netdev - Re: [PATCH 0/3] virtio-net: inline header support

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Message-ID: <506E9075.6000104@redhat.com>
Date:	Fri, 05 Oct 2012 09:47:01 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Anthony Liguori <anthony@...emonkey.ws>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Thomas Lendacky <tahm@...ux.vnet.ibm.com>,
	Sasha Levin <levinsasha928@...il.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 0/3] virtio-net: inline header support

Il 04/10/2012 09:44, Rusty Russell ha scritto:
> -In particular, no implementation should use the descriptor
> -boundaries to determine the size of any header in a request.[footnote:
> -The current qemu device implementations mistakenly insist that
> -the first descriptor cover the header in these cases exactly, so
> -a cautious driver should arrange it so.
> +[footnote:
> +It was previously asserted that framing should be independent of
> +message contents, yet invariably drivers layed out messages in
> +reliable ways and devices assumed it. In addition, the
> +specifications for virtio_blk and virtio_scsi require intuiting
> +field lengths from frame boundaries.
>  ]

Not true for virtio_scsi...

Paolo
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