* herbert@xxxxxxxxxxxxxxxxxxx [2006年12月09日 01:13:26]
> David Edmondson <dme@xxxxxxx> wrote:
>> The inter-domain protocol has no facility to allow the guest to
>> specify the offset at which the checksum should be placed - how does
>> the peer know where to put it?
>
> When I extended the netback protocol for TSO the idea was that you
> can also have an extra descriptor for checksum offload that would
> carry the offsets.
But that offset is not present today, suggesting that the peer
receiving the packet must be parsing it to determine where to place
the checksum (though I couldn't find that code in a quick inspection).
If the receiver of the packet is required to parse it we're back at
the problem I originally described.
The GSO feature flags are quite specific about what is supported -
checksum feature flags should be the same.
dme.
-- 
David Edmondson, Sun Microsystems, http://www.dme.org
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