使用dpdk rte_hash表的一个例子，要求存储内容为IP和MAC地址，key为IP，提供查找函数，插入函数，遍历函数，用c这几个函数-DPDK中文网

下面是一个使用DPDK的rte_hash表来存储IP和MAC地址的例子，包括插入、查找和遍历函数：

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <rte_hash.h>
#define MAX_ENTRIES 1024
struct entry {
    uint32_t ip;
    uint8_t mac[6];
};
static struct rte_hash *hash_table;
// 初始化hash表
void init_hash_table() {
    struct rte_hash_parameters hash_params = {
        .name = "ip_mac_table",
        .entries = MAX_ENTRIES,
        .key_len = sizeof(uint32_t),
        .hash_func_init_val = 0,
        .socket_id = SOCKET_ID_ANY,
    };
    hash_table = rte_hash_create(&hash_params);
    if (hash_table == NULL) {
        printf("Failed to create hash table\n");
        return;
    }
}
// 插入一条记录到hash表中
void insert_entry(uint32_t ip, const uint8_t *mac) {
    struct entry new_entry;
    memset(&new_entry, 0, sizeof(struct entry));
    new_entry.ip = ip;
    memcpy(new_entry.mac, mac, 6);
    int ret = rte_hash_add_key_data(hash_table, &ip, &new_entry);
    
    if (ret < 0)
      printf("Failed to insert entry into hash table\n");
}
// 根据IP查找对应的MAC地址
uint8_t* find_mac_by_ip(uint32_t ip) {
    void *data;
    
    int ret = rte_hash_lookup_data(hash_table, &ip, &data);
    
    if (ret >= 0)
      return ((struct entry*)data)->mac;
      
     return NULL; 
}
// 遍历hash表中的所有记录
void iterate_entries() {
    uint32_t next_key = 0;
    void *data;
    while (rte_hash_iterate(hash_table, &next_key, &data) >= 0) {
        struct entry *entry = (struct entry*)data;
        printf("IP: %u.%u.%u.%u, MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
               (entry->ip >> 24) & 0xFF, (entry->ip >> 16) & 0xFF,
               (entry->ip >> 8) & 0xFF, entry->ip & 0xFF,
               entry->mac[0], entry->mac[1], entry->mac[2],
               entry->mac[3], entry->mac[4], entry->mac[5]);
    }
}
int main() {
    init_hash_table();
    
    // 插入示例数据
    uint32_t ip1 = rte_cpu_to_be_32(0xC0A80101); // IP地址为192.168.1.1
    uint8_t mac1[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55};
    
    insert_entry(ip1, mac1);
    
    // 查找MAC地址
    uint8_t *found_mac = find_mac_by_ip(ip1);
    
    if (found_mac != NULL) {
        printf("Found MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
               found_mac[0], found_mac[1], found_mac[2],
               found_mac[3], found_mac[4], found_mac[5]);
    } else {
        printf("MAC not found for IP: %u.%u.%u.%u\n",
               (ip1 >> 24) & 0xFF, (ip1 >> 16) & 0xFF,
               (ip1 >> 8) & 0xFF, ip1 & 0xFF);
    }
    
    // 遍历所有记录
    iterate_entries();
    
    return 0;
}