Gadget mass storage passthrough I'm using Yocto in kernel 4.14 (computer 1). I have two USB port : Host : with a USB key (mass storage device) plugged OTG : connected to another computer (computer 2) ################ ############### |USB_KEY|----## COMPUTER 1 ##----## COMPUTER 2##---|screen, keyboard, ... ################ ############### ^ ^ USB link 1 USB link 2 I am trying to access the USB key connected on the computer 1 from the computer 2. I use g_ether gadget with the USB link 2 and I should use another gadget module like a mass storage gadget. Can the computer 1 passthrough to a mass storage gadget? Thanks

And the solution was :


g_multi


**Edit :**

g_multi is the gadget usb called "Multifunction Composite Gadget" in Kernel. This module have two options :


< > Multifunction Composite Gadget
[ ] RNDIS + CDC Serial + Storage configuration
[ ] CDC Ethernet + CDC Serial + Storage configuration


In my case I use the first option. But I have no reson to use the CDC Serial.

To enable it :


modprobe g_multi file=/dev/sda # sda is your USB mass storage device


This command will creates both usb0 network interface and mass storage device on host device. It also creates CDC Serial.

Now I use the USB gadget set up though configfs. See the documentaion : Gadget configfs documentation

With this "new" USB gadget system you will choose which all gadgets you want.