, port=%u\n",
            ret, port_id);
    }
 
    rxq_conf = dev_info.default_rxconf;
    rxq_conf.offloads = port_conf.rxmode.offloads;
    /* >8 End of ethernet port configured with default settings. */
 
    /* Configuring number of RX and TX queues connected to single port. 8< */
    for (i = 0; i < nr_queues; i++) {
        ret = rte_eth_rx_queue_setup(port_id, i, 512,
                     rte_eth_dev_socket_id(port_id),
                     &rxq_conf,
                     mbuf_pool);
        if (ret < 0) {
            rte_exit(EXIT_FAILURE,
                ":: Rx queue setup failed: err=%d, port=%u\n",
                ret, port_id);
        }
    }
 
    txq_conf = dev_info.default_txconf;
    txq_conf.offloads = port_conf.txmode.offloads;
 
    for (i = 0; i < nr_queues; i++) {
        ret = rte_eth_tx_queue_setup(port_id, i, 512,
                rte_eth_dev_socket_id(port_id),
                &txq_conf);
        if (ret < 0) {
            rte_exit(EXIT_FAILURE,
                ":: Tx queue setup failed: err=%d, port=%u\n",
                ret, port_id);
        }
    }
    /* >8 End of Configuring RX and TX queues connected to single port. */
 
    /* Setting the RX port to promiscuous mode. 8< */
    ret = rte_eth_promiscuous_enable(port_id);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,
            ":: promiscuous mode enable failed: err=%s, port=%u\n",
            rte_strerror(-ret), port_id);
    /* >8 End of setting the RX port to promiscuous mode. */
 
    /* Starting the port. 8< */
    ret = rte_eth_dev_start(port_id);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE,
            "rte_eth_dev_start:err=%d, port=%u\n",
            ret, port_id);
    }
    /* >8 End of starting the port. */
 
    assert_link_status();
 
    printf(":: initializing port: %d done\n", port_id);
}
/* >8 End of Port initialization used in flow filtering. */
 
static void
signal_handler(int signum)
{
    if (signum == SIGINT || signum == SIGTERM) {
        printf("\n\nSignal %d received, preparing to exit...\n",
                signum);
        force_quit = true;
    }
}
 
int
main(int argc, char **argv)
{
    int ret;
    uint16_t nr_ports;
    struct rte_flow_error error;
 
    /* Initialize EAL. 8< */
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, ":: invalid EAL arguments\n");
    /* >8 End of Initialization of EAL. */
 
    force_quit = false;
    signal(SIGINT, signal_handler);
    signal(SIGTERM, signal_handler);
 
    nr_ports = rte_eth_dev_count_avail();
    if (nr_ports == 0)
        rte_exit(EXIT_FAILURE, ":: no Ethernet ports found\n");
    port_id = 0;
    if (nr_ports != 1) {
        printf(":: warn: %d ports detected, but we use only one: port %u\n",
            nr_ports, port_id);
    }
    /* Allocates a mempool to hold the mbufs. 8< */
    mbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", 4096, 128, 0,
                        RTE_MBUF_DEFAULT_BUF_SIZE,
                        rte_socket_id());
    /* >8 End of allocating a mempool to hold the mbufs. */
    if (mbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
 
    /* Initializes all the ports using the user defined init_port(). 8< */
    init_port();
    /* >8 End of Initializing the ports using user defined init_port(). */
 
    /* Create flow for send packet with. 8< */
    flow = generate_ipv4_flow(port_id, selected_queue,
                SRC_IP, EMPTY_MASK,
                DEST_IP, FULL_MASK, &error);
    /* >8 End of create flow and the flow rule. */
    if (!flow) {
        printf("Flow can't be created %d message: %s\n",
            error.type,
            error.message ? error.message : "(no stated reason)");
        rte_exit(EXIT_FAILURE, "error in creating flow");
    }
    /* >8 End of creating flow for send packet with. */
 
    /* Launching main_loop(). 8< */
    ret = main_loop();
    /* >8 End of launching main_loop(). */
 
    /* clean up the EAL */
    rte_eal_cleanup();
 
    return ret;
}