用DPDK发送10个长度依次递增的报文代码-DPDK中文网

下面是一个用 DPDK 发送 10 个长度依次递增的报文的示例代码：

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

#define NUM_PACKETS 10

int main(int argc, char *argv[]) {
    int ret;
    uint16_t port_id = 0; // 网口 ID，假设为 0
    uint16_t queue_id = 0; // 队列 ID，假设为 0
    struct rte_mempool *mbuf_pool;
    
    // 初始化 EAL
    ret = rte_eal_init(argc, argv);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error: Failed to initialize EAL.\n");
    }
    
    // 创建内存池，用于分配 mbuf 结构体
    mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_PACKETS*2,
                                        RTE_CACHE_LINE_SIZE, 0,
                                        RTE_MBUF_DEFAULT_BUF_SIZE,
                                        rte_socket_id());
    if (mbuf_pool == NULL) {
        rte_exit(EXIT_FAILURE, "Error: Failed to create mbuf pool.\n");
    }
    
    // 配置网口
    ret = rte_eth_dev_configure(port_id, 1, 1, NULL);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error: Failed to configure Ethernet device.\n");
    }
    
    // 激活网口
    ret = rte_eth_dev_start(port_id);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error: Failed to start Ethernet device.\n");
   }

   // 构造并发送数据包
   struct ether_hdr *eth_hdr;
   struct rte_mbuf *mbuf;
   uint16_t data_len = 0;
   
   for (int i = 0; i < NUM_PACKETS; i++) {
       // 创建 mbuf 结构体
       mbuf = rte_pktmbuf_alloc(mbuf_pool);
       if (mbuf == NULL) {
           rte_exit(EXIT_FAILURE, "Error: Failed to allocate mbuf.\n");
       }
       
       // 设置以太网头部
       eth_hdr = rte_pktmbuf_mtod(mbuf, struct ether_hdr *);
       memset(eth_hdr->d_addr.addr_bytes, 0xFF, ETHER_ADDR_LEN); // 目的地址为广播地址
       memset(eth_hdr->s_addr.addr_bytes, 0x00, ETHER_ADDR_LEN); // 源地址为全零地址
       eth_hdr->ether_type = htons(ETHER_TYPE_IPv4); // 假设使用 IPv4 协议

       // 设置数据长度并复制数据到 mbuf 中
       data_len += i + 1; // 数据长度递增
       char *data = (char *)rte_pktmbuf_append(mbuf, data_len);
       memset(data, 'A' + i, data_len); // 将数据填充成 A~J 的字符序列

       mbuf->pkt_len = RTE_BE16(data_len + sizeof(struct ether_hdr));
       mbuf->data_len = RTE_BE16(data_len);

      ret = rte_eth_tx_burst(port_id, queue_id, &mbuf, 1);
      if (ret != 1) {
          printf("Warning: Failed to send packet %d.\n", i+1);
      } else {
          printf("Packet %d sent successfully.\n", i+1);
      }
   }

   rte_eth_dev_stop(port_id); // 停止网口
   rte_eth_dev_close(port_id); // 关闭网口
   return 0;
}

在这个示例代码中，首先使用 DPDK 初始化 EAL，并创建一个大小为 NUM_PACKETS*2 的内存池。然后，配置并激活网口，构造数据包并递增数据长度发送。注意，在构造数据包时需要设置以太网头部和 pkt_len 和 data_len 字段。

每个数据包的有效载荷都是逐渐增加的，从 A 一直到 J。输出结果类似于：

Packet 1 sent successfully.
Packet 2 sent successfully.
Packet 3 sent successfully.
Packet 4 sent successfully.
Packet 5 sent successfully.
Packet 6 sent successfully.
Packet 7 sent successfully.
Packet 8 sent successfully.
Packet 9 sent successfully.
Packet 10 sent successfully.