[TriLUG] Xen, USB, & printers, oh my!

[Andrew Ball]

Very interesting.  I know there has been work going on with some sort of
USB virtualization for Xen, but using PCI pass through makes sense and
probably should work :-)

You'd probably have better look posting to xen-users at lists.xensource.com .

Please say which version of Xen you're using (xm info | grep changeset) .

Peace.
Andrew

On 8/20/06, Tanner Lovelace <clubjuggler at gmail.com> wrote:
>
> Greetings,
>
> I'm just starting to play around with xen and one of the
> first things I wanted to try to do was set up my print
> server in a dom.  (Mainly because I cannibalized the print
> server to turn into a xen server! :-)  Anyway, I've got
> xen setup on Debian Etch (very seamless except that
> I had to run initramfs on the linux xen kernel).  I've
> also got a dom setup (using xen-tools, also running
> debian etch) and it works fine.
>
> My next challenge was to get the dom to see the usb
> printer.  Kevin Otte helped me with my terminology
> and I found this web page
>
> http://www.wlug.org.nz/XenPciPassthrough
>
> which allowed me to let the dom see the usb printer.
> And, sure enough, if I cat /proc/bus/usb/devices I see this:
>
> T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=12  MxCh= 0
> D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
> P:  Vendor=03f0 ProdID=1204 Rev= 1.00
> S:  Manufacturer=Hewlett-Packard
> S:  Product=DeskJet 930C
> S:  SerialNumber=CN12F1Q05SJL
> C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  2mA
> I:  If#= 0 Alt= 0 #EPs= 2 Cls=07(print) Sub=01 Prot=01 Driver=(none)
> E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
> E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
> I:  If#= 0 Alt= 1 #EPs= 2 Cls=07(print) Sub=01 Prot=02 Driver=(none)
> E:  Ad=01(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
> E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
>
> So, the dom sees the printer connected to the
> usb port.  However, I then attempted to load
> the usblp module and got this error message:
>
> drivers/usb/class/usblp.c: out of memory for write buf
> usblp: probe of 1-2:1.0 failed with error -5
> usbcore: registered new driver usblp
> drivers/usb/class/usblp.c: v0.13: USB Printer Device Class driver
>
> Obviously the last 2 lines don't mean much but
> I can't find much of anything about the first line.
> If anyone can shed some light on this I'd really
> appreciate it.
>
> BTW, yes, I know it would be easy to go get a
> network print server.  However, that's not what
> I'm asking.  Any comments suggesting I do that
> will be summarily directed to /dev/null.  Thanks.
>
> Cheers,
> Tanner
>
>
> --
> Tanner Lovelace
> clubjuggler at gmail dot com
> http://wtl.wayfarer.org/
> (fieldless) In fess two roundels in pale, a billet fesswise and an
> increscent, all sable.
> --
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>



-- 
=======================
Andrew D. Ball
anball at gmail.com
http://filebox.vt.edu/~anball1/
"Festina lente" $\approx$ "Make haste slowly"
    -- Caesar Augustus