David Miller [off-list ref] writes:

From: Rusty Russell <redacted>
Date: Mon, 15 Jul 2013 11:13:25 +0930

quoted

From: Michael S. Tsirkin <mst@redhat.com>

For small packets we can simplify xmit processing
by linearizing buffers with the header:
most packets seem to have enough head room
we can use for this purpose.
Since existing hypervisors require that header
is the first s/g element, we need a feature bit
for this.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <redacted>

I really think this has to wait until the next merge window, sorry.

Please resubmit this when I open net-next back up, thanks.

Oh, assumed it was already open.    Will re-submit then.

Cheers,
Rusty.