参考https://blog.csdn.net/sinat_20184565/article/details/92700223

官方文档：

http://doc.dpdk.org/dts/test_plans/kni_test_plan.html

[root@localhost dpdk-19.11]# insmod ./build/kmod/rte_kni.ko kthread_mode=multiple
insmod: ERROR: could not insert module ./build/kmod/rte_kni.ko: Invalid module format
[root@localhost dpdk-19.11]# insmod ./build/build/kernel/linux/kni/rte_kni.ko  kthread_mode=multiple
insmod: ERROR: could not insert module ./build/build/kernel/linux/kni/rte_kni.ko: Invalid module format
[root@localhost dpdk-19.11]# uname -a
Linux localhost.localdomain 4.14.0-115.el7a.0.1.aarch64 #1 SMP Sun Nov 25 20:54:21 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux

[root@localhost dpdk-19.11]# ls /usr/src/
debug  kernels
[root@localhost dpdk-19.11]# ls /usr/src/kernels/
4.18.0-193.28.1.el7.aarch64
[root@localhost dpdk-19.11]# 

[root@localhost dpdk-19.11]#  yum install "kernel-devel-uname-r == $(uname -r)"
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.worria.com
 * extras: mirror.worria.com
 * updates: mirror.worria.com
file:///mnt/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /mnt/repodata/repomd.xml"
Trying other mirror.
Resolving Dependencies
--> Running transaction check
---> Package kernel-devel.aarch64 0:4.14.0-115.el7a.0.1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================================================================================================================================================================================================
 Package                                                        Arch                                                      Version                                                                 Repository                                               Size
================================================================================================================================================================================================================================================================
Installing:
 kernel-devel                                                   aarch64                                                   4.14.0-115.el7a.0.1                                                     cdrom                                                    11 M

Transaction Summary
================================================================================================================================================================================================================================================================
Install  1 Package

Total download size: 11 M
Installed size: 43 M
Is this ok [y/d/N]: y
Downloading packages:


Error downloading packages:
  kernel-devel-4.14.0-115.el7a.0.1.aarch64: [Errno 256] No more mirrors to try.

[root@localhost dpdk-19.11]# 

挂载CentOS-7-aarch64-Everything-1810.iso

[root@localhost dpdk-19.11]# vi /etc/yum
yum/         yum.conf     yum.repos.d/ 
[root@localhost dpdk-19.11]# vi /etc/yum
yum/         yum.conf     yum.repos.d/ 
[root@localhost dpdk-19.11]# vi /etc/yum.repos.d/
cdrom.repo             CentOS-Base.repo       CentOS-CR.repo         CentOS-Debuginfo.repo  CentOS-fasttrack.repo  CentOS-Media.repo      CentOS-Sources.repo    CentOS-Vault.repo      
[root@localhost dpdk-19.11]# vi /etc/yum.repos.d/cdrom.repo 
[cdrom]

name=cdrom

baseurl=file:///sr0

enabled=1

gpgcheck=0

[root@localhost dpdk-19.11]#  yum install "kernel-devel-uname-r == $(uname -r)"
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.worria.com
 * extras: mirror.worria.com
 * updates: mirror.worria.com
cdrom                                                                                                                                                                                                                                    | 3.6 kB  00:00:00     
Resolving Dependencies
--> Running transaction check
---> Package kernel-devel.aarch64 0:4.14.0-115.el7a.0.1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================================================================================================================================================================================================
 Package                                                        Arch                                                      Version                                                                 Repository                                               Size
================================================================================================================================================================================================================================================================
Installing:
 kernel-devel                                                   aarch64                                                   4.14.0-115.el7a.0.1                                                     cdrom                                                    11 M

Transaction Summary
================================================================================================================================================================================================================================================================
Install  1 Package

Total download size: 11 M
Installed size: 43 M
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : kernel-devel-4.14.0-115.el7a.0.1.aarch64                                                                                                                                                                                                     1/1 
  Verifying  : kernel-devel-4.14.0-115.el7a.0.1.aarch64                                                                                                                                                                                                     1/1 

Installed:
  kernel-devel.aarch64 0:4.14.0-115.el7a.0.1                                                                                                                                                                                                                    

Complete!
[root@localhost dpdk-19.11]# 

安装成功

root@localhost dpdk-19.11]# ls /usr/src/kernels/
4.14.0-115.el7a.0.1.aarch64  4.18.0-193.28.1.el7.aarch64
[root@localhost dpdk-19.11]# 

[root@localhost dpdk-19.11]# ln -sf /usr/src/kernels/4.14.0-115.el7a.0.1.aarch64/  /lib/modules/4.14.0-115.el7a.0.1.aarch64/build 
[root@localhost dpdk-19.11]# ls /lib/modules/4.14.0-115.el7a.0.1.aarch64/ -al
total 1772
drwxr-xr-x.  7 root root   4096 Jun 10 02:50 .
drwxr-xr-x.  3 root root     41 Jun  9 23:17 ..
lrwxrwxrwx.  1 root root     45 Jun 10 02:50 build -> /usr/src/kernels/4.18.0-193.28.1.el7.aarch64/
drwxr-xr-x.  2 root root      6 Nov 25  2018 extra
drwxr-xr-x. 12 root root    132 Jun  9 23:17 kernel
-rw-r--r--.  1 root root 490436 Jun  9 23:18 modules.alias
-rw-r--r--.  1 root root 475434 Jun  9 23:18 modules.alias.bin
-rw-r--r--.  1 root root    671 Nov 25  2018 modules.block
-rw-r--r--.  1 root root   6516 Nov 25  2018 modules.builtin
-rw-r--r--.  1 root root   8572 Jun  9 23:18 modules.builtin.bin
-rw-r--r--.  1 root root 110565 Jun  9 23:18 modules.dep
-rw-r--r--.  1 root root 168102 Jun  9 23:18 modules.dep.bin
-rw-r--r--.  1 root root    288 Jun  9 23:18 modules.devname
-rw-r--r--.  1 root root    113 Nov 25  2018 modules.drm
-rw-r--r--.  1 root root     68 Nov 25  2018 modules.modesetting
-rw-r--r--.  1 root root   1091 Nov 25  2018 modules.networking
-rw-r--r--.  1 root root  52153 Nov 25  2018 modules.order
-rw-r--r--.  1 root root    511 Jun  9 23:18 modules.softdep
-rw-r--r--.  1 root root 208659 Jun  9 23:18 modules.symbols
-rw-r--r--.  1 root root 248887 Jun  9 23:18 modules.symbols.bin
lrwxrwxrwx.  1 root root      5 Jun  9 23:17 source -> build
drwxr-xr-x.  2 root root      6 Nov 25  2018 updates
drwxr-xr-x.  2 root root     21 Jun  9 23:17 vdso
drwxr-xr-x.  2 root root      6 Jun  9 23:17 weak-updates
[root@localhost dpdk-19.11]# rm   /lib/modules/4.14.0-115.el7a.0.1.aarch64/build
rm: remove symbolic link ‘/lib/modules/4.14.0-115.el7a.0.1.aarch64/build’? y
[root@localhost dpdk-19.11]# ls /lib/modules/4.14.0-115.el7a.0.1.aarch64/ -al
total 1772
drwxr-xr-x.  7 root root   4096 Jun 11 03:37 .
drwxr-xr-x.  3 root root     41 Jun  9 23:17 ..
drwxr-xr-x.  2 root root      6 Nov 25  2018 extra
drwxr-xr-x. 12 root root    132 Jun  9 23:17 kernel
-rw-r--r--.  1 root root 490436 Jun  9 23:18 modules.alias
-rw-r--r--.  1 root root 475434 Jun  9 23:18 modules.alias.bin
-rw-r--r--.  1 root root    671 Nov 25  2018 modules.block
-rw-r--r--.  1 root root   6516 Nov 25  2018 modules.builtin
-rw-r--r--.  1 root root   8572 Jun  9 23:18 modules.builtin.bin
-rw-r--r--.  1 root root 110565 Jun  9 23:18 modules.dep
-rw-r--r--.  1 root root 168102 Jun  9 23:18 modules.dep.bin
-rw-r--r--.  1 root root    288 Jun  9 23:18 modules.devname
-rw-r--r--.  1 root root    113 Nov 25  2018 modules.drm
-rw-r--r--.  1 root root     68 Nov 25  2018 modules.modesetting
-rw-r--r--.  1 root root   1091 Nov 25  2018 modules.networking
-rw-r--r--.  1 root root  52153 Nov 25  2018 modules.order
-rw-r--r--.  1 root root    511 Jun  9 23:18 modules.softdep
-rw-r--r--.  1 root root 208659 Jun  9 23:18 modules.symbols
-rw-r--r--.  1 root root 248887 Jun  9 23:18 modules.symbols.bin
lrwxrwxrwx.  1 root root      5 Jun  9 23:17 source -> build
drwxr-xr-x.  2 root root      6 Nov 25  2018 updates
drwxr-xr-x.  2 root root     21 Jun  9 23:17 vdso
drwxr-xr-x.  2 root root      6 Jun  9 23:17 weak-updates
[root@localhost dpdk-19.11]# ln -sf /usr/src/kernels/4.14.0-115.el7a.0.1.aarch64/  /lib/modules/4.14.0-115.el7a.0.1.aarch64/build 
[root@localhost dpdk-19.11]# ls /lib/modules/4.14.0-115.el7a.0.1.aarch64/ -al
total 1772
drwxr-xr-x.  7 root root   4096 Jun 11 03:38 .
drwxr-xr-x.  3 root root     41 Jun  9 23:17 ..
lrwxrwxrwx.  1 root root     45 Jun 11 03:38 build -> /usr/src/kernels/4.14.0-115.el7a.0.1.aarch64/
drwxr-xr-x.  2 root root      6 Nov 25  2018 extra
drwxr-xr-x. 12 root root    132 Jun  9 23:17 kernel
-rw-r--r--.  1 root root 490436 Jun  9 23:18 modules.alias
-rw-r--r--.  1 root root 475434 Jun  9 23:18 modules.alias.bin
-rw-r--r--.  1 root root    671 Nov 25  2018 modules.block
-rw-r--r--.  1 root root   6516 Nov 25  2018 modules.builtin
-rw-r--r--.  1 root root   8572 Jun  9 23:18 modules.builtin.bin
-rw-r--r--.  1 root root 110565 Jun  9 23:18 modules.dep
-rw-r--r--.  1 root root 168102 Jun  9 23:18 modules.dep.bin
-rw-r--r--.  1 root root    288 Jun  9 23:18 modules.devname
-rw-r--r--.  1 root root    113 Nov 25  2018 modules.drm
-rw-r--r--.  1 root root     68 Nov 25  2018 modules.modesetting
-rw-r--r--.  1 root root   1091 Nov 25  2018 modules.networking
-rw-r--r--.  1 root root  52153 Nov 25  2018 modules.order
-rw-r--r--.  1 root root    511 Jun  9 23:18 modules.softdep
-rw-r--r--.  1 root root 208659 Jun  9 23:18 modules.symbols
-rw-r--r--.  1 root root 248887 Jun  9 23:18 modules.symbols.bin
lrwxrwxrwx.  1 root root      5 Jun  9 23:17 source -> build
drwxr-xr-x.  2 root root      6 Nov 25  2018 updates
drwxr-xr-x.  2 root root     21 Jun  9 23:17 vdso
drwxr-xr-x.  2 root root      6 Jun  9 23:17 weak-updates
[root@localhost dpdk-19.11]# 

重新编译dpdk

[root@localhost dpdk-19.11]# export EXTRA_CFLAGS="-O0 -g"
[root@localhost dpdk-19.11]# export RTE_TARGET=arm64-armv8a-linuxapp-gcc
[root@localhost dpdk-19.11]# xport RTE_SDK=`pwd`
-bash: xport: command not found
[root@localhost dpdk-19.11]# export RTE_SDK=`pwd`
[root@localhost dpdk-19.11]# make  install  T=$RTE_TARGET -j 128

make clean -j 128

make  install  T=$RTE_TARGET -j 128

[root@localhost dpdk-19.11]# find ./ -name rte_kni.ko
./arm64-armv8a-linuxapp-gcc/build/kernel/linux/kni/rte_kni.ko
./arm64-armv8a-linuxapp-gcc/kmod/rte_kni.ko
[root@localhost dpdk-19.11]# insmod ./arm64-armv8a-linuxapp-gcc/kmod/rte_kni.ko

[root@localhost dpdk-19.11]#  rmmod rte_kni.ko
[root@localhost dpdk-19.11]# insmod arm64-armv8a-linuxapp-gcc/kmod/rte_kni.ko  kthread_mode=multiple
[root@localhost dpdk-19.11]# 

[root@localhost dpdk-19.11]# insmod  ./arm64-armv8a-linuxapp-gcc/kmod/igb_uio.ko
insmod: ERROR: could not insert module ./arm64-armv8a-linuxapp-gcc/kmod/igb_uio.ko: Unknown symbol in module
[root@localhost dpdk-19.11]# insmod  ./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
insmod: ERROR: could not insert module ./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko: Unknown symbol in module
[root@localhost dpdk-19.11]# modinfo ./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
filename:       /root/dpdk-19.11/./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
author:         Intel Corporation
license:        GPL
description:    UIO driver for Intel IGB PCI cards
rhelversion:    7.6
srcversion:     26C63DAE2104091D5DE47C6
depends:        uio
name:           igb_uio
vermagic:       4.14.0-115.el7a.0.1.aarch64 SMP mod_unload modversions aarch64
parm:           intr_mode:igb_uio interrupt mode (default=msix):
    msix       Use MSIX interrupt
    msi        Use MSI interrupt
    legacy     Use Legacy interrupt

 (charp)
parm:           wc_activate:Activate support for write combining (WC) (default=0)
    0 - disable
    other - enable
 (int)

原来igb uio依赖uio,uio没有加载

[root@localhost dpdk-19.11]# modprobe uio
[root@localhost dpdk-19.11]# modinfo ./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
filename:       /root/dpdk-19.11/./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
author:         Intel Corporation
license:        GPL
description:    UIO driver for Intel IGB PCI cards
rhelversion:    7.6
srcversion:     26C63DAE2104091D5DE47C6
depends:        uio
name:           igb_uio
vermagic:       4.14.0-115.el7a.0.1.aarch64 SMP mod_unload modversions aarch64
parm:           intr_mode:igb_uio interrupt mode (default=msix):
    msix       Use MSIX interrupt
    msi        Use MSI interrupt
    legacy     Use Legacy interrupt

 (charp)
parm:           wc_activate:Activate support for write combining (WC) (default=0)
    0 - disable
    other - enable
 (int)
[root@localhost dpdk-19.11]# modinfo ./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
filename:       /root/dpdk-19.11/./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
author:         Intel Corporation
license:        GPL
description:    UIO driver for Intel IGB PCI cards
rhelversion:    7.6
srcversion:     26C63DAE2104091D5DE47C6
depends:        uio
name:           igb_uio
vermagic:       4.14.0-115.el7a.0.1.aarch64 SMP mod_unload modversions aarch64
parm:           intr_mode:igb_uio interrupt mode (default=msix):
    msix       Use MSIX interrupt
    msi        Use MSI interrupt
    legacy     Use Legacy interrupt

 (charp)
parm:           wc_activate:Activate support for write combining (WC) (default=0)
    0 - disable
    other - enable
 (int)
[root@localhost dpdk-19.11]# insmod  ./arm64-armv8a-linuxapp-gcc/build/kernel/linux/igb_uio/igb_uio.ko
[root@localhost dpdk-19.11]# 

DPDK KNI内核模块

KNI内核可加载模块rte_kni为DPDK应用提供内核接口。

当rte_kni模块加载时，创建/dev/kni设备节点（rte_kni模块创建kni杂项设备，文件系统节点/dev/kni需要手动或者通过udev机制创建），藉此节点，DPDK KNI应用可控制和与内核rte_kni模块交互。

在内核模块rte_kni加载时，可指定一些可选的参数以控制其行为：

1. 
   
2. # modinfo rte_kni.ko
3. 
   
4. lo_mode: KNI loopback mode (default=lo_mode_none):
5. 
   
6. lo_mode_none Kernel loopback disabled
7. 
   
8. lo_mode_fifo Enable kernel loopback with fifo
9. 
   
10. lo_mode_fifo_skb Enable kernel loopback with fifo and skb buffer
11. 
    
12. 
    
13. 
    
14. kthread_mode: Kernel thread mode (default=single):
15. 
    
16. single Single kernel thread mode enabled.
17. 
    
18. multiple Multiple kernel thread mode enabled.
19. 
    
20. 
    
21. 
    
22. carrier: Default carrier state for KNI interface (default=off):
23. 
    
24. off Interfaces will be created with carrier state set to off.
25. 
    
26. on Interfaces will be created with carrier state set to on.

典型的情况是，在加载rte_kni模块时不指定任何参数，DPDK应用可由内核网络协议栈获取和向其发送报文。不指定任何参数，意味着仅创建一个内核线程处理所有的KNI虚拟设备在内核侧的报文接收，并且禁用回环模式，KNI接口的默认链路状态为关闭off。

# insmod kmod/rte_kni.ko

ports cores:

e.g.:

    --config="(0,1,2),(1,3,4)"              No kernel thread specified.
    --config="(0,1,2,21),(1,3,4,23)"        One kernel thread in use.
    --config="(0,1,2,21,22),(1,3,4,23,25)   Two kernel threads in use.

回环模式

以测试为目的，在加载rte_kni模块式可指定lo_mode参数:

# insmod kmod/rte_kni.ko lo_mode=lo_mode_fifo lo_mode_fifo回环模式将在内核空间中操作FIFO环队列，由函数kni_fifo_get(kni->rx_q,...)和kni_fifo_put(kni->tx_q,...)实现从rx_q接收队列读取报文，再写入发送队列tx_q来实现回环操作。

# insmod kmod/rte_kni.ko lo_mode=lo_mode_fifo_skb

lo_mode_fifo_skb回环模式在以上lo_mode_fifo的基础之上，增加了sk_buff缓存的相关拷贝操作。具体包括将rx_q接收队列的数据拷贝到分配的接收skb缓存中。以及分配发送skb缓存，将之前由rx_q队列接收数据拷贝到发送skb缓存中，使用函数kni_net_tx(skb, dev)发送skb缓存数据。最终将数据报文拷贝到mbuf结构中，使用kni_fifo_put函数加入到tx_q发送队列。可见此回环测试模式，更加接近真实的使用场景。

如果没有指定lo_mode参数，回环模式将禁用。

内核线程模式

为了提供性能的灵活性，内核模块rte_kni在加载时刻指定kthread_mode参数。rte_kni模块支持两个选项：单内核线程模式和多内核线程模式。

如下，使能单内核线程模式:

# insmod kmod/rte_kni.ko kthread_mode=single

此模式为所有的KNI虚拟接口创建唯一的内核线程在内核侧接收数据。默认情况下，此内核线程不绑定在特定的核心上，但是，用户可在创建第一个KNI虚拟接口时通过指定结构体rte_kni_conf的core_id和force_bind成员参数，设置此线程的亲核性。

为达到更高性能，内核线程绑定的核心应当与应用中DPDK的核心在同一个socket上。

KNI内核模块也可配置成为每个DPDK应用创建的KNI虚拟接口启动一个单独的内核线程。以下，使能多内核线程模式：

# insmod kmod/rte_kni.ko kthread_mode=multiple

此模式为每个KNI虚拟接口创建一个单独的内核线程在内核侧接收数据。内核线程的亲核性通过每个KNI虚拟接口创建时的结构体rte_kni_conf成员core_id和force_bind变量参数指定。

如果系统中由足够的未使用核心，多内核线程模式可提供具有扩展性的高性能。

如果kthread_mode参数未指定，使用单内核线程模式。

默认链路状态

内核模块rte_kni创建的KNI虚拟接口的链路状态，可通过模块加装时的carrier选项控制。

如果指定了carrier=off，当接口管理使能时，内核模块将接口的链路状态设置为关闭。DPDK应用可通过函数rte_kni_update_link设置KNI虚拟接口的链路状态。这对于需要KNI虚拟接口状态与对应的物理接口实际状态一致的应用是有用的。

如果指定了carrier=on，当接口管理使能时，内核模块将自动设置接口的链路状态为启用。这对于仅将KNI接口作为纯虚拟接口，而不对应任何物理硬件；或者并不想通过rte_kni_update_link函数显示设置接口链路状态的DPDK应用是有用的。对于物理口为连接任何链路而进行的回环模式测试也是有用的。

以下，设置默认的链路状态为启用:

# insmod kmod/rte_kni.ko carrier=on

以下，设置默认的链路状态为关闭：

# insmod kmod/rte_kni.ko carrier=off

如果carrier参数没有指定，KNI虚拟接口的默认链路状态为关闭。

The following kernel module options are available in case if a loopback mode is required.

kthread_mode=single/multiple – number of kernel threads
lo_mode=lo_mode_fifo/lo_mode_fifo_skb – loopback mode

以下命令首先以多线程模式加载rte_kni内核模块。其次，kni应用指定两个接口（-p 0x3）启动；根据--config参数可知，接口0（0,4,6,8）使用核心4运行接收任务，核心6运行发送任务，并且创建一个KNI虚拟接口vEth0_0，启动一个内核处理线程绑定在核心8上。类似的接口1（0,5,7,9）使用核心5运行接收任务，核心7运行发送任务，并且创建一个KNI虚拟接口vEth1_0，启动一个内核处理线程绑定在核心9上。

# rmmod rte_kni
# insmod kmod/rte_kni.ko kthread_mode=multiple
# ./build/kni -l 4-7 -n 4 -- -P -p 0x3 -m --config="(0,4,6,8),(1,5,7,9)

#/bin/sh

#setup path to DPDK
export RTE_SDK=/home/dpdk
export RTE_TARGET=x86_64-native-linuxapp-gcc

#setup 512 huge pages
mkdir -p /mnt/huge
umount -t hugetlbfs nodev /mnt/huge
mount -t hugetlbfs nodev /mnt/huge
echo 512 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

#bind eth1 and eth2 to Linux generic UIO
modprobe uio_pci_generic

${RTE_SDK}/tools/dpdk_nic_bind.py --bind=uio_pci_generic eth1
${RTE_SDK}/tools/dpdk_nic_bind.py --bind=uio_pci_generic eth2

#insert KNI kernel driver
insmod ${RTE_SDK}/${RTE_TARGET}/kmod/rte_kni.ko

#start KNI sample application
export LD_LIBRARY_PATH=${RTE_SDK}/${RTE_TARGET}/lib/
${RTE_SDK}/examples/kni/build/kni -c 0x0f -n 4 -- -P -p 0x3 --config="(0,0,1),(1,2,3)"

[root@localhost dpdk-19.11]# export RTE_SDK=`pwd`
[root@localhost dpdk-19.11]# export RTE_TARGET=arm64-armv8a-linuxapp-gcc
[root@localhost dpdk-19.11]# make -C examples/kni -j 8
make: Entering directory `/data1/dpdk-19.11/examples/kni'
  CC main.o
  LD kni
  INSTALL-APP kni
  INSTALL-MAP kni.map
make: Leaving directory `/data1/dpdk-19.11/examples/kni'
[root@localhost dpdk-19.11]#  ./examples/kni/build/app/kni -c 0xFFFFF -n 4 -- -P -p 0x3 --config="(0,0,1),
(1,2,3)"
EAL: Detected 128 lcore(s)
EAL: Detected 4 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: No free hugepages reported in hugepages-524288kB
EAL: No free hugepages reported in hugepages-524288kB
EAL: No free hugepages reported in hugepages-524288kB
EAL: No free hugepages reported in hugepages-524288kB
EAL: No available hugepages reported in hugepages-524288kB
EAL: No available hugepages reported in hugepages-2048kB
EAL: FATAL: Cannot get hugepage information.
EAL: Cannot get hugepage information.
EAL: Error - exiting with code: 1
  Cause: Could not initialise EAL (-1)
[root@localhost dpdk-19.11]# 

[root@localhost dpdk-19.11]# cat   /sys/kernel/mm/hugepages/hugepages-524288kB/nr_hugepages
0
[root@localhost dpdk-19.11]# echo 256 >  /sys/kernel/mm/hugepages/hugepages-524288kB/nr_hugepages
[root@localhost dpdk-19.11]# cat   /sys/kernel/mm/hugepages/hugepages-524288kB/nr_hugepages
256
[root@localhost dpdk-19.11]# 

运行./usertools/dpdk-setup.sh

[root@localhost dpdk-19.11]# cat  /sys/devices/system/node/*/hugepages/hugepages-524288kB/nr_hugepages 
64
64
64
64
[root@localhost dpdk-19.11]#

[root@localhost dpdk-19.11]#  ./examples/kni/build/app/kni -c 0xFFFFF -n 4 -- -P -p 0x3 --config="(0,0,1),
(1,2,3)"
EAL: Detected 128 lcore(s)
EAL: Detected 4 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: No available hugepages reported in hugepages-2048kB
EAL: Probing VFIO support...
EAL: PCI device 0000:05:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:200 net_hinic
EAL: PCI device 0000:06:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:200 net_hinic
EAL: PCI device 0000:7d:00.0 on NUMA socket 0
EAL:   probe driver: 19e5:a222 net_hns3
EAL: PCI device 0000:7d:00.1 on NUMA socket 0
EAL:   probe driver: 19e5:a221 net_hns3
EAL: PCI device 0000:7d:00.2 on NUMA socket 0
EAL:   probe driver: 19e5:a222 net_hns3
EAL: PCI device 0000:7d:00.3 on NUMA socket 0
EAL:   probe driver: 19e5:a221 net_hns3
EAL: Error - exiting with code: 1
  Cause: No supported Ethernet device found
[root@localhost dpdk-19.11]# 

# ls -al /dev/kni
crw------- 1 root root 10, 57 Sep 26 12:15 /dev/kni
# cat /proc/misc
 57 kni  //minor number

# dmidecode -t memory | grep Size

原文链接：https://www.cnblogs.com/dream397/p/13565649.html