最简单的dpdk udp程序

 

记录一下测试dpdk udp收发的程序，程序很简单，从网卡收到ipv4 udp包后，将udp包回传给源。

1. export 两个dpdk环境变量
   export RTE_SDK=/root/dpdk-19.11
   export RTE_TARGET=x86_64-native-linuxapp-gcc
2. 设置好环境（安装驱动/大页/配置端口）
   可参考dpdk个人学习使用全过程_地上一个猴的博客-优快云博客_dpdk教程
3. 参考其他示例的makefile，写一个                                                  
4. 写代码（send.c），编译

   #include <stdio.h>
   #include <arpa/inet.h>
   #include <rte_eal.h>
   #include <rte_ethdev.h>
   #include <rte_mbuf.h>
   
   #define NUM_MBUFS		(4096-1)
   #define MBUFS_SIZE		32
   #define ENABLE_SEND		1
   
   uint16_t port_id = 0;
   
   
   
   #if ENABLE_SEND
   
   static uint32_t gSrcIp; 
   static uint32_t gDstIp;
   
   static uint8_t gSrcMac[RTE_ETHER_ADDR_LEN];
   static uint8_t gDstMac[RTE_ETHER_ADDR_LEN];
   
   static uint16_t gSrcPort;
   static uint16_t gDstPort;
   
   #endif
   
   
   
   static const struct rte_eth_conf port_conf_default = {
   	.rxmode = {.max_rx_pkt_len = RTE_ETHER_MAX_LEN }
   };
   
   static void init_port(struct rte_mempool *mbufpool)
   {
   	/*Get the number of ports which are usable for the application.*/
   	uint16_t sys_port = rte_eth_dev_count_avail();
   	if(sys_port == 0){
   		rte_exit(EXIT_FAILURE, "Not available eth\n");
   	}
   
   	/*Get ethernet information*/
   	struct rte_eth_dev_info dev_info;
   	rte_eth_dev_info_get(port_id, &dev_info);
   
   	/*Configure an Ethernet device*/
   	uint16_t nb_rx_q = 1;
   	uint16_t nb_tx_q = 1;
   	struct rte_eth_conf dev_conf = port_conf_default;
   	rte_eth_dev_configure(port_id, nb_rx_q, nb_tx_q, &dev_conf);
   
   	/*Allocate and set up a receive queue for an Ethernet device*/
   	uint16_t rx_queue_id = nb_rx_q - 1;
   	unsigned int socket_id = rte_eth_dev_socket_id(port_id);
   	if(rte_eth_rx_queue_setup(port_id, rx_queue_id, 1024, socket_id, NULL, mbufpool) < 0)
   		rte_exit(EXIT_FAILURE, "Receive queue error\n");
   		
   #if ENABLE_SEND
   	/*Allocate and set up a transmit queue for an Ethernet device*/
   	struct rte_eth_txconf txq_conf = dev_info.default_txconf;
   	txq_conf.offloads = dev_conf.rxmode.offloads;
   	if (rte_eth_tx_queue_setup(port_id, 0 , 1024, socket_id, &txq_conf) < 0)
   		rte_exit(EXIT_FAILURE, "Could not setup TX queue\n");
   
   #endif
   
   	/*Start an Ethernet device*/
   	if(rte_eth_dev_start(port_id) < 0)
   		rte_exit(EXIT_FAILURE, "Start ethernet error\n");
   
   }
   
   
   
   int main(int argc, char **argv)
   {
       unsigned int i =0;
       //uint8_t   au8SendMsg[] = "hello misss";
       
   	/*init*/
   	if(rte_eal_init(argc, argv) < 0)
   		rte_exit(EXIT_FAILURE, "EAL init Error\n");
   
   	/*create a mbuf pool*/
   	struct rte_mempool *mbufpool = rte_pktmbuf_pool_create("mbufpool", NUM_MBUFS, 0, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
   	if(mbufpool == NULL)
   		rte_exit(EXIT_FAILURE, "Create mbufpool Error\n");
   
   	/*init port*/
   	init_port(mbufpool);
   
   
       rte_eth_macaddr_get(port_id, (struct rte_ether_addr *)gSrcMac);
   
   	while(1){
   		struct rte_mbuf *rx_pkts[MBUFS_SIZE];
   		/*Retrieve a burst of input packets from a receive queue of an Ethernet device*/
   		unsigned num_recv = rte_eth_rx_burst(port_id, 0, rx_pkts, MBUFS_SIZE);
   		if(num_recv > MBUFS_SIZE)
   			rte_exit(EXIT_FAILURE, "Receive from eth error\n");
   
   		for(i = 0; i < num_recv; i++){
               
   			struct rte_ether_hdr *ehdr  = rte_pktmbuf_mtod(rx_pkts[i], struct rte_ether_hdr*);
   			if (ehdr->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV4)) {
   				rte_pktmbuf_free(rx_pkts[i]);
   				continue;
   			}
   			
   			struct rte_ipv4_hdr *iphdr =  rte_pktmbuf_mtod_offset(rx_pkts[i], struct rte_ipv4_hdr *, sizeof(struct rte_ether_hdr));
   			if (iphdr->next_proto_id == IPPROTO_UDP) {
   				/*IPPROTO_UDP is defined in kernel source code include/uapi/inux/in.h*/
   
   				struct rte_udp_hdr *udphdr = (struct rte_udp_hdr *)(iphdr + 1);
   
   #if ENABLE_SEND
   
   				//rte_eth_macaddr_get(port_id, (struct rte_ether_addr *)gSrcMac);
   				rte_memcpy(gDstMac, ehdr->s_addr.addr_bytes, RTE_ETHER_ADDR_LEN);
   								
   				rte_memcpy(&gSrcIp, &iphdr->dst_addr, sizeof(uint32_t));
   				rte_memcpy(&gDstIp, &iphdr->src_addr, sizeof(uint32_t));
                   
   				rte_memcpy(&gSrcPort, &udphdr->dst_port, sizeof(uint16_t));
   				rte_memcpy(&gDstPort, &udphdr->src_port, sizeof(uint16_t));
   			
   #endif
   
   				uint16_t length = ntohs(udphdr->dgram_len);
   				*((char*)udphdr + length) = '\0';
   
   				struct in_addr addr;
   				addr.s_addr = iphdr->src_addr;
   				printf("<- src: %s:%d, ", inet_ntoa(addr), udphdr->src_port);
   				addr.s_addr = iphdr->dst_addr;
   				printf("dst: %s:%d, %s\n", inet_ntoa(addr), udphdr->dst_port, (char *)(udphdr+1));
   				
   #if ENABLE_SEND
                   //20220926add
                   rte_memcpy(&iphdr->src_addr, &gSrcIp, sizeof(uint32_t));
                   rte_memcpy(&iphdr->dst_addr, &gDstIp, sizeof(uint32_t));
                   addr.s_addr = iphdr->src_addr;
   				printf("-> src: %s:%d, ", inet_ntoa(addr), udphdr->src_port);
   				addr.s_addr = iphdr->dst_addr;
   				printf("dst: %s:%d, %s\n", inet_ntoa(addr), udphdr->dst_port, (char *)(udphdr+1));
   
                   rte_memcpy(ehdr->s_addr.addr_bytes, gSrcMac, RTE_ETHER_ADDR_LEN);
                   rte_memcpy(ehdr->d_addr.addr_bytes, gDstMac, RTE_ETHER_ADDR_LEN);
                   
   				//调测增加，实际使用可去掉端口限制
                   if (4369 == udphdr->src_port)
                   {
       				rte_eth_tx_burst(port_id , 0, rx_pkts, num_recv);
     								
                   }
   #endif
   				rte_pktmbuf_free(rx_pkts[i]);
   			}
   		}
   	}
   }
   
   

   

    

5. Windows本地添加静态地址
   运行管理员cmd，其中ip地址为自定义，不与局域网冲突即可，mac地址必须正确，是配置给dpdk的网卡地址。
   netsh -c i i add neighbors 12  "10.180.147.55" "00-0c-29-88-c1-9a"
6. 打开网络调试助手网络调试助手下载_网络调试助手绿色版免费下载-华军软件园
   填写正确的本地ip，连接后填写刚才添加的目标主机地址
   
7. windows发送消息到dpdk，udp将消息传回windows
   

 

 文章参考：[4].dpdk实现udp协议发送数据_u.意思的博客-优快云博客_dpdk udp