dpdk 代码-DPDK中文网

DPDK是一个开源的数据平面开发工具包，用于加速Linux应用程序和虚拟化功能。以下是DPDK的一些常见代码示例：

初始化DPDK环境

int ret;
ret = rte_eal_init(argc, argv);
if (ret < 0)
    rte_panic("Cannot init EAL\n");

创建并配置DPDK网卡

struct rte_eth_conf port_conf = {
    .rxmode = {
        .max_rx_pkt_len = RTE_ETHER_MAX_LEN,
        .split_hdr_size = 0,
        .offloads = DEV_RX_OFFLOAD_CRC_STRIP,
    },
    .txmode = {
        .mq_mode = ETH_MQ_TX_NONE,
    },
};

uint16_t nb_ports = rte_eth_dev_count_avail();

for (portid = 0; portid < nb_ports; portid++) {
    if (!rte_eth_dev_is_valid_port(portid))
        continue;

    ret = rte_eth_dev_configure(portid, 1, 1, &port_conf);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Cannot configure device: err=%d, port=%u\n", ret, portid);

    rte_eth_macaddr_get(portid, &ports_eth_addr[portid]);

    /* Enable RX in promiscuous mode for the Ethernet device. */
    rte_eth_promiscuous_enable(portid);

    /* Display the port MAC address. */
    printf("Port %u MAC: %02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 ":%02" PRIx8 "\n",
            (unsigned)portid,
            ports_eth_addr[portid].addr_bytes[0], ports_eth_addr[portid].addr_bytes[1],
            ports_eth_addr[portid].addr_bytes[2], ports_eth_addr[portid].addr_bytes[3],
            ports_eth_addr[portid].addr_bytes[4], ports_eth_addr[portid].addr_bytes[5]);
}

接收和发送网络数据包

/* Wait for packets on RX port */
nb_rx = rte_eth_rx_burst(portid, 0, pkts_burst, MAX_PKT_BURST);

/* Send packets on TX port */
sent = rte_eth_tx_burst(portid ^ 1, 0, pkts_burst, nb_rx);

处理数据包

struct rte_mbuf *pkt;
void *pkt_data;

while ((pkt = rte_pktmbuf_alloc(pktmbuf_pool)) != NULL) {
    pkt_data = rte_pktmbuf_append(pkt, PKT_SIZE);
    if (pkt_data == NULL)
        break;

    /* Fill packet with random data */
    srand(time(NULL));
    for (i = 0; i < PKT_SIZE; i++)
        pkt_data[i] = rand();

    /* Send packet out */
    ret = rte_eth_tx_burst(portid, 0, &pkt, 1);
    if (ret < 1) {
        rte_pktmbuf_free(pkt);
    }
}

这些示例代码仅代表DPDK的一部分功能。完整的DPDK源代码可以在其官方网站上找到。