[Xen-users] RE: DMA Crash when I test GPL Windows PV Driver by iperf

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> Hey All,
> 
> When I did a test of GPL Windows PV Driver on Windows XP SP2 by iperf,
I found
> a DMA Crash.
> And the Crash occurs every times.
> The test is as following:
> I install GPL Windows PV Driver (0.10.0.130) for XP as DomU , and Suse
11 as
> Dom0 on Xen 3.3.1.
> When I set DomU as iperf's Client and Dom0 as Server.
> 
> iperf client on DomU (XP):
> iperf -c $SERVER_IP -i 1 -l 1 -w 64k
> iperf server on Dom0 (Suse 11 & xen 3.3.1)
> iperf -s -l 1 l -w 64k
> 
> Scatter/gather enabled
> 
> IF I SET -l (buff size ) as 1 byte ( in fact from 1 byte to 9 bytes),
the DomU
> (XP) crashed everything (Scatter/gather enabled).
> 
> I use windbg to analyze the Windows Mem Dump, I found the crash
callstack  as
> following:
> 
> XenNet_RxBufferCheck() -> ... ->  XenPci_DOP_BuildScatterGatherList()
->
> XenPci_DOP_BuildScatterGatherListButDontExecute()
> 
>         for (i = 0; remaining > 0; i++)
>         {
>           pfn = MmGetMdlPfnArray(curr_mdl)[pfn_offset + i];
>           ASSERT(pfn);
>           gref = (grant_ref_t)GntTbl_GrantAccess(xpdd, 0, (ULONG)pfn,
FALSE,
> INVALID_GRANT_REF);
>           ASSERT(gref != INVALID_GRANT_REF); // gref gets a value of
> INVALID_GRANT_REF, Crash occurs!!!
>           sglist->Elements[sg_element].Address.QuadPart =
(LONGLONG)(gref <<
> PAGE_SHIFT) | offset;
>           sglist->Elements[sg_element].Length = min(min(PAGE_SIZE -
offset,
> remaining), total_remaining);
>           total_remaining -= sglist->Elements[sg_element].Length;
>           remaining -= sglist->Elements[sg_element].Length;
>           offset = 0;
>           sg_element++;
>         }
> I donot know how to fix it.
> I think the Satter/Gather is related to transfer NOT receive, why
crash when
> receving data.
> because of  -l set as 1 byte, then using more gref to store outgoing
data, and
> gref is NOT enough?
> 
> pls have a look at this problem.
> 

Do you have the full stack trace?

James

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