dpdk发送arp 请求消息，c实现-DPDK中文网

以下是使用DPDK框架发送ARP请求消息的C代码示例：

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdbool.h>
#include <netinet/in.h>
#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_arp.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 }
};

static struct rte_mempool *mbuf_pool = NULL;

static void send_arp_request(struct rte_mbuf *pkt_out, uint16_t dst_port_id,
                             struct ether_addr *src_mac_addr,
                             struct ether_addr *dst_mac_addr,
                             uint32_t src_ip_addr, uint32_t dst_ip_addr)
{
    struct ether_hdr *eth_hdr;
    struct arp_hdr *arp_hdr;
    struct rte_arp_ipv4 *arp_data;

    // Initialize Ethernet header
    eth_hdr = rte_pktmbuf_mtod(pkt_out, struct ether_hdr *);
    ether_addr_copy(src_mac_addr, &eth_hdr->s_addr);
    ether_addr_copy(dst_mac_addr, &eth_hdr->d_addr);
    eth_hdr->ether_type = htons(ETHER_TYPE_ARP);

    // Initialize ARP header
    arp_hdr = (struct arp_hdr *)(eth_hdr + 1);
    arp_hdr->arp_hrd = htons(ARP_HRD_ETHER);
    arp_hdr->arp_pro = htons(ETHER_TYPE_IPv4);
    arp_hdr->arp_hln = sizeof(struct ether_addr);
    arp_hdr->arp_pln = sizeof(uint32_t);
    arp_hdr->arp_op = htons(ARP_OP_REQUEST);

    // Initialize ARP data
    arp_data = (struct rte_arp_ipv4 *)(arp_hdr + 1);
    ether_addr_copy(src_mac_addr, &arp_data->arp_sha);
    arp_data->arp_sip = src_ip_addr;
    ether_addr_copy(dst_mac_addr, &arp_data->arp_tha);
    arp_data->arp_tip = dst_ip_addr;

    // Send packet
    int sent = rte_eth_tx_burst(dst_port_id, 0, &pkt_out, 1);
    if (sent < 1) {
        rte_pktmbuf_free(pkt_out);
    }
}

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

    // Initialize DPDK EAL
    ret = rte_eal_init(argc, argv);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error initializing DPDK EAL\n");
    }

    // Create memory pool for mbufs
    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, "Error creating mbuf pool\n");
    }

    // Configure and initialize one port
    uint16_t nb_ports = rte_eth_dev_count_avail();
    if (nb_ports < 1) {
        rte_exit(EXIT_FAILURE, "Error: no Ethernet ports found\n");
    }
    uint16_t port_id = 0;
    struct rte_eth_conf port_conf = port_conf_default;
    ret = rte_eth_dev_configure(port_id, 1, 1, &port_conf);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error configuring Ethernet port\n");
    }
    ret = rte_eth_rx_queue_setup(port_id, 0, RX_RING_SIZE,
                                  rte_eth_dev_socket_id(port_id),
                                  NULL,
                                  mbuf_pool);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error setting up RX queue\n");
    }
    ret = rte_eth_tx_queue_setup(port_id, 0, TX_RING_SIZE,
                                  rte_eth_dev_socket_id(port_id),
                                  NULL);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error setting up TX queue\n");
    }
    ret = rte_eth_dev_start(port_id);
    if (ret < 0) {
        rte_exit(EXIT_FAILURE, "Error starting Ethernet port\n");
    }

    // Get source MAC address
    struct ether_addr src_mac_addr;
    rte_eth_macaddr_get(port_id, &src_mac_addr);

    // Build ARP request packet
    uint32_t src_ip_addr = IPv4(192, 168, 1, 2);
    uint32_t dst_ip_addr = IPv4(192, 168, 1, 1);
    struct rte_mbuf *pkt_out = rte_pktmbuf_alloc(mbuf_pool);
    if (pkt_out == NULL) {
        rte_exit(EXIT_FAILURE, "Error allocating mbuf\n");
    }
    send_arp_request(pkt_out, port_id, &src_mac_addr, &ether_broadcast,
                     src_ip_addr, dst_ip_addr);

    return 0;
}

在此示例中，我们首先初始化DPDK环境并创建一个内存池用于存储mbuf。然后，我们配置和初始化一个网络端口，并获取其源MAC地址。接下来，我们构建一个ARP请求消息并使用DPDK的rte_eth_tx_burst函数发送它。最后，我们释放该mbuf并退出程序。

请注意，此示例仅发送一个ARP请求消息。在实际应用中，您可能需要创建一个消息队列来处理多个请求，并使用DPDK的rte_eth_tx_burst函数批量发送它们。