Re: [PATCH RFC v1] libxl: Introduce a template for devices with a controller

[Juergen Gross <jgross@suse.com>]

On 05/21/2015 07:07 PM, George Dunlap wrote:
> We have several outstanding patch series which add devices that have
> two levels: a controller and individual devices attached to that
> controller.
>
> In the interest of consistency, this patch introduces a section that
> sketches out a template for interfaces for such devices.
>
> Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
> ---
> CC: Ian Campbell <ian.campbell@citrix.com>
> CC: Ian Jackson <ian.jackson@citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>
> CC: Juergen Gross <jgross@suse.com>
> CC: Chun Yan Liu <cyliu@suse.com>
> CC: Olaf Hering <olaf@aepfle.de>
>
> So, this is definitely RFC -- I tried to spec things out in a way that
> made sense, but I often just chose something that I thought would be a
> sensible starting point for discussion.
>
> This spec looks a lot more like the PVUSB spec than the PVSCSI spec,
> in part because I think the PVUSB spec has already had a lot more
> thought that's gone into it.
>
> A couple of random points to discuss:
>
> * Calling things "controllers", using <type>ctrl for the device name,
>    and using "ctrl" as the field name for the devid of the controller
>    in the individual devices.

Hmm, what about "device group" (<type>devgoup)? In the scsi world
"controller" would be one level higher in the hierarchy. And the scsi
controller is at least visible in the configuration syntax "h:c:t:l".
Using "controller" for the "c" in this item and for the "t" internally
could lead to confusion.


Juergen