以下是一个简单的示例代码，用于使用DPDK中的hash表来存储TCP重组流，并实现超时流检测队列：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <unistd.h>
#include <rte_hash.h>
#include <rte_jhash.h>

#define MAX_FLOW_TIMEOUT 60           // 60秒超时时间
#define FLOW_POLL_INTERVAL 1          // 流轮询间隔，1秒
#define FLOW_TABLE_SIZE 1024 * 1024   // 流表大小

// 定义流缓存结构体
typedef struct flow {
    uint32_t src_ip;
    uint16_t src_port;
    uint32_t dst_ip;
    uint16_t dst_port;
    uint32_t seq;
    uint32_t ack;
    uint8_t * payload;      // TCP负载
    uint16_t payload_len;   // TCP负载长度
    time_t last_active;     // 最后活跃时间
} flow_t;

// 定义流哈希表结构体
typedef struct flow_table {
    struct rte_hash * hash;     // DPDK哈希表
    flow_t ** flows;            // 流数据缓存数组
    size_t max_flows;           // 最大允许的流数
    size_t num_flows;           // 当前流数量
} flow_table_t;

// 初始化流哈希表
flow_table_t * flow_table_init(size_t max_flows)
{
    // 初始化哈希表
    struct rte_hash_parameters hash_params = {
        .name = "flow_table",
        .entries = FLOW_TABLE_SIZE,
        .key_len = sizeof(uint64_t),
        .hash_func = rte_jhash,
        .hash_func_init_val = 0,
    };

    struct rte_hash * hash = rte_hash_create(&hash_params);

    if (!hash) {
        printf("Error creating flow table hash.\n");
        return NULL;
    }

    // 初始化流缓存数组
    flow_t ** flows = (flow_t **) calloc(max_flows, sizeof(flow_t *));

    if (!flows) {
        printf("Error allocating memory for flow cache.\n");
        rte_hash_free(hash);
        return NULL;
    }

    flow_table_t * flow_table = (flow_table_t *) malloc(sizeof(flow_table_t));
    flow_table->hash = hash;
    flow_table->flows = flows;
    flow_table->max_flows = max_flows;
    flow_table->num_flows = 0;

    return flow_table;
}

// 创建新的流对象
flow_t * flow_create(uint32_t src_ip, uint16_t src_port, uint32_t dst_ip, uint16_t dst_port, uint32_t seq, uint32_t ack, uint8_t * payload, uint16_t payload_len)
{
    flow_t * flow = (flow_t *) malloc(sizeof(flow_t));

    if (!flow) {
        printf("Error allocating memory for new flow.\n");
        return NULL;
    }

    flow->src_ip = src_ip;
    flow->src_port = src_port;
    flow->dst_ip = dst_ip;
    flow->dst_port = dst_port;
    flow->seq = seq;
    flow->ack = ack;
    flow->payload = payload;
    flow->payload_len = payload_len;
    flow->last_active = time(NULL);

    return flow;
}

// 将流对象添加到流哈希表中
bool flow_table_add(flow_table_t * flow_table, uint32_t src_ip, uint16_t src_port, uint32_t dst_ip, uint16_t dst_port, uint32_t seq, uint32_t ack, uint8_t * payload, uint16_t payload_len)
{
    // 检查是否已达到最大允许的流数
    if (flow_table->num_flows == flow_table->max_flows) {
        printf("Maximum number of flows reached.\n");
        return false;
    }

    // 创建新的流对象
    flow_t * flow = flow_create(src_ip, src_port, dst_ip, dst_port, seq, ack, payload, payload_len);

    if (!flow) {
        printf("Error creating new flow.\n");
        return false;
    }

    // 将流对象加入哈希表
    uint64_t flow_key = ((uint64_t) src_ip << 32) | dst_ip;

    int ret = rte_hash_add_key_data(flow_table->hash, &flow_key, flow);

    if (ret < 0) {
        printf("Error adding flow to hash table: %s\n", rte_strerror(abs(ret)));
        free(flow);
        return false;
    }

    // 将流对象加入缓存数组
    flow_table->flows[flow_table->num_flows++] = flow;

    return true;
}

// 获取指定流的对象
flow_t * flow_table_lookup(flow_table_t * flow_table, uint32_t src_ip, uint16_t src_port, uint32_t dst_ip, uint16_t dst_port)
{
    uint64_t flow_key = ((uint64_t) src_ip << 32) | dst_ip;

    flow_t * flow;

    int ret = rte_hash_lookup_data(flow_table->hash, &flow_key, (void **) &flow);

    if (ret < 0) {
        return NULL;
    }

    return flow;
}

// 从流哈希表中删除指定的流对象
bool flow_table_remove(flow_table_t * flow_table, uint32_t src_ip, uint16_t src_port, uint32_t dst_ip, uint16_t dst_port)
{
    uint64_t flow_key = ((uint64_t) src_ip << 32) | dst_ip;

    // 从哈希表中删除流对象
    int ret = rte_hash_del_key(flow_table->hash, &flow_key);

    if (ret < 0) {
        printf("Error removing flow from hash table: %s\n", rte_strerror(abs(ret)));
        return false;
    }

    // 从缓存数组中删除流对象
    int i;

    for (i = 0; i < flow_table->num_flows; i++) {
        if (flow_table->flows[i]->src_ip == src_ip && flow_table->flows[i]->dst_ip == dst_ip) {
            free(flow_table->flows[i]);
            break;
        }
    }

    if (i == flow_table->num_flows) {
        printf("Flow not found in cache.\n");
        return false;
    }

    flow_table->flows[i] = flow_table->flows[--flow_table->num_flows];

    return true;
}

// 流超时检测函数
void flow_timeout_check(flow_table_t * flow_table)
{
    time_t current_time = time(NULL);
    size_t i;

    for (i = 0; i < flow_table->num_flows; i++) {
        if (current_time - flow_table->flows[i]->last_active > MAX_FLOW_TIMEOUT) {
            printf("Flow timed out.\n");
            flow_table_remove(flow_table, flow_table->flows[i]->src_ip, flow_table->flows[i]->src_port, flow_table->flows[i]->dst_ip, flow_table->flows[i]->dst_port);
        }
    }
}

// 流轮询函数
void flow_polling(flow_table_t * flow_table)
{
    while (true) {
        sleep(FLOW_POLL_INTERVAL);
        flow_timeout_check(flow_table);
    }
}

int main(int argc, char **argv)
{
    flow_table_t * flow_table = flow_table_init(1024);

    // 在此处添加代码以将TCP重组流添加到哈希表中

    // 创建流轮询线程
    pthread_t flow_poll_thread;
    pthread_create(&flow_poll_thread, NULL, (void *) flow_polling, flow_table);

    // 在此处添加代码以处理TCP重组流

    return 0;
}