Re: [Xen-devel] PV DomU running linux 3.17.3 causing xen-netback fatal error in Dom0

[Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>]

Hi,

Maybe I'm misreading it, but it seems to me that netfront doesn't slice 
up the linear buffer at all, just blindly sends it. In xennet_start_xmit:
unsigned int offset = offset_in_page(data);
unsigned int len = skb_headlen(skb);
...
tx->offset = offset;
tx->size = len;

Although in the slot counting it calculates it correctly:
DIV_ROUND_UP(offset + len, PAGE_SIZE)

Am I missing something?

Zoli

On 04/12/14 15:53, David Vrabel wrote:
> On 04/12/14 15:36, Anthony Wright wrote:
> > > On 01/12/14 14:22, David Vrabel wrote:
> > > This VIF protocol is weird. The first slot contains a txreq with a
> > > size
> > > for the total length of the packet, subsequent slots have sizes for
> > > that
> > > fragment only.
> > >
> > > netback then has to calculate how long the first slot is, by
> > > subtracting
> > > all the size from the following slots.
> > >
> > > So something has gone wrong but it's not obvious what it is. Any
> > > chance
> > > you can dump the ring state when it happens?
> > We think we've worked out how to dump the ring state, please see below.
> We need the full contents of the ring which isn't currently available
> via debugfs and I haven't had time to put together a debug patch to make
> it available.
>
> David
>
>
>
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