只有第一个 q_ipackets 统计信息在启用 RSS 的 DPDK 中返回非零数字

分类：编程问答

如何解决只有第一个 q_ipackets 统计信息在启用 RSS 的 DPDK 中返回非零数字

平台为 Ubuntu 20.04，带 intel 82599 网卡，使用 DPDK 20.08。下面是主要的演示代码。尽管每个虚拟线程都可以通过 rte_eth_rx_burst 获取数据包，但只有 q_ipackets[0] 可以返回非零数，这等于 ipackets。这是网卡不支持还是配置错误造成的？

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <string.h>
#include <sys/queue.h>
#include <stdarg.h>
#include <errno.h>
#include <getopt.h>
#include <unistd.h>
#include <signal.h>
#include <pthread.h>


#include <rte_common.h>
#include <rte_byteorder.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_memcpy.h>
#include <rte_eal.h>
#include <rte_launch.h>
#include <rte_atomic.h>
#include <rte_cycles.h>
#include <rte_prefetch.h>
#include <rte_lcore.h>
#include <rte_per_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_interrupts.h>
#include <rte_random.h>
#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_udp.h>
#include <rte_string_fns.h>
#include <rte_acl.h>
#include <rte_ring.h>
#include <rte_ethdev.h>
#include <rte_hash.h>
#include <rte_rwlock.h>
#include <rte_flow.h>
#include <rte_ring_elem.h>
#include <rte_bpf.h>
#include <rte_member.h>

#include "include/data_structure.h"
#include "include/utils.h"

#define DEFAULT_RX_PORT 0
#define DEFAULT_TX_PORT 1
#define RTE_TEST_RX_DESC_DEFAULT 4096
#define RTE_TEST_TX_DESC_DEFAULT 4096
#define NB_MBUF 1048576
#define MEMPOOL_CACHE_SIZE 256
#define BURST_SIZE 32

static struct rte_eth_conf port_conf = {
    .rxmode = {
        .mq_mode    = ETH_MQ_RX_RSS,.max_rx_pkt_len = RTE_ETHER_MAX_LEN,},.rx_adv_conf = {
        .rss_conf = {
            .rss_key = NULL,.rss_hf = ETH_RSS_IPV4 | ETH_RSS_NONFRAG_IPV4_TCP | ETH_RSS_NONFRAG_IPV4_UDP,.txmode = {
        .mq_mode = ETH_MQ_TX_NONE,};


static int
dummy_thread( void *args ){
    struct thread_args *t_args = (struct thread_args*)args;
    struct rte_mbuf *bufs[BURST_SIZE];
    uint32_t nb_deq = 0;
    
    printf("Entering thread...\n");
    printf("Port %u queue %u\n",t_args->portid,t_args->queueid);
    while(true){
        nb_deq = rte_eth_rx_burst(t_args->portid,t_args->queueid,bufs,BURST_SIZE);
        
        if(unlikely(nb_deq == 0))
            continue;

        do{
            rte_pktmbuf_free(bufs[--nb_deq]);
        }while (nb_deq > 0);

    }
}



int 
main(int argc,char **argv)
{
    int ret;
    ret = rte_eal_init(argc,argv);
    if(ret < 0)
        rte_exit(EXIT_FAILURE,"Invalid EAL parameters\n");
    argc -= ret;
    argv += ret;

    unsigned nb_ports = rte_eth_dev_count_avail();
    uint32_t nb_lcores = rte_lcore_count();
    uint16_t portid;
    uint8_t nb_rx_queue,nb_tx_queue;
    struct rte_eth_dev_info dev_info;
    struct rte_eth_conf local_port_conf = port_conf;
    portid = 0;
    ret = rte_eth_dev_info_get(portid,&dev_info);

    nb_rx_queue = 5;
    nb_tx_queue = 0;
    ret = rte_eth_dev_configure(portid,nb_rx_queue,nb_tx_queue,&local_port_conf);
    if (ret < 0)
        rte_exit(EXIT_FAILURE,"Cannot configure device: err=%d,port=%d\n",ret,portid);
    else
        printf("Configuring finished...\n");
    
    uint16_t nb_rxd = RTE_TEST_RX_DESC_DEFAULT;
    uint16_t nb_txd = RTE_TEST_TX_DESC_DEFAULT;
    ret = rte_eth_dev_adjust_nb_rx_tx_desc(portid,&nb_rxd,&nb_txd);
    if (ret < 0)
        rte_exit(EXIT_FAILURE,"rte_eth_dev_adjust_nb_rx_tx_desc: err=%d,portid);
    
    struct rte_mempool *pktmbuf_pool;
    pktmbuf_pool = rte_pktmbuf_pool_create("global_pktmbuf_pool",NB_MBUF,MEMPOOL_CACHE_SIZE,RTE_MBUF_DEFAULT_BUF_SIZE,rte_socket_id());
    if (pktmbuf_pool == NULL)
        rte_exit(EXIT_FAILURE,"Cannot init mbuf pool on socket %d\n",rte_socket_id());
    else
        printf("Allocated Succeeded...\n");

    for (uint8_t queue = 0; queue < nb_rx_queue; queue ++){
        struct rte_eth_rxconf rxq_conf;

        ret = rte_eth_dev_info_get(portid,&dev_info);
        if (ret != 0)
            rte_exit(EXIT_FAILURE,"Error during getting device (port %u) info: %s\n",portid,strerror(-ret));

        rxq_conf = dev_info.default_rxconf;
        rxq_conf.offloads = port_conf.rxmode.offloads;
        ret = rte_eth_rx_queue_setup(portid,queue,nb_rxd,rte_socket_id(),&rxq_conf,pktmbuf_pool);
        if (ret < 0)
            rte_exit(EXIT_FAILURE,"rte_eth_rx_queue_setup: err=%d,"
                "port=%d\n",portid);
    }

    struct thread_args *args = NULL;
    for (uint8_t queue = 0; queue < nb_rx_queue; queue ++){
        args = (struct thread_args*)malloc(sizeof(struct thread_args));
        args->logic_no = queue;
        args->portid = portid;
        args->queueid = queue;
        // rte_eal_remote_launch(thread,(void*)args,queue + 1);
        rte_eal_remote_launch(dummy_thread,queue + 1);
    }

    ret = rte_eth_promiscuous_enable(portid);
    if (ret != 0)
        rte_exit(EXIT_FAILURE,"rte_eth_promiscuous_enable: err=%s,port=%u\n",rte_strerror(-ret),portid);
    else
        printf("Enabled Promiscuous Mode...\n");
    
    if(ret == 0){
        printf("Succeeded...\n");
    }else{
        printf("failed...\n");
    }

    ret = rte_eth_dev_start(portid);
    if (ret < 0)
        rte_exit(EXIT_FAILURE,"rte_eth_dev_start: err=%d,portid);
    else
        printf("Starting port succeeded...\n");
    
    struct rte_eth_stats stats;
    while(true){
        sleep(2);
        rte_eth_stats_get(portid,&stats);
        printf("***************************************\n");
        for( unsigned long i = 0; i < nb_rx_queue; i++ ){
            printf("hardware port 0 queue %lu queue length: %d\n",i,rte_eth_rx_queue_count(0,i));
        }
        for( unsigned long i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS; i++ ){
            printf("hardware port 0 queue %lu queue received: %lu\n",stats.q_ipackets[i]);
        }
        printf("%lu\n",stats.ipackets);
        printf("%lu\n",stats.imissed);
    }

    rte_eal_mp_wait_lcore();
}

ps： 使用的流量由MoonGen产生，只包含udp包和l3信息为

啜饮：10.1.0.10 倾角：10.2.0.10 - 10.3.0.10 运动：1234 运动：319

ethtool 统计数据是

NIC statistics:
     rx_packets: 17029206
     tx_packets: 18
     rx_bytes: 5108761800
     tx_bytes: 1476
     rx_pkts_nic: 17029206
     tx_pkts_nic: 18
     rx_bytes_nic: 5178531776
     tx_bytes_nic: 1548
     lsc_int: 11
     tx_busy: 0
     non_eop_descs: 0
     rx_errors: 0
     tx_errors: 0
     rx_dropped: 0
     tx_dropped: 0
     multicast: 0
     broadcast: 0
     rx_no_buffer_count: 0
     collisions: 0
     rx_over_errors: 0
     rx_crc_errors: 0
     rx_frame_errors: 0
     hw_rsc_aggregated: 0
     hw_rsc_flushed: 0
     fdir_match: 0
     fdir_miss: 17045796
     fdir_overflow: 0
     rx_fifo_errors: 0
     rx_missed_errors: 5438
     tx_aborted_errors: 0
     tx_carrier_errors: 0
     tx_fifo_errors: 0
     tx_heartbeat_errors: 0
     tx_timeout_count: 0
     tx_restart_queue: 0
     rx_length_errors: 0
     rx_long_length_errors: 0
     rx_short_length_errors: 0
     tx_flow_control_xon: 2
     rx_flow_control_xon: 0
     tx_flow_control_xoff: 4
     rx_flow_control_xoff: 0
     rx_csum_offload_errors: 17028934
     alloc_rx_page: 32287
     alloc_rx_page_failed: 0
     alloc_rx_buff_failed: 0
     rx_no_dma_resources: 0
     os2bmc_rx_by_bmc: 0
     os2bmc_tx_by_bmc: 0
     os2bmc_tx_by_host: 0
     os2bmc_rx_by_host: 0
     tx_hwtstamp_timeouts: 0
     tx_hwtstamp_skipped: 0
     rx_hwtstamp_cleared: 0
     tx_ipsec: 0
     rx_ipsec: 0
     fcoe_bad_fccrc: 0
     rx_fcoe_dropped: 0
     rx_fcoe_packets: 0
     rx_fcoe_dwords: 0
     fcoe_noddp: 0
     fcoe_noddp_ext_buff: 0
     tx_fcoe_packets: 0
     tx_fcoe_dwords: 0
     tx_queue_0_packets: 0
     tx_queue_0_bytes: 0
     tx_queue_1_packets: 12
     tx_queue_1_bytes: 936
     tx_queue_2_packets: 0
     tx_queue_2_bytes: 0
     tx_queue_3_packets: 0
     tx_queue_3_bytes: 0
     tx_queue_4_packets: 0
     tx_queue_4_bytes: 0
     tx_queue_5_packets: 0
     tx_queue_5_bytes: 0
     tx_queue_6_packets: 0
     tx_queue_6_bytes: 0
     tx_queue_7_packets: 0
     tx_queue_7_bytes: 0
     tx_queue_8_packets: 0
     tx_queue_8_bytes: 0
     tx_queue_9_packets: 0
     tx_queue_9_bytes: 0
     tx_queue_10_packets: 0
     tx_queue_10_bytes: 0
     tx_queue_11_packets: 0
     tx_queue_11_bytes: 0
     tx_queue_12_packets: 0
     tx_queue_12_bytes: 0
     tx_queue_13_packets: 0
     tx_queue_13_bytes: 0
     tx_queue_14_packets: 0
     tx_queue_14_bytes: 0
     tx_queue_15_packets: 0
     tx_queue_15_bytes: 0
     tx_queue_16_packets: 0
     tx_queue_16_bytes: 0
     tx_queue_17_packets: 0
     tx_queue_17_bytes: 0
     tx_queue_18_packets: 0
     tx_queue_18_bytes: 0
     tx_queue_19_packets: 0
     tx_queue_19_bytes: 0
     tx_queue_20_packets: 0
     tx_queue_20_bytes: 0
     tx_queue_21_packets: 0
     tx_queue_21_bytes: 0
     tx_queue_22_packets: 0
     tx_queue_22_bytes: 0
     tx_queue_23_packets: 0
     tx_queue_23_bytes: 0
     tx_queue_24_packets: 0
     tx_queue_24_bytes: 0
     tx_queue_25_packets: 0
     tx_queue_25_bytes: 0
     tx_queue_26_packets: 0
     tx_queue_26_bytes: 0
     tx_queue_27_packets: 0
     tx_queue_27_bytes: 0
     tx_queue_28_packets: 0
     tx_queue_28_bytes: 0
     tx_queue_29_packets: 0
     tx_queue_29_bytes: 0
     tx_queue_30_packets: 0
     tx_queue_30_bytes: 0
     tx_queue_31_packets: 0
     tx_queue_31_bytes: 0
     tx_queue_32_packets: 0
     tx_queue_32_bytes: 0
     tx_queue_33_packets: 0
     tx_queue_33_bytes: 0
     tx_queue_34_packets: 0
     tx_queue_34_bytes: 0
     tx_queue_35_packets: 0
     tx_queue_35_bytes: 0
     tx_queue_36_packets: 0
     tx_queue_36_bytes: 0
     tx_queue_37_packets: 0
     tx_queue_37_bytes: 0
     tx_queue_38_packets: 0
     tx_queue_38_bytes: 0
     tx_queue_39_packets: 0
     tx_queue_39_bytes: 0
     tx_queue_40_packets: 0
     tx_queue_40_bytes: 0
     tx_queue_41_packets: 0
     tx_queue_41_bytes: 0
     tx_queue_42_packets: 0
     tx_queue_42_bytes: 0
     tx_queue_43_packets: 0
     tx_queue_43_bytes: 0
     tx_queue_44_packets: 0
     tx_queue_44_bytes: 0
     tx_queue_45_packets: 0
     tx_queue_45_bytes: 0
     tx_queue_46_packets: 0
     tx_queue_46_bytes: 0
     tx_queue_47_packets: 0
     tx_queue_47_bytes: 0
     tx_queue_48_packets: 0
     tx_queue_48_bytes: 0
     tx_queue_49_packets: 0
     tx_queue_49_bytes: 0
     tx_queue_50_packets: 0
     tx_queue_50_bytes: 0
     tx_queue_51_packets: 0
     tx_queue_51_bytes: 0
     tx_queue_52_packets: 0
     tx_queue_52_bytes: 0
     tx_queue_53_packets: 0
     tx_queue_53_bytes: 0
     tx_queue_54_packets: 0
     tx_queue_54_bytes: 0
     tx_queue_55_packets: 0
     tx_queue_55_bytes: 0
     tx_queue_56_packets: 0
     tx_queue_56_bytes: 0
     tx_queue_57_packets: 0
     tx_queue_57_bytes: 0
     tx_queue_58_packets: 0
     tx_queue_58_bytes: 0
     tx_queue_59_packets: 0
     tx_queue_59_bytes: 0
     tx_queue_60_packets: 0
     tx_queue_60_bytes: 0
     tx_queue_61_packets: 6
     tx_queue_61_bytes: 540
     tx_queue_62_packets: 0
     tx_queue_62_bytes: 0
     tx_queue_63_packets: 0
     tx_queue_63_bytes: 0
     rx_queue_0_packets: 1064316
     rx_queue_0_bytes: 319294800
     rx_queue_1_packets: 1064318
     rx_queue_1_bytes: 319295400
     rx_queue_2_packets: 1064328
     rx_queue_2_bytes: 319298400
     rx_queue_3_packets: 1064329
     rx_queue_3_bytes: 319298700
     rx_queue_4_packets: 1064326
     rx_queue_4_bytes: 319297800
     rx_queue_5_packets: 1064328
     rx_queue_5_bytes: 319298400
     rx_queue_6_packets: 1064330
     rx_queue_6_bytes: 319299000
     rx_queue_7_packets: 1064327
     rx_queue_7_bytes: 319298100
     rx_queue_8_packets: 1064316
     rx_queue_8_bytes: 319294800
     rx_queue_9_packets: 1064317
     rx_queue_9_bytes: 319295100
     rx_queue_10_packets: 1064329
     rx_queue_10_bytes: 319298700
     rx_queue_11_packets: 1064331
     rx_queue_11_bytes: 319299300
     rx_queue_12_packets: 1064325
     rx_queue_12_bytes: 319297500
     rx_queue_13_packets: 1064325
     rx_queue_13_bytes: 319297500
     rx_queue_14_packets: 1064331
     rx_queue_14_bytes: 319299300
     rx_queue_15_packets: 1064330
     rx_queue_15_bytes: 319299000
     rx_queue_16_packets: 0
     rx_queue_16_bytes: 0
     rx_queue_17_packets: 0
     rx_queue_17_bytes: 0
     rx_queue_18_packets: 0
     rx_queue_18_bytes: 0
     rx_queue_19_packets: 0
     rx_queue_19_bytes: 0
     rx_queue_20_packets: 0
     rx_queue_20_bytes: 0
     rx_queue_21_packets: 0
     rx_queue_21_bytes: 0
     rx_queue_22_packets: 0
     rx_queue_22_bytes: 0
     rx_queue_23_packets: 0
     rx_queue_23_bytes: 0
     rx_queue_24_packets: 0
     rx_queue_24_bytes: 0
     rx_queue_25_packets: 0
     rx_queue_25_bytes: 0
     rx_queue_26_packets: 0
     rx_queue_26_bytes: 0
     rx_queue_27_packets: 0
     rx_queue_27_bytes: 0
     rx_queue_28_packets: 0
     rx_queue_28_bytes: 0
     rx_queue_29_packets: 0
     rx_queue_29_bytes: 0
     rx_queue_30_packets: 0
     rx_queue_30_bytes: 0
     rx_queue_31_packets: 0
     rx_queue_31_bytes: 0
     rx_queue_32_packets: 0
     rx_queue_32_bytes: 0
     rx_queue_33_packets: 0
     rx_queue_33_bytes: 0
     rx_queue_34_packets: 0
     rx_queue_34_bytes: 0
     rx_queue_35_packets: 0
     rx_queue_35_bytes: 0
     rx_queue_36_packets: 0
     rx_queue_36_bytes: 0
     rx_queue_37_packets: 0
     rx_queue_37_bytes: 0
     rx_queue_38_packets: 0
     rx_queue_38_bytes: 0
     rx_queue_39_packets: 0
     rx_queue_39_bytes: 0
     rx_queue_40_packets: 0
     rx_queue_40_bytes: 0
     rx_queue_41_packets: 0
     rx_queue_41_bytes: 0
     rx_queue_42_packets: 0
     rx_queue_42_bytes: 0
     rx_queue_43_packets: 0
     rx_queue_43_bytes: 0
     rx_queue_44_packets: 0
     rx_queue_44_bytes: 0
     rx_queue_45_packets: 0
     rx_queue_45_bytes: 0
     rx_queue_46_packets: 0
     rx_queue_46_bytes: 0
     rx_queue_47_packets: 0
     rx_queue_47_bytes: 0
     rx_queue_48_packets: 0
     rx_queue_48_bytes: 0
     rx_queue_49_packets: 0
     rx_queue_49_bytes: 0
     rx_queue_50_packets: 0
     rx_queue_50_bytes: 0
     rx_queue_51_packets: 0
     rx_queue_51_bytes: 0
     rx_queue_52_packets: 0
     rx_queue_52_bytes: 0
     rx_queue_53_packets: 0
     rx_queue_53_bytes: 0
     rx_queue_54_packets: 0
     rx_queue_54_bytes: 0
     rx_queue_55_packets: 0
     rx_queue_55_bytes: 0
     rx_queue_56_packets: 0
     rx_queue_56_bytes: 0
     rx_queue_57_packets: 0
     rx_queue_57_bytes: 0
     rx_queue_58_packets: 0
     rx_queue_58_bytes: 0
     rx_queue_59_packets: 0
     rx_queue_59_bytes: 0
     rx_queue_60_packets: 0
     rx_queue_60_bytes: 0
     rx_queue_61_packets: 0
     rx_queue_61_bytes: 0
     rx_queue_62_packets: 0
     rx_queue_62_bytes: 0
     rx_queue_63_packets: 0
     rx_queue_63_bytes: 0
     tx_pb_0_pxon: 0
     tx_pb_0_pxoff: 0
     tx_pb_1_pxon: 0
     tx_pb_1_pxoff: 0
     tx_pb_2_pxon: 0
     tx_pb_2_pxoff: 0
     tx_pb_3_pxon: 0
     tx_pb_3_pxoff: 0
     tx_pb_4_pxon: 0
     tx_pb_4_pxoff: 0
     tx_pb_5_pxon: 0
     tx_pb_5_pxoff: 0
     tx_pb_6_pxon: 0
     tx_pb_6_pxoff: 0
     tx_pb_7_pxon: 0
     tx_pb_7_pxoff: 0
     rx_pb_0_pxon: 0
     rx_pb_0_pxoff: 0
     rx_pb_1_pxon: 0
     rx_pb_1_pxoff: 0
     rx_pb_2_pxon: 0
     rx_pb_2_pxoff: 0
     rx_pb_3_pxon: 0
     rx_pb_3_pxoff: 0
     rx_pb_4_pxon: 0
     rx_pb_4_pxoff: 0
     rx_pb_5_pxon: 0
     rx_pb_5_pxoff: 0
     rx_pb_6_pxon: 0
     rx_pb_6_pxoff: 0
     rx_pb_7_pxon: 0
     rx_pb_7_pxoff: 0

解决方法

[EDIT-1 基于评论更新和共享的代码片段]

DPDK NIC 82599 NIC 支持多个 RX 队列接收和多个 TX 队列发送。有两种类型的统计信息 PMD based rte_eth_stats_get 和 HW register based rte_eth_stats_get。

当使用 DPDK 统计数据 rte_eth_stats_get 时，PMD 将针对每个 rte_eth_rx_burst 更新 rx 统计数据。因此，要么需要定期调用 rte_eth_rx_burst，要么在轮询循环中运行它。

解决方案：在dev_configure之前修改代码启用RSS，允许流量分布在多个RX队列中。用下面的代码替换当前的 rte_eth_dev_configure

struct rte_eth_conf local_port_conf = port_conf;
local_port_conf.rx_adv_conf.rss_conf.rss_hf &= dev_info.flow_type_rss_offloads;
if (local_port_conf.rx_adv_conf.rss_conf.rss_hf != port_conf_default.rx_adv_conf.rss_conf.rss_hf)
{
        printf("Port %u modified RSS hash function based on hardware support,"
                "requested:%#"PRIx64" configured:%#"PRIx64"\n",port,port_conf.rx_adv_conf.rss_conf.rss_hf,local_port_conf.rx_adv_conf.rss_conf.rss_hf);
}
retval = rte_eth_dev_configure(port,rx_rings,tx_rings,&local_port_conf);

注意：我已经在英特尔 FVL 和 CVL 上验证了相同的内容，通过评论请求更新。

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错误1：gradle项目控制台输出为乱码 # 解决方案：https://blog.csdn.net/weixin_43501566/article/details/112482302 # 在gradle-wrapper.properties 添加以下内容 org.gradle.jvmargs=-Df
Mybatis Plus传入参数0不起作用
错误还原：在查询的过程中，传入的workType为0时，该条件不起作用 &lt;select id=&quot;xxx&quot;&gt; SELECT di.id, di.name, di.work_type, di.updated... &lt;where&gt; &lt;if test=&qu
linux中make编译源码包失败
报错如下，gcc版本太低 ^ server.c:5346:31: 错误：‘struct redisServer’没有名为‘server_cpulist’的成员 redisSetCpuAffinity(server.server_cpulist); ^ server.c: 在函数‘hasActiveC
微服务启动错误：Command line is too long. Shorten command line for
解决方案1 1、改项目中.idea/workspace.xml配置文件，增加dynamic.classpath参数 2、搜索PropertiesComponent，添加如下 &lt;property name=&quot;dynamic.classpath&quot; value=&quot;tru
vue常见错误
删除根组件app.vue中的默认代码后报错：Module Error (from ./node_modules/eslint-loader/index.js): 解决方案：关闭ESlint代码检测，在项目根目录创建vue.config.js，在文件中添加 module.exports = { lin
spark常见错误
查看spark默认的python版本 [root@master day27]# pyspark /home/software/spark-2.3.4-bin-hadoop2.7/conf/spark-env.sh: line 2: /usr/local/hadoop/bin/hadoop: No s
matplotlib报错：AttributeError: module 'backend_interagg' has no attribute 'FigureCanvas'. Did you mean: 'FigureCanvasAgg'?
使用本地python环境可以成功执行 import pandas as pd import matplotlib.pyplot as plt # 设置字体 plt.rcParams[&#39;font.sans-serif&#39;] = [&#39;SimHei&#39;] # 能正确显示负号 p
gitlab登录失败，报错：This challenge page was accidentally cached by an intermediary and is no longer available.
设置时间 控制面板
后端开发常见错误
错误1：Request method ‘DELETE‘ not supported 错误还原：controller层有一个接口，访问该接口时报错：Request method ‘DELETE‘ not supported 错误原因：没有接收到前端传入的参数，修改为如下 参考 错误2：cannot r
docker常见错误
错误1：启动docker镜像时报错：Error response from daemon: driver failed programming external connectivity on endpoint quirky_allen 解决方法：重启docker -&gt; systemctl r
idea常见错误
错误1：private field ‘xxx‘ is never assigned 按Altʾnter快捷键，选择第2项 参考：https://blog.csdn.net/shi_hong_fei_hei/article/details/88814070 错误2：启动时报错，不能找到主启动类 #
pip安装依赖失败
报错如下，通过源不能下载，最后警告pip需升级版本 Requirement already satisfied: pip in c:\users\ychen\appdata\local\programs\python\python310\lib\site-packages (22.0.4) Coll
maven常见错误
错误1：maven打包报错 错误还原：使用maven打包项目时报错如下 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources (default-resources)
cloud项目中常见错误
错误1：服务调用时报错 服务消费者模块assess通过openFeign调用服务提供者模块hires 如下为服务提供者模块hires的控制层接口 @RestController @RequestMapping(&quot;/hires&quot;) public class FeignControl
springboot常见错误
错误1：运行项目后报如下错误 解决方案 报错2：Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sb 解决方案：在pom.
springmvc拦截器中使用redisTemplate报空指针异常
参考 错误原因 过滤器或拦截器在生效时，redisTemplate还没有注入 解决方案：在注入容器时就生效 @Component //项目运行时就注入Spring容器 public class RedisBean { @Resource private RedisTemplate&lt;String
vite报错：npm ERR! command C:WINDOWSsystem32cmd.exe /d /s /c C:UsersychenAppDataLocalTempnpx-dde1c848.cmd
使用vite构建项目报错 C:\Users\ychen\work&gt;npm init @vitejs/app @vitejs/create-app is deprecated, use npm init vite instead C:\Users\ychen\AppData\Local\npm-
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