virtio specification: OOO completion of the xmit buffers in the networking device

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Rusty, hi!
I'd like to ask for a small clarification about the virtio spec.
The virtio specification is put the way that it allows the out-of-order completions in general. Although it states that it's mostly relevant to the virtio-blk it doesn't explicitly bans it for virtio networking devices (for generality?).

(AFAICS the current virtio HV implementations make sure there is no OOO Tx buffers completions).

I wonder if this feature (OOO Tx buffers completions) seems practical to u and if not can I hope that it could be clearly stated in the future virtio specification releases that it's forbidden?

thanks in advance,
vlad

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