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;
}
请注意,这个例子假设你已经正确地配置了DPDK环境,并包含了相关的头文件和库。
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