DPDK testpmd运行失败：未探测到以太网设备（Ubuntu 22.04）

问题场景 #

Ubuntu 22.04系统，使用dpdk-stable-21.11.5版本，已完成编译安装。两块网卡绑定vfio-pci/uio_pci_generic/igb_uio驱动后，运行dpdk-testpmd提示未探测到以太网设备。

设备绑定信息 #

Network devices using DPDK-compatible driver
============================================
0000:03:00.0 'Device 125c' drv=vfio-pci unused=igc,igb_uio,uio_pci_generic
0000:04:00.0 'Device 125c' drv=vfio-pci unused=igc,igb_uio,uio_pci_generic

Network devices using kernel driver
===================================
0000:02:00.0 'Device 125c' if=enp2s0 drv=igc unused=igb_uio,vfio-pci,uio_pci_generic *Active*
0000:05:00.0 'Device 125c' if=enp5s0 drv=igc unused=igb_uio,vfio-pci,uio_pci_generic 

No 'Baseband' devices detected
==============================

No 'Crypto' devices detected
============================

No 'DMA' devices detected
=========================

No 'Eventdev' devices detected
==============================

No 'Mempool' devices detected
=============================

No 'Compress' devices detected
==============================

No 'Misc (rawdev)' devices detected
===================================

No 'Regex' devices detected
===========================

testpmd运行日志 #

EAL: Detected CPU lcores: 4
EAL: Detected NUMA nodes: 1
EAL: Detected static linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
testpmd: No probed ethernet devices
testpmd: create a new mbuf pool <mb_pool_0>: n=171456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
Done
No commandline core given, start packet forwarding
io packet forwarding - ports=0 - cores=0 - streams=0 - NUMA support enabled, MP allocation mode: native

  io packet forwarding packets/burst=32
  nb forwarding cores=1 - nb forwarding ports=0
Press enter to exit

Telling cores to stop...
Waiting for lcores to finish...

  +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++
  RX-packets: 0              RX-dropped: 0             RX-total: 0
  TX-packets: 0              TX-dropped: 0             TX-total: 0
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Done.

Bye...

排查与解决步骤 #

1. 确认网卡驱动编译状态
   设备ID125c对应Intel I225系列网卡，DPDK 21.11.5版本的igc驱动支持该型号。进入DPDK源码目录，执行：

   cat build/.config | grep RTE_DRIVER_IGC
   

   确保输出为CONFIG_RTE_DRIVER_IGC=y。若为n，重新编译DPDK并添加参数：

   meson setup build -D RTE_DRIVER_IGC=y
   ninja -C build
   

2. 配置VFIO权限与IOMMU
   使用vfio-pci驱动时，需确保系统配置正确：

   • 加载vfio-pci模块：modprobe vfio-pci
   • 检查IOMMU状态：dmesg | grep -i iommu，确认输出包含IOMMU enabled。未启用则在GRUB启动参数中添加intel_iommu=on（Intel CPU）或amd_iommu=on（AMD CPU），执行update-grub后重启。
   • 修正NUMA节点匹配：执行echo 0 > /sys/bus/pci/devices/0000:03:00.0/numa_node（替换为你的网卡PCI地址）。

3. 强制指定PCI设备启动testpmd
   启动testpmd时直接指定绑定的网卡PCI地址，避免自动探测失败：

   dpdk-testpmd -l 0-1 -n 4 --device 0000:03:00.0 --device 0000:04:00.0 --
   

   其中-l指定使用的CPU核心范围，-n指定内存通道数，根据自身系统调整。

4. 验证环境变量与网卡状态

   • 确认DPDK环境变量设置正确：

     export RTE_SDK=/path/to/dpdk-stable-21.11.5
     export RTE_TARGET=x86_64-native-linux-gcc
     

   • 检查网卡是否被占用：lsof | grep enp3s0（替换为网卡原接口名），终止占用进程后重新绑定：

     dpdk-devbind.py -u 0000:03:00.0
     dpdk-devbind.py -b vfio-pci 0000:03:00.0
     

内容的提问来源于stack exchange，提问作者Hikaricat