请给出dpdk发送巨型帧的代码-DPDK中文网

好的，以下是使用DPDK发送巨型帧的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <rte_eal.h>
#include <rte_mbuf.h>
#include <rte_ethdev.h>
#include <rte_cycles.h>

#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024

#define NUM_MBUFS 8191
#define MBUF_CACHE_SIZE 250
#define BURST_SIZE 32

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;
    struct rte_mempool *mbuf_pool;
    struct rte_eth_dev_info dev_info;
    struct rte_eth_txconf txconf;

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

    argc -= ret;
    argv += ret;

    /* 获取网口数量 */
    nb_ports = rte_eth_dev_count_avail();

    /* 创建内存池 */
    mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS,
        MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
    
   /* 配置端口并启动 */
   for (portid = 0; portid < nb_ports; portid++) {
        if (!rte_eth_dev_is_valid_port(portid))
            continue;

        /* 获取网卡信息 */
        memset(&dev_info, 0, sizeof(dev_info));
        rte_eth_dev_info_get(portid, &dev_info);

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

        /* 配置 TX 函数 */
        memset(&txconf, 0, sizeof(txconf));
        txconf.txq_flags = ETH_TXQ_FLAGS_NOOFFLOADS;

        /* 启动端口 */
        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: err=%d,"
                " port=%u\n", ret, portid);

       ret = rte_eth_rx_queue_setup(portid, 0, RX_RING_SIZE,
            rte_eth_dev_socket_id(portid), NULL, mbuf_pool);
       if (ret < 0)
           rte_exit(EXIT_FAILURE,
               "rte_eth_rx_queue_setup:err=%d,port=%u\n",
               ret,(unsigned) portid);
    
       /* 启动设备 */
       ret = rte_eth_dev_start(portid);
       if (ret < 0)
           rte_exit(EXIT_FAILURE,
               "rte_eth_dev_start:err=%d,port=%u\n",
               ret,(unsigned)portid);

       printf("Ethernet device %u successfully configured.\n", portid);
    }

    /* 创建一个 MBUF 包 */
    struct rte_mbuf *pkt[BURST_SIZE];
    for (int i = 0; i < BURST_SIZE; i++) {
        pkt[i] = rte_pktmbuf_alloc(mbuf_pool); // 从内存池中获取一个 MBUF 包
        if (pkt[i] == NULL)
            rte_exit(EXIT_FAILURE, "Cannot allocate mbuf\n");

        /* 设置包头 */
        pkt[i]->data_len = ETHER_MAX_LEN; // 数据长度为最大以太网帧长度
        pkt[i]->pkt_len = ETHER_MAX_LEN;
    }

    /* 发送 MBUF 包 */
    uint64_t tx_time = 0;
    int nb_tx = rte_eth_tx_burst(0, 0, pkt, BURST_SIZE);
    if (nb_tx < BURST_SIZE) {
        for (int i = nb_tx; i < BURST_SIZE; i++)
            rte_pktmbuf_free(pkt[i]); // 释放未发送的 MBUF 包
    } else {
        /* 等待一段时间，直到数据发送完毕 */
        do {
            nb_tx = rte_eth_tx_done_cleanup(0, BURST_SIZE);
            tx_time += rte_get_timer_cycles();
            rte_delay_us(5);
        } while (nb_tx);

       printf("TX time: %lu cycles\n", tx_time / BURST_SIZE); 
   }

   return 0;
}

以上代码创建了一个内存池和一个网口，并使用DPDK发送了32个巨型帧。需要注意的是，这只是基本示例代码，实际应用中可能需要更加复杂的逻辑来处理巨型帧。