On 07/09/2015 05:06 AM, Alex Elsayed wrote:
Alan Stern wrote:
On Mon, 6 Jul 2015, Jeremy White wrote:
Anything else fundamental to usbip that should inform the design of a
usbredir driver? usbip appears to be based off a 2004 vintage of
dummy_hcd. I'll look thoughtfully at the current dummy_hcd; please let
me know if there is anything else I should consider.
One thing that springs to mind is USB-3 streams. When dummy-hcd was
expanded to include USB-3, that was the major new ingredient.
Another thing that comes to mind is that the USB-IF has its own official
standard for this kind of thing now, called Media-Agnostic USB[1]. In
November of 2014 a driver[2] was posted, followed by a second version[3],
and it is apparently being refined inside Intel[4].
[1]
http://www.usb.org/developers/docs/devclass_docs/Media_Agnostic_USB_v1.0.zip
[2] http://thread.gmane.org/gmane.linux.kernel/1820297
[3] http://thread.gmane.org/gmane.linux.drivers.driver-project.devel/60498
[4] http://article.gmane.org/gmane.linux.drivers.driver-project.devel/60757
Thanks for the pointer, Alex.
I spent some time with the spec and their proposed code. It does seem
plausible that XSpice could use a mausb/usbredir protocol converter. So
if there was a mausb kernel module, I could potentially implement
support in XSpice in user space and not need a usbredir module.
I sent an email to the two developers at Intel to ask if there had been
any further progress and if I could collaborate with them. I have not
heard back.
The MA spec is substantial and seems well thought out. But the usbredir
protocol has the virtue of being relatively mature - it's 5 years old,
with code in daily use.
At this point it seems the best path forward is to continue work on the
usbredir kernel module, which I will do unless I get some new information.
Cheers,
Jeremy
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