WSL2-Linux-Kernel/tools/usb/usbip
Nobuo Iwata a38711a88b usbip: auto retry for concurrent attach
This patch adds recovery from false busy state on concurrent attach
operation.

The procedure of attach operation is as below.
1) Find an unused port in /sys/devices/platform/vhci_hcd/status.
(userspace)
2) Request attach found port to driver through
/sys/devices/platform/vhci_hcd/attach. (userspace)
3) Lock table, reserve requested port and unlock table. (vhci driver)

Attaching more than one remote devices concurrently, same unused port
number will be found in step-1. Then one request will succeed and
others will fail even though there are some unused ports.

With this patch, driver returns EBUSY when requested port has already
been used. In this case, attach command retries from step-1: finding
another unused port. If there's no unused port, the attach operation
will fail in step-1. Otherwise it retries automatically using another
unused port.

vhci-hcd's interface (only errno) is changed as following.

Current	errno	New errno	Condition
EINVAL		same as left	specified port number is in invalid
				range
EAGAIN		same as left	platform_get_drvdata() failed
EINVAL		same as left	specified socket fd is not valid
EINVAL		EBUSY		specified port status is not free

The errno EBUSY was not used in userspace
src/usbip_attach.c:import_device(). It is needed to distinguish the
condition to be able to retry from other unrecoverable errors.

It is possible to avoid this failure by introducing userspace exclusive
control. But it's exaggerated for this special condition. The locking
itself has done in driver.
As an alternate solution, userspace doesn't specify port number, driver
searches unused port and it returns port number to the userspace. With
this solution, the interface is much different than this patch.

Signed-off-by: Nobuo Iwata <nobuo.iwata@fujixerox.co.jp>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-08-31 18:08:45 +02:00
..
doc usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
libsrc usbip: vhci-hcd: Add USB3 SuperSpeed support 2017-06-13 10:51:10 +02:00
src usbip: auto retry for concurrent attach 2017-08-31 18:08:45 +02:00
vudc tools: usb: usbip: Add simple script to show how to setup vUDC 2017-01-10 17:00:41 +01:00
.gitignore usbip: add missing compile time generated files to .gitignore 2016-12-06 08:37:41 +01:00
AUTHORS usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
COPYING usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
INSTALL usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
Makefile.am usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
README usb: fix some references for /proc/bus/usb 2017-04-18 16:54:19 +02:00
autogen.sh usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
cleanup.sh usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00
configure.ac usbip: move usbip userspace code out of staging 2014-08-25 10:38:56 -07:00

README

#
# README for usbip-utils
#
# Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
#               2005-2008 Takahiro Hirofuchi

[Overview]
USB/IP protocol allows to pass USB device from server to client over the
network. Server is a machine which provides (shares) a USB device. Client is
a machine which uses USB device provided by server over the network.
The USB device may be either physical device connected to a server or
software entity created on a server using USB gadget subsystem.
Whole project consists of four parts:

    - usbip-vhci
        A client side kernel module which provides a virtual USB Host Controller
        and allows to import a USB device from a remote machine.

    - usbip-host (stub driver)
        A server side module which provides a USB device driver which can be
        bound to a physical USB device to make it exportable.

    - usbip-vudc
        A server side module which provides a virtual USB Device Controller and allows
        to export a USB device created using USB Gadget Subsystem.

    - usbip-utils
        A set of userspace tools used to handle connection and management.
        Used on both sides.

[Requirements]
    - USB/IP device drivers
        Found in the drivers/usb/usbip/ directory of the Linux kernel tree.

    - libudev >= 2.0
	libudev library

    - libwrap0-dev
	tcp wrapper library

    - gcc >= 4.0

    - libtool, automake >= 1.9, autoconf >= 2.5.0, pkg-config

[Optional]
    - hwdata
        Contains USB device identification data.


[Install]
    0. Generate configuration scripts.
	$ ./autogen.sh

    1. Compile & install the userspace utilities.
	$ ./configure [--with-tcp-wrappers=no] [--with-usbids-dir=<dir>]
	$ make install

    2. Compile & install USB/IP drivers.


[Usage]
On a server side there are two entities which can be shared.
First of them is physical usb device connected to the machine.
To make it available below steps should be executed:

    server:# (Physically attach your USB device.)

    server:# insmod usbip-core.ko
    server:# insmod usbip-host.ko

    server:# usbipd -D
	- Start usbip daemon.

    server:# usbip list -l
	- List driver assignments for USB devices.

    server:# usbip bind --busid 1-2
	- Bind usbip-host.ko to the device with busid 1-2.
	- The USB device 1-2 is now exportable to other hosts!
	- Use `usbip unbind --busid 1-2' to stop exporting the device.

Second of shareable entities is USB Gadget created using USB Gadget Subsystem
on a server machine. To make it available below steps should be executed:

    server:# (Create your USB gadget)
        - Currently the most preferable way of creating a new USB gadget
          is ConfigFS Composite Gadget. Please refer to its documentation
          for details.
        - See vudc_server_example.sh for a short example of USB gadget creation

    server:# insmod usbip-core.ko
    server:# insmod usbip-vudc.ko
        - To create more than one instance of vudc use num module param

    server:# (Bind gadget to one of available vudc)
        - Assign your new gadget to USB/IP UDC
        - Using ConfigFS interface you may do this simply by:
            server:# cd /sys/kernel/config/usb_gadget/<gadget_name>
            server:# echo "usbip-vudc.0" > UDC

    server:# usbipd -D --device
        - Start usbip daemon.

To attach new device to client machine below commands should be used:

    client:# insmod usbip-core.ko
    client:# insmod vhci-hcd.ko

    client:# usbip list --remote <host>
	- List exported USB devices on the <host>.

    client:# usbip attach --remote <host> --busid 1-2
	- Connect the remote USB device.
	- When using vudc on a server side busid is really vudc instance name.
	  For example: usbip-vudc.0

    client:# usbip port
	- Show virtual port status.

    client:# usbip detach --port <port>
	- Detach the USB device.


[Example]
---------------------------
	SERVER SIDE
---------------------------
Physically attach your USB devices to this host.

    trois:# insmod path/to/usbip-core.ko
    trois:# insmod path/to/usbip-host.ko
    trois:# usbipd -D

In another terminal, let's look up what USB devices are physically
attached to this host.

    trois:# usbip list -l
    Local USB devices
    =================
     - busid 1-1 (05a9:a511)
	     1-1:1.0 -> ov511

     - busid 3-2 (0711:0902)
	     3-2:1.0 -> none

     - busid 3-3.1 (08bb:2702)
	     3-3.1:1.0 -> snd-usb-audio
	     3-3.1:1.1 -> snd-usb-audio

     - busid 3-3.2 (04bb:0206)
	     3-3.2:1.0 -> usb-storage

     - busid 3-3 (0409:0058)
	     3-3:1.0 -> hub

     - busid 4-1 (046d:08b2)
	     4-1:1.0 -> none
	     4-1:1.1 -> none
	     4-1:1.2 -> none

     - busid 5-2 (058f:9254)
	     5-2:1.0 -> hub

A USB storage device of busid 3-3.2 is now bound to the usb-storage
driver. To export this device, we first mark the device as
"exportable"; the device is bound to the usbip-host driver. Please
remember you can not export a USB hub.

Mark the device of busid 3-3.2 as exportable:

    trois:# usbip --debug bind --busid 3-3.2
    ...
    usbip debug: usbip_bind.c:162:[unbind_other] 3-3.2:1.0 -> usb-storage
    ...
    bind device on busid 3-3.2: complete

    trois:# usbip list -l
    Local USB devices
    =================
    ...

     - busid 3-3.2 (04bb:0206)
	     3-3.2:1.0 -> usbip-host
    ...

---------------------------
	CLIENT SIDE
---------------------------
First, let's list available remote devices that are marked as
exportable on the host.

    deux:# insmod path/to/usbip-core.ko
    deux:# insmod path/to/vhci-hcd.ko

    deux:# usbip list --remote 10.0.0.3
    Exportable USB devices
    ======================
     - 10.0.0.3
	    1-1: Prolific Technology, Inc. : unknown product (067b:3507)
	       : /sys/devices/pci0000:00/0000:00:1f.2/usb1/1-1
	       : (Defined at Interface level) / unknown subclass / unknown protocol (00/00/00)
	       :  0 - Mass Storage / SCSI / Bulk (Zip) (08/06/50)

	1-2.2.1: Apple Computer, Inc. : unknown product (05ac:0203)
	       : /sys/devices/pci0000:00/0000:00:1f.2/usb1/1-2/1-2.2/1-2.2.1
	       : (Defined at Interface level) / unknown subclass / unknown protocol (00/00/00)
	       :  0 - Human Interface Devices / Boot Interface Subclass / Keyboard (03/01/01)

	1-2.2.3: OmniVision Technologies, Inc. : OV511+ WebCam (05a9:a511)
	       : /sys/devices/pci0000:00/0000:00:1f.2/usb1/1-2/1-2.2/1-2.2.3
	       : (Defined at Interface level) / unknown subclass / unknown protocol (00/00/00)
	       :  0 - Vendor Specific Class / unknown subclass / unknown protocol (ff/00/00)

	    3-1: Logitech, Inc. : QuickCam Pro 4000 (046d:08b2)
	       : /sys/devices/pci0000:00/0000:00:1e.0/0000:02:0a.0/usb3/3-1
	       : (Defined at Interface level) / unknown subclass / unknown protocol (00/00/00)
	       :  0 - Data / unknown subclass / unknown protocol (0a/ff/00)
	       :  1 - Audio / Control Device / unknown protocol (01/01/00)
	       :  2 - Audio / Streaming / unknown protocol (01/02/00)

Attach a remote USB device:

    deux:# usbip attach --remote 10.0.0.3 --busid 1-1
    port 0 attached

Show the devices attached to this client:

    deux:# usbip port
    Port 00: <Port in Use> at Full Speed(12Mbps)
	   Prolific Technology, Inc. : unknown product (067b:3507)
	   6-1 -> usbip://10.0.0.3:3240/1-1  (remote bus/dev 001/004)
	   6-1:1.0 used by usb-storage
			  /sys/class/scsi_device/0:0:0:0/device
			  /sys/class/scsi_host/host0/device
			  /sys/block/sda/device

Detach the imported device:

    deux:# usbip detach --port 0
    port 0 detached


[Checklist]
    - See 'Debug Tips' on the project wiki.
	- http://usbip.wiki.sourceforge.net/how-to-debug-usbip
    - usbip-host.ko must be bound to the target device.
	- See /sys/kernel/debug/usb/devices and find "Driver=..." lines of the device.
    - Target USB gadget must be bound to vudc
      (using USB gadget susbsys, not usbip bind command)
    - Shutdown firewall.
	- usbip now uses TCP port 3240.
    - Disable SELinux.
    - Check the kernel and daemon messages.


[Contact]
    Mailing List: linux-usb@vger.kernel.org