DPVS 问题排查抓包方法

1.转发（复制）报文到kni网卡

处理数据包函数 lcore_process_packets中设备只要设置了NETIF_PORT_FLAG_FORWARD2KNI标志

可以将4层转发流量拷贝一份转发到对应设备的kni口 通过tcpdump抓包分析

    /*
     * In NETIF_PORT_FLAG_FORWARD2KNI mode.
     * All packets received are deep copied and sent to  KNI
     * for the purpose of capturing forwarding packets.Since the
     * rte_mbuf will be modified in the following procedure,
     * we should use mbuf_copy instead of rte_pktmbuf_clone.
     */
    if (dev->flag & NETIF_PORT_FLAG_FORWARD2KNI) {
        if (likely(NULL != (mbuf_copied = mbuf_copy(mbuf,
                            pktmbuf_pool[dev->socket]))))
            kni_ingress(mbuf_copied, dev, qconf);
        else
            RTE_LOG(WARNING, NETIF, "%s: Failed to copy mbuf\n",
                    __func__);
    }

通过命令设置bond0转发标志

#dpip link set bond0 forward2kni on

访问VIP并抓包

抓包内容