dpdk 学习

查看当前网卡绑定的驱动状态

wangli@wangli-desktop:~/dpdk_learn/dpdk-22.03$ ./usertools/dpdk-devbind.py --status

Network devices using kernel driver
===================================
0000:02:00.0 'RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller 8161' if=enp2s0 drv=r8169 unused=vfio-pci *Active*
0000:07:00.0 'RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller 8168' if=enp7s0 drv=r8169 unused=vfio-pci *Active*

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
===========================

给网卡绑定vfio-pci 驱动

# 先关闭网卡
sudo ifconfig enp2s0 down
sudo ./usertools/dpdk-devbind.py --bind=vfio-pci enp2s0

重新观察驱动绑定情况

wangli@wangli-desktop:~/dpdk_learn/dpdk-22.03$ ./usertools/dpdk-devbind.py --status

Network devices using DPDK-compatible driver
============================================
0000:02:00.0 'RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller 8161' drv=vfio-pci unused=r8169

Network devices using kernel driver
===================================
0000:07:00.0 'RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller 8168' if=enp7s0 drv=r8169 unused=vfio-pci *Active*

确认是否使用vfio

lspci -nnv | grep "Kernel driver in use"

02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8161] (rev 15)
Subsystem: Realtek Semiconductor Co., Ltd. TP-Link TG-3468 v4.0 Gigabit PCI Express Network Adapter [10ec:8168]
Flags: fast devsel, IRQ 36, IOMMU group 16
I/O ports at e000 [size=256]
Memory at fb304000 (64-bit, non-prefetchable) [size=4K]
Memory at fb300000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: vfio-pci
Kernel modules: r8169

配置hugepage

sudo su
echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

测试helloworld

cd /home/wangli/dpdk_learn/dpdk-22.03/examples/helloworld/build
wangli@wangli-desktop:~/dpdk_learn/dpdk-22.03/examples/helloworld/build$ sudo ./helloworld -l 0-3 -n 4
EAL: Detected CPU lcores: 20
EAL: Detected NUMA nodes: 1
EAL: Detected shared 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
hello from core 1
hello from core 2
hello from core 3
hello from core 0

安装 libpcap-dev 使用纯软件的pmd

why

hwoto

The main reason why DPDK ports are not identified in your environment is because the NIC in use is not having a supported vendor Poll Mode Driver. Please refer to list of supported NIC from various vendor Realtek is not among them.

sudo apt-get install libpcap-dev

dpdk rte_eth_dev_count_avail()返回0 问题解决记录