dpdk使用fdir的c代码案例-DPDK中文网

下面是一个简单的 DPDK 使用 FDIR（流定义和路由）功能的 C 代码示例。这段代码展示了如何设置 FDIR 规则并处理流量。请确保在实际使用之前根据你的具体环境进行适当的配置和测试。

首先，确保你已经正确安装并配置了 DPDK，并且你的环境支持 FDIR 功能。

示例代码

#include <stdio.h>
#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_ip.h>
#include <rte_ether.h>

#define RTE_ETH_DEV_COUNT 1

static void setup_fdir(struct rte_eth_dev_info *dev_info, uint16_t port_id) {
    struct rte_eth_fdir *fdir;
    struct rte_eth_fdir_config fdir_conf;

    // Check if the device supports FDIR
    if (!(dev_info->flow_type_rss_offloads & RTE_FLOWS_SUPPORTED)) {
        printf("The device does not support flow director\n");
        return;
    }

    // Initialize flow director
    memset(&fdir_conf, 0, sizeof(fdir_conf));
    
    fdir_conf.mode = RTE_FDIR_MODE_PERFECT;  // Set to perfect matching mode
    fdir_conf.packets = 1024;                // Number of packets to handle in FDIR
    
    int ret = rte_eth_dev_fdir_set(port_id, &fdir_conf);
    if (ret != 0) {
        printf("Failed to set FDIR configuration: %d\n", ret);
        return;
    }
    
    // Add a sample rule for IPv4 traffic on specific ports
    struct rte_flow_item_ipv4 ipv4_spec = { .hdr = { .dst_addr = htonl(0xC0A80001), /* Destination IP */ } };
    struct rte_flow_item_ipv4 ipv4_mask = { .hdr = { .dst_addr = htonl(0xFFFFFFFF) } };

    struct rte_flow_attr attr;
    memset(&attr, 0, sizeof(attr));
    
    attr.ingress = 1;      // Ingress rule
    
    struct rte_flow_item items[] = {
        {RTE_FLOW_ITEM_TYPE_IPV4, &ipv4_spec, &ipv4_mask},
        {RTE_FLOW_ITEM_TYPE_END}
    };
    
   struct rte_flow_action actions[] = {
        {.type= RTE_FLOW_ACTION_TYPE_QUEUE, {.queue_id=0}}, 
        {RTE_FLOW_ACTION_TYPE_END}
   };

   // Create the flow with the specified attributes and items/actions.
   struct rte_flow_error error;
   const struct rte_flow *flow = rte_flow_create(port_id, &attr, items, actions, &error);
   
   if (!flow) {
       printf("Error creating flow: %s\n", error.message ? error.message : "unknown");
   } else {
       printf("FDIR rule added successfully.\n");
   }
}

int main(int argc, char **argv) {
     int ret;
     ret = rte_eal_init(argc, argv);
     if (ret < 0) {
         rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
     }
     
     uint16_t port_id;
     for (port_id = 0; port_id < RTE_ETH_DEV_COUNT; port_id++) {
         struct rte_eth_dev_info dev_info;

         rte_eth_dev_info_get(port_id, &dev_info);
         setup_fdir(&dev_info, port_id); 
     }

     return 0;
}