[Spice-devel] Announcing usbredir-0.3.2

[Alon Levy]

On Tue, Jan 03, 2012 at 05:11:09PM +0100, Hans de Goede wrote:
> Hi,
> 
> On 01/03/2012 04:52 PM, Alon Levy wrote:
> >On Tue, Jan 03, 2012 at 04:45:11PM +0100, Hans de Goede wrote:
> >>Hi,
> >>
> >>On 01/03/2012 04:36 PM, Alon Levy wrote:
> >>>On Tue, Jan 03, 2012 at 04:29:21PM +0100, Hans de Goede wrote:
> >>>>Hi All,
> >>>>
> >>>>I'm happy to announce a new official release of usbredir, version 0.3.2
> >>>>
> >>>>Changes:
> >>>>--------
> >>>>
> >>>>-Switched to automake/autoconf/libtool based make system (Christophe Fergeau)
> >>>>
> >>>>-usbredirparser:
> >>>>  -limited multi-thread safeness, see README.multi-thread
> >>>>  -extend the device_connect packet header with a device_version field
> >>>>   This new field is only send / received if both sides have the (new)
> >>>>   usb_redir_cap_connect_device_version capability.
> >>>
> >>>Not related to usbredir protocol specifically, but what is your intended
> >>>usage for both the version and the caps? only bump the version in
> >>>extreme cases (change of header, reuse of an existing message with a
> >>>different meaning) ?
> >>
> >>There is no version field! There is a free form version string used for logging
> >>the version (and type ie usbredirserver versus spice-gtk) of the peer. There
> >>is no machine checked version!
> >>
> >>So the intention is to always stay compatible, only adding new caps when
> >>necessary.
> >>
> >
> >Ok, that clarifies it, thanks. I don't believe I'm the only one to draw
> >this conclusion, since I can't find any documentation of this intended
> >use (looking at the commit adding device_version_bcd).
> >
> >Another question - where is the free form string you mention, I only see
> >uint16_t device_version_bcd.
> 
> Ah I understand the confusion now, this new field of the device_connect! message
"!" ?

> sends accross the version the SB device reports is its version in its USB device
> descriptor.
> 
> The free form version string is in the hello packet which each side sends as soon
> as the connection between the 2 sides is established. Note that there are
> 2 different levels of connected here:
> 1) The 2 sides of the usbredir channel are connected
> 2) A device is connected to the channel on the usb host side
> 
> When 1) is established both sides send a hello packet, when 2) happens
> a device_connect message is send from the usbredirhost to the usbredirguest
> (which can happen multiple times during the lifetime of 1).
> 

Ok. So I was looking at 2) and you were talking about 1). Thanks for the
explanation.

> Regards,
> 
> Hans
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