Xen devel - Feb 2005 - madwifi, 2.6.10, 2.0testing.bk problem confirmed

madwifi is getting rx interrupts, and the packets it dumps are all zero.  
And, you get enough packets, and you can see the packets in other parts of
memory, at least before your machine crashes and burns :-)

So, I think my guess about bad PAs in the ring buffer is probably right. 

Anybody else out there using madwifi under 2.6.10 on xen? :-)

Anyway I''ll do a bit more digging, from madwifi code it looks like this
ought to work but ...

ron


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> 
> madwifi is getting rx interrupts, and the packets it dumps are all zero.  
> And, you get enough packets, and you can see the packets in other parts of
> memory, at least before your machine crashes and burns :-)
> 
> So, I think my guess about bad PAs in the ring buffer is probably right. 
> 
> Anybody else out there using madwifi under 2.6.10 on xen? :-)
> 
> Anyway I''ll do a bit more digging, from madwifi code it looks like
this
> ought to work but ...
It should be calling ''pci_map_single'' on the skb->data
area.

We should start seeing northbridge chipsets soon which will allow
Xen to trap this sort of badness.

Ian


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