Re: [Xen-devel] PCI passthrough issue

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2011-02-04 at 11:25 +0000, Jean Baptiste Favre wrote:
> Hello,
> 
> Le 04/02/2011 12:04, Ian Campbell a Ãcrit :
> > On Fri, 2011-02-04 at 10:12 +0000, Jean Baptiste Favre wrote:
> >> Hello Ian,
> >> Applyed your patches.
> > 
> > Thanks.
> > 
> >> Now, I've:
> >> # ping -s86 10.0.0.1
> >> PING 10.0.0.1 (10.0.0.1): 86 data bytes
> >> __netif_receive_skb dropping skb proto 0x20
> >>
> >>
> >> So problem seems to occur in net/core/dev.c file, according to the patch
> >> bellow
> > 
> > Interesting. the number printed in the warning is type == skb->protocol
> > == 0x20 which is not a valid protocol that I can find anywhere (nor is
> > 0x2000 in case I'm mixing my endianesses up). Neither is 0x20 it a valid
> > Ethernet frame length (min 64) so it's not that sort of confusion
> > AFAICT.
> > 
> > skb->protocol is initialised in sky2_status_intr with the return value
> > of "eth_type_trans(skb, dev)" which as far as I can tell cannot return
> > 0x20.
> > 
> > The domU network configuration is using the sky2 device directly, no
> > bridging, VLAN, tunnels or anything else like that?
> At boot it uses bridge.
> For the test, I delete bridge and set IP address directly on eth0

OK, good.

[...]
> generic-segmentation-offload: on
[...]
> receive-hashing: on

Can you also try turning these two off (independently and together).

> What is a bit strange here is that I don't any more the KERN_CRIT printk
> message.
> Could be a false positive ?

Worth bearing in mind, lets see what the next test run produces.

> I'm currently compiling new kernel with your last patch. will keep you
> updated

Thanks.

Please gather the tcpdump's too.

Ian.



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