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xen-devel
[Xen-devel] Re: [PATCH] Fox for pcnet device model data corruption
On 25 Feb 2006, at 15:27, Kamble, Nitin A wrote:
The patch is letting the DM detect the receive ring full condition
in advance, so that packets will not be pushed to DM, in that
situation, and that si better because otherwise it is just going to
drop the packet and raise an error.
Yeh, the DM is checking for this condition in the pcnet_receive(),
to signal the OS driver that packets are dropped. But it is too late
because the OS driver handling for this situation does not work
properly for the DM.
Yes, it's a shame there's no supported device model of a decent NIC.
The pcnet one is not keeping up with qemu developments, and is
apparently buggy. It'll be a pain when we want to upgrade to a more
recent version of qemu too, although I think I've seen an upgraded
pcnet patch floating around (although not necessarily from anyone who
understands either the particular device model or qemu all that well).
-- Keir
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