Linux Kernel - USB IP Tools

[Sujith Varghese]

Hi Anil and all,

I am trying to pass USB device from Server to Client over the network using Kernel - USB IP Tools. Here Server is a machine which shares the USB device and Client is a machine which uses USB device provided by the server over the network.


For my experiment Server and Client is a same Ubuntu machine and trying to access USB over local host.

Here is my experiment details :-

I downloaded the linux kernel 4.16.0 from https://github.com/torvalds/linux and build it for my ubuntu machine . I use the same config file of my existing ubuntu machine. Rebooted my machine with  kernel 4.16.0 . Please see below

$$OptiPlex-380 4.16.0-custom #1 SMP Wed Apr 11 11:54:04 IST 2018 x86_64 x86_64 x86_64 GNU/Linux

Also i build usbip application corresponding to this kernel. The usbip application source is obtained from https://github.com/torvalds/linux/tree/master/tools/usb/usbip

Thus i ensured that both Drivers and USB IP application are compatible . I successfully shared USB Mass storage device over USB-IP without any issues .
Thanks Torvalds and Sourceforge community for providing the such wonderful utility.

Now i will explain my problem.  I tried to share Logitech USB Web-camera through USB IP utility. Server and Client are running on same machine and i am trying to share device via local host. On server side Web Camera listed and successfully exported . Please see the below log

 sudo ./usbip list -l
 - busid 2-1 (0461:4d81)
   Primax Electronics, Ltd : Dell N889 Optical Mouse (0461:4d81)

 - busid 4-2 (0461:4e04)
   Primax Electronics, Ltd : unknown product (0461:4e04)

 - busid 1-8 (046d:082d)
   Logitech, Inc. : HD Pro Webcam C920 (046d:082d)

 sudo ./usbip bind -b 1-8
 usbip: info: bind device on busid 1-8: complete

On client Side , I could successfully attach this Web Cam. Now i got /dev/video0 interface and lsusb command showing the details of WebCam. After that i try to stream the web cam video through vlc player application, but streaming not started and vlc application terminated with below  error message

[00007f9d94000ff8] v4l2 demux error: cannot open device '/dev/video0': Device or resource busy
[00007f9d94000ff8] v4l2 demux error: cannot open device '/dev/video0': Device or resource busy
[00007f9d94000ff8] v4l2 access error: cannot open device '/dev/video0': No such file or directory
[00007f9d900009b8] core input error: open of `v4l2:///dev/video0' failed

Please find the below kernel messages received, when i started video streaming. Note that USB IP Debug is enabled on kernel menuconfig

.......................
.......................

[ 1254.069608] vhci_hcd: vhci_hub_status:249: port 0 status changed
[ 1254.069620] vhci_hcd: vhci_hub_control:335: typeReq 2303 wValue 4 wIndex 1
[ 1254.069622] vhci_hcd: vhci_hub_control:536:  SetPortFeature: USB_PORT_FEAT_RESET
[ 1254.069623] vhci_hcd: vhci_hub_control:556:  SetPortFeature: default 4
[ 1254.069625] vhci_hcd: vhci_hub_control:596: port 0
[ 1254.069627] vhci_hcd: dump_port_status_diff:128: status prev -> new: 00100501 -> 00100511
[ 1254.069629] vhci_hcd: dump_port_status_diff:142:   CONNECTION
[ 1254.069631] vhci_hcd: dump_port_status_diff:145:   USB_PORT_STAT_SPEED_5GBPS
[ 1254.069632] vhci_hcd: dump_port_status_diff:142:  +RESET
[ 1254.069634] vhci_hcd: dump_port_status_diff:142:   POWER
[ 1254.069635] vhci_hcd: dump_port_status_diff:142:   HIGHSPEED
[ 1254.069637] vhci_hcd: dump_port_status_diff:142:   C_RESET
[ 1254.069639] vhci_hcd: dump_port_status_diff:150:
[ 1254.069640] vhci_hcd: vhci_hub_control:604:  bye
[ 1254.069642] vhci_hcd: vhci_hub_status:249: port 0 status changed
[ 1254.277584] vhci_hcd: vhci_hub_control:335: typeReq a300 wValue 0 wIndex 1
[ 1254.277586] vhci_hcd: vhci_hub_control:415:  GetPortStatus port 1
[ 1254.277588] vhci_hcd: vhci_hub_control:470:  GetPortStatus bye 501 10
[ 1254.277590] vhci_hcd: vhci_hub_control:596: port 0
[ 1254.277592] vhci_hcd: dump_port_status_diff:128: status prev -> new: 00100511 -> 00100501
[ 1254.277594] vhci_hcd: dump_port_status_diff:142:   CONNECTION
[ 1254.277596] vhci_hcd: dump_port_status_diff:145:   USB_PORT_STAT_SPEED_5GBPS
[ 1254.277597] vhci_hcd: dump_port_status_diff:142:  -RESET
[ 1254.277599] vhci_hcd: dump_port_status_diff:142:   POWER
[ 1254.277601] vhci_hcd: dump_port_status_diff:142:   HIGHSPEED
[ 1254.277602] vhci_hcd: dump_port_status_diff:142:   C_RESET
[ 1254.277604] vhci_hcd: dump_port_status_diff:150:
[ 1254.277606] vhci_hcd: vhci_hub_control:604:  bye
[ 1254.277608] vhci_hcd: vhci_hub_status:249: port 0 status changed
**[ 1254.277618] usb usb6-port1: Cannot enable. Maybe the USB cable is bad?**

.......................
.......................

[ 1260.893864] vhci_hcd: vhci_hub_control:335: typeReq 2301 wValue 1 wIndex 1
[ 1260.893866] vhci_hcd: vhci_hub_control:382:  ClearPortFeature: default 1
[ 1260.893873] vhci_hcd: vhci_hub_control:596: port 0
[ 1260.893875] vhci_hcd: dump_port_status_diff:128: status prev -> new: 00100501 -> 00100501
[ 1260.893876] vhci_hcd: dump_port_status_diff:142:   CONNECTION
[ 1260.893878] vhci_hcd: dump_port_status_diff:145:   USB_PORT_STAT_SPEED_5GBPS
[ 1260.893879] vhci_hcd: dump_port_status_diff:142:   POWER
[ 1260.893880] vhci_hcd: dump_port_status_diff:142:   HIGHSPEED
[ 1260.893882] vhci_hcd: dump_port_status_diff:142:   C_RESET
[ 1260.893883] vhci_hcd: dump_port_status_diff:150:
[ 1260.893884] vhci_hcd: vhci_hub_control:604:  bye
[ 1260.893886] vhci_hcd: vhci_hub_status:249: port 0 status changed
**[ 1260.893897] usb usb6-port1: unable to enumerate USB device**

.......................
.......................

[ 1260.893962] vhci_hcd: dump_port_status_diff:128: status prev -> new: 00100501 -> 00000501
[ 1260.893964] vhci_hcd: dump_port_status_diff:142:   CONNECTION
[ 1260.893965] vhci_hcd: dump_port_status_diff:145:   USB_PORT_STAT_SPEED_5GBPS
[ 1260.893966] vhci_hcd: dump_port_status_diff:142:   POWER
[ 1260.893968] vhci_hcd: dump_port_status_diff:142:   HIGHSPEED
[ 1260.893969] vhci_hcd: dump_port_status_diff:142:  -C_RESET
[ 1260.893970] vhci_hcd: dump_port_status_diff:150:
[ 1260.893972] vhci_hcd: vhci_hub_control:604:  bye
[ 1260.893981] vhci_hcd: vhci_hub_control:335: typeReq a300 wValue 0 wIndex 1
[ 1260.893983] vhci_hcd: vhci_hub_control:415:  GetPortStatus port 1
[ 1260.893984] vhci_hcd: vhci_hub_control:470:  GetPortStatus bye 501 0
[ 1260.893986] vhci_hcd: vhci_hub_control:596: port 0
[ 1260.893988] vhci_hcd: dump_port_status_diff:128: status prev -> new: 00000501 -> 00000501
[ 1260.893989] vhci_hcd: dump_port_status_diff:142:   CONNECTION
[ 1260.893991] vhci_hcd: dump_port_status_diff:145:   USB_PORT_STAT_SPEED_5GBPS
[ 1260.893992] vhci_hcd: dump_port_status_diff:142:   POWER
[ 1260.893993] vhci_hcd: dump_port_status_diff:142:   HIGHSPEED
[ 1260.893995] vhci_hcd: dump_port_status_diff:150:
[ 1260.893996] vhci_hcd: vhci_hub_control:604:  bye
**[ 1260.894012] usb usb6: vhci_bus_suspend**


Any help is most appreciated.
Thanks in advance

[Anil Kumar Pugalia]

Check if it is working without using usbip.

Regards
Anil

Passion: http://sysplay.in (Playing with Systems)

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[Sujith Varghese]

It is working. 

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[Anil Kumar Pugalia]

Then, it might help tracing the usbip code, as to what is triggering the error.

Regards
Anil

Passion: http://sysplay.in (Playing with Systems)

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