[Xen-devel] Re: [PATCH] Fox for pcnet device model data corruption

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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