linux ping 虚拟网卡_linux usb虚拟网卡（NCM）

1. kernel config

USB Gadget precomposed configurations

Ethernet Gadget (with CDC Ethernet support)

Network Control Model (NCM) support

2. build modules

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- modules

LD [M]  drivers/usb/gadget/function/u_ether.ko

LD [M]  drivers/usb/gadget/function/usb_f_ncm.ko

LD [M]  drivers/usb/gadget/legacy/g_ncm.ko

LD [M]  drivers/usb/gadget/libcomposite.ko

3. test on ubuntu

ubuntu ver: ubuntu 14(kernel 3.13)

test mc40 usb2.0 device in haps

3.1 config & build module, then copy these ko to ~/repo-usb/rootfs/rootfs-m/opt/ko/usb/gadget

3.2 boot kernel and insmod ko(enable NCM)

cd /opt/ko/usb/gadget/

insmod  ./function/u_ether.ko

insmod libcomposite.ko

insmod ./function/usb_f_ncm.ko

insmod ./legacy/g_ncm.ko

after insmod ./legacy/g_ncm.ko:

[  628.442369] using random self ethernet address

[  628.501629] using random host ethernet address

[  628.606386] usb0: HOST MAC 06:58:53:5b:52:79

[  628.634146] usb0: MAC 32:03:c1:66:a6:d0

[  628.658956] g_ncm gadget: NCM Gadget

[  628.668534] g_ncm gadget: g_ncm ready

[  636.719628] g_ncm gadget: high-speed config #1: CDC Ethernet (NCM)

3.3 check if usb ethernet is ok or not

1) on device side

2) on pc host side

3.4 configure

1) device

ifconfig usb0 up

ifconfig usb0 192.168.1.2

2) pc host

ifconfig usb0 192.168.1.3

3.5 ping test

1) pc host

ping 192.168.1.2

2) device

ping 192.168.1.3