linux-kernel - Re: vUDC

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Message-id: <55c43577-1389-8e11-724b-8b8235abb7a6@samsung.com>
Date:   Thu, 08 Dec 2016 16:07:24 +0100
From:   Krzysztof Opasiak <k.opasiak@...sung.com>
To:     Shuah Khan <shuahkhan@...il.com>,
        Elen Niedermeyer <elen.niedermeyer@...tronik.com>
Cc:     linux-usb@...r.kernel.org, kernelnewbies@...linux.org,
        LKML <linux-kernel@...r.kernel.org>, shuah@...nel.org
Subject: Re: vUDC

Hi,

On 12/08/2016 03:33 PM, Shuah Khan wrote:
> Hi Elen,
> 
> Adding k.opasiak@...sung.com
> 
> On Thu, Dec 8, 2016 at 7:07 AM, Elen Niedermeyer
> <elen.niedermeyer@...tronik.com> wrote:
>> Dear Sir or Madam,
>>
>> I'm trying to run usbip-vudc since a few days. I want to access my emulated usb devices over usbip.
>> I use Ubuntu 16.04.01 and updated my kernel to version 4.8.0-30. I've installed linux-tools-4.8.0-30-generic which includes usbip. I enabled the modules usbip-host and usbip-vudc on the server. Futhermore I use configfs to emulate the usb devices.
>> So I could start the daemon and my emulation. But I can't detect my emulated usb device with usbip to bind it.
>> Could you help me to run usbip-vudc? Do I have to install an additional package? Do I miss a step?
>>
>> Mit freundlichen Grüßen
>> Kind regards,
> 
> Could you please send your dmesg? Also could you run usbipd with
> --debug and usbip with --log option and send the syslog
> 
> Krzysztof,
> 

You setup script should look like this:

Server:
$ modprobe usbip-vudc
# Create your gadget, for example:
$ cd /sys/kernel/config/usb_gadget
$ mkdir g1
$ mkdir g1/functions/acm.ser0
$ mkdir g1/configs/c.1
$ ln -s g1/functions/acm.ser0 g1/configs/c.1
$ echo "0x1234" > g1/idVendor
$ echo "0x5678" > g1/idProduct
$ echo usbip-vudc.0 > UDC
$ usbipd --device

Client:
$ modprobe usbip-vhci
$ usbip attach -r $SERVER_IP -d usbip-vudc.0

Please let me know if your setup script is similar and what exactly is
not working for you.

> Any ideas. Maybe it is time the documentation is updated with vudc details.
> 

Yes I think it's a good idea. I'll try to do this when I have some spare
time.

Best regards,
-- 
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics