[Spice-devel] error: No free USB channel

[i iordanov]

Hi Uri,

Thanks for the clarifications!

iordan

On Sun, Dec 26, 2021 at 6:20 AM Uri Lublin <ulublin at redhat.com> wrote:
>
> Hi iordan,
>
> On Sat, Dec 25, 2021 at 11:49 PM i iordanov <iiordanov at gmail.com> wrote:
> >
> > Hey Frediano,
> >
> > Thanks for responding - so I take it this is a server-side setting
> > (how many channels are attached to the VM)?
>
> Yes, the USB (usbredir) devices are defined in the VM configuration
> (likely via a libvirt domxml file).
> If you need more than 2 USB devices connected to the guest at the same
> time, add more
> such devices to your VM.
>
> >
> > Also, is there a spice-gtk API that may be used to obtain the number
> > of available USB channels at any given time? I.e. the UI of any client
> > application should have a way to inform the user how many "ports" are
> > still available at any point, right?
>
> Both remote-viewer (virt-viewer) and the spicy test tool use
> spice-gtk's usb device widget
> which has this information.
>
> Alternatively, you can get "free-channels" from spice-gtk's usb device manager
>
> Uri.
>
> >
> > Thanks!
> > iordan
> >
> > On Fri, Dec 24, 2021 at 4:05 AM Frediano Ziglio <freddy77 at gmail.com> wrote:
> > >
> > > Il giorno gio 23 dic 2021 alle ore 23:38 i iordanov <iiordanov at gmail.com> ha scritto:
> > >>
> > >> Hi guys,
> > >>
> > >> During my testing I've been unable to connect more than 2 USB devices
> > >> at a time - could you please help me figure out why that's happening?
> > >>
> > >> The backend starts returning error with message "No free USB channel",
> > >> but I can't see how to tune the number of USB channels available!
> > >>
> > >> 2021-12-23 15:27:52.608 29721-29760/com.iiordanov.aSPICE
> > >> D/android-service: connect_cb: start
> > >> 2021-12-23 15:27:52.608 29721-29760/com.iiordanov.aSPICE
> > >> I/android-service: connect_cb: successfully redirected device
> > >> 2021-12-23 15:28:00.499 29721-29760/com.iiordanov.aSPICE
> > >> D/android-service: connect_cb: start
> > >> 2021-12-23 15:28:00.499 29721-29760/com.iiordanov.aSPICE
> > >> I/android-service: connect_cb: successfully redirected device
> > >> 2021-12-23 15:28:03.582 29721-29760/com.iiordanov.aSPICE
> > >> D/android-service: connect_cb: start
> > >> 2021-12-23 15:28:03.582 29721-29760/com.iiordanov.aSPICE
> > >> E/android-service: connect_cb: failed to redirect device, error: No
> > >> free USB channel
> > >> 2021-12-23 15:28:06.385 29721-29760/com.iiordanov.aSPICE
> > >> D/android-service: connect_cb: start
> > >> 2021-12-23 15:28:06.385 29721-29760/com.iiordanov.aSPICE
> > >> E/android-service: connect_cb: failed to redirect device, error: No
> > >> free USB channel
> > >> 2021-12-23 15:28:08.634 29721-29760/com.iiordanov.aSPICE
> > >> D/android-service: connect_cb: start
> > >> 2021-12-23 15:28:08.634 29721-29760/com.iiordanov.aSPICE
> > >> E/android-service: connect_cb: failed to redirect device, error: No
> > >> free USB channel
> > >>
> > >> Your help is very appreciated.
> > >>
> > >> Thanks!
> > >> iordan
> > >>
> > >
> > > Hi,
> > >   this is expected. Every USB channel allow to attach one USB device. Is like having 2 physical USB ports on your computer. If you don't use an HUB you can attach only 2 USB physical devices. Currently there's no software USB hub so one USB device takes one USB channel and by default only 2 USB channels are attached to the VM.
> > >
> > > Frediano
> >
> >
> >
> > --
> > The conscious mind has only one thread of execution.
> >
>


-- 
The conscious mind has only one thread of execution.