Re: virtio-scsi spec (was Re: [PATCH] Add virtio-scsi to the virtio spec)

On 12/01/2011 10:52 AM, Hannes Reinecke wrote:

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I would like to have the other request_queue limitations exposed
here, too.
Most notably we're missing the maximum size of an individual segment
and the maximum size of the overall I/O request.

The virtio transport does not put any limit, as far as I know.

Virtio doesn't, but the underlying device/driver might.
And if we don't expose these values we cannot format the request correctly.

These limits should be per target/LUN, so it seems like material for 
another controlq command when the need arises.  For now, I'd really 
prefer to have the spec match the implementation (plus a few SAM 
bogosities).

Paolo