以下是使用 DPDK 发送 TCP 报文的示例代码：

#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <rte_eal.h>
#include <rte_ethdev.h>

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

// 定义报文结构体
struct tx_packet {
    struct ether_hdr ether;
    struct ipv4_hdr ip;
    struct tcp_hdr tcp;
    char data[64];
} __attribute__((__packed__));

int main(int argc, char **argv)
{
    int ret;

    // 初始化 DPDK 环境
    ret = rte_eal_init(argc, argv);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Failed to initialize DPDK environment\n");
    }

    // 获取第一个以太网设备的端口号
    uint16_t port_id = rte_eth_find_next_owned_by(0, RTE_ETH_DEV_NO_OWNER);

    // 初始化以太网设备并设置参数
    struct rte_eth_conf port_conf = {
        .rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN }
        .txmode = { .mq_mode = ETH_MQ_TX_NONE }
        .rx_adv_conf.rss_conf.rss_key = NULL,
        .rx_adv_conf.rss_conf.rss_hf = ETH_RSS_IP | ETH_RSS_TCP,
        .tx_adv_conf.txq_flags = ETH_TXQ_FLAGS_IGNORE_REQUESTED_ITRS |
                                 ETH_TXQ_FLAGS_NOMULTSEGS |
                                 ETH_TXQ_FLAGS_NOVLANOFFL |
                                 ETH_TXQ_FLAGS_NOXSUMSCTP |
                                 ETH_TXQ_FLAGS_NOREFCOUNT,
    };
    ret = rte_eth_dev_configure(port_id, 1, 1, &port_conf);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Failed to configure Ethernet device\n");
    }

    // 分配内存池和 Mbuf
    struct rte_mempool *mbuf_pool;
    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, "Failed to create memory pool for Mbufs\n");
    }
    struct rte_mbuf *pkt = rte_pktmbuf_alloc(mbuf_pool);
    if (pkt == NULL) {
        rte_exit(EXIT_FAILURE, "Failed to allocate Mbuf\n");
    }

    // 初始化报文结构体
    struct tx_packet *tx_pkt = (struct tx_packet *) pkt->buf_addr;
    
     // 设置以太网头部信息
     uint8_t dest_mac[6] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55};
     uint8_t src_mac[6] = {0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb};
     tx_pkt->ether.d_addr.addr_bytes = dest_mac;
     tx_pkt->ether.s_addr.addr_bytes = src_mac;
     tx_pkt->ether.ether_type = htons(ETHER_TYPE_IPv4);

     // 设置 IPv4 头部信息
     tx_pkt->ip.version_ihl = IP_VHL_DEF;
     tx_pkt->ip.type_of_service = IPTOS_LOWDELAY;
     tx_pkt->ip.total_length = htons(sizeof(struct ipv4_hdr) +
                                      sizeof(struct tcp_hdr) + 64);
     tx_pkt->ip.packet_id = htons(1);
     tx_pkt->ip.fragment_offset = htons(IPv4_HDR_DF_FLAG | IPv4_HDR_MF_FLAG);
     tx_pkt->ip.time_to_live = IP_DEFTTL;
     tx_pkt->ip.next_proto_id = IPPROTO_TCP;
     tx_pkt->ip.hdr_checksum = 0;
     uint32_t src_ip = inet_addr("192.168.0.1");
     uint32_t dest_ip = inet_addr("192.168.0.2");
     tx_pkt->ip.src_addr = rte_cpu_to_be_32(src_ip);
     tx_pkt->ip.dst_addr = rte_cpu_to_be_32(dest_ip);

    // 设置 TCP 头部信息
    uint16_t src_port = 12345;
    uint16_t dst_port = 80;
    tx_pkt->tcp.src_port = rte_cpu_to_be_16(src_port);
    tx_pkt->tcp.dst_port = rte_cpu_to_be_16(dst_port);
    tx_pkt->tcp.sent_seq = rte_cpu_to_be_32(1);
    tx_pkt->tcp.recv_ack = rte_cpu_to_be_32(1);
    tx_pkt->tcp.data_off =
        (sizeof(struct tcp_hdr) / sizeof(uint32_t)) << TCP_HLEN_SHIFT;

    // 设置数据内容
    strncpy(tx_pkt->data, "Hello, World!", strlen("Hello, World!"));

   // 发送数据报文
   ret = rte_eth_tx_burst(port_id, 0, &pkt, 1);

   if (ret < 0) {
       printf("Failed to send packet: %s\n", strerror(rte_errno));
   } else {
       printf("Packet sent successfully!\n");
   }

   return 0;
}

需要注意的是，上述代码只是简单的示例，实际应用中还需要处理异常情况和错误信息。同时，在发送数据报文之前需要根据具体需求设置以太网头部、IP 头部、TCP 头部等参数。