dpdk收发报文的代码-DPDK中文网

好的，以下是一个简单的DPDK收发报文的代码示例：

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include <rte_eal.h>
#include <rte_ethdev.h>

#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024
#define NUM_MBUFS 8191
#define MBUF_CACHE_SIZE 250

static const struct rte_eth_conf port_conf_default = {
    .rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN }
};

int main(int argc, char *argv[]) {
    int ret;
    uint16_t nb_ports;
    uint16_t portid;

    // 初始化 DPDK 环境
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");

    // 获取网卡端口数量
    nb_ports = rte_eth_dev_count_avail();
    if (nb_ports == 0)
        rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");

    // 配置每个网卡端口，并启动它们
    for (portid = 0; portid < nb_ports; portid++) {
        struct rte_eth_dev_info dev_info;
        struct rte_eth_txconf txconf;
        struct rte_eth_rxconf rxconf;
        struct rte_mempool *mbuf_pool;

        // 获取当前网卡端口信息并打印
        memset(&dev_info, 0, sizeof(dev_info));
        rte_eth_dev_info_get(portid, &dev_info);
        printf("Port %u: %s\n", portid, dev_info.driver_name);

        // 分配用于存储数据包的内存池
        mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS,
            MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
            rte_socket_id());
        if (mbuf_pool == NULL)
            rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");

        // 配置网卡端口
        ret = rte_eth_dev_configure(portid, 1, 1, &port_conf_default);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Cannot configure port %u\n", portid);

        // 分配和配置 RX 队列和 TX 队列
        ret = rte_eth_rx_queue_setup(portid, 0, RX_RING_SIZE,
            rte_eth_dev_socket_id(portid), &rxconf, mbuf_pool);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Cannot setup RX queue for port %u\n",
                portid);

        memset(&txconf, 0, sizeof(txconf));
        txconf.txq_flags = ETH_TXQ_FLAGS_IGNORE;
        ret = rte_eth_tx_queue_setup(portid, 0, TX_RING_SIZE,
            rte_eth_dev_socket_id(portid), &txconf);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Cannot setup TX queue for port %u\n",
                portid);

        // 启动网卡端口
        ret = rte_eth_dev_start(portid);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "Cannot start port %u\n", portid);

        // 开启混杂模式（promiscuous mode），接收所有数据包
        ret = rte_eth_promiscuous_enable(portid);
    }

    printf("\nDPDK initialized successfully\n");

    // 死循环，不断接收和发送数据包
    while (1) {
        struct rte_mbuf *bufs[BURST_SIZE];
        int nb_rx;

        for (portid = 0; portid < nb_ports; portid++) {
            // 接收数据包
            nb_rx = rte_eth_rx_burst(portid, 0, bufs, BURST_SIZE);
            if (nb_rx > 0) {
                // 处理接收到的数据包
                printf("Received %d packets on port %u\n", nb_rx, portid);

                // 发送数据包
                uint16_t i;
                for (i = 0; i < nb_rx; i++)
                    rte_pktmbuf_free(bufs[i]);
            }
        }
    }

    return 0;
}

这个代码示例使用DPDK库来初始化网卡端口、分配内存池、配置 RX/TX