USB Class

1 USBFN Class

1.1 COM

1.1.1 COM

@ atci_main.c, hal_platform.h

1.1.2 VCOM

@ atci_main.c, serial_port.h

1.2 RMNET

1.2.1 BAM Match

@ drivers/usb/gadget/function/u_bam.c

[...]

2 Host Class

2.1 Android Ethernet Porting Guide

2.1.1 Usual network commands for Android
netstat, netcfg, ifconfig, ip route.
You can config ethernet ip address manually like as below:
ifconfig eth0 up
ifconfig eth0 192.168.0.2 netmask 255.255.255.0

2.1.2 Ethernet configuration
@ frameworks/base/core/res/res/values/config.xml, search networkAttributes,
append the following line <item>"ethernet,9,9,0,-1,true"</item> , which is
illustrated as below:
[Connection name],
[ConnectivityManager.TYPE_xxxx],
[associated radio-type],
[priority],
[restoral-timer(ms)],
[dependencyMet]

Then search radioAttributes
Append the following line <item>”9,1”</item>, which is illustrated as below:
[ConnectivityManager connectionType],
[simultaneous connection types]"

For tethering, search config_tether_upstream_types,
Add <item>9</item>

Add two services device/qcom/common/rootdir/etc/init.qcom.rc like as below:
service dhcpcd_eth0 /system/bin/dhcpcd -ABKL
class main
disabled
oneshot

service iprenew_eth0 /system/bin/dhcpcd -n
class main
disabled
oneshot

In Android, EthernetNetworkFactory.java can be found under frameworks/
/opt/net/ethernet/java/com/android/server/ethernet/
Please add logs in this file when debug android ethernet function.
Add Ethernet feature under device/qcom/{ro.board.platform}/{ro.board.platform}.mk as shown below:
PRODUCT_COPY_FILES += \
frameworks/native/data/etc/android.hardware.ethernet.xml:system/etc/perm
issions/android.hardware.ethernet.xml

2.1.3 System level route config
Firstly, open Windows command shell, please do shown as below:
adb shell
su
cat /proc/net/route
# add a route
ip route 192.168.0.1/32 dev eth0
# delete a route
ip route del 192.168.0.1/32
You should add ip as prefix in the route, which is not the same as general Linux
release version, also you can typo ‘ip route help’ to get more helps