Re: [dpdk-dev] [PATCH v2 6/7] virtio: fix pci accesses for ppc64 in legacy mode

["Chao Zhu" <chaozhu@linux.vnet.ibm.com>]

Olivier,

The patch set looks good. I think little endian is good enough. We
internally decide to only support little endian previously. You can keep the
endian conversion such kind of things in the code.

-----Original Message-----
From: Olivier Matz [mailto:olivier.matz@6wind.com] 
Sent: 2016年5月20日 20:11
To: Chao Zhu <chaozhu@linux.vnet.ibm.com>; dev@dpdk.org
Cc: david.marchand@6wind.com; yuanhan.liu@linux.intel.com; huawei.xie@intel.
com
Subject: Re: [PATCH v2 6/7] virtio: fix pci accesses for ppc64 in legacy
mode

Hi Chao,

On 05/19/2016 11:13 AM, Chao Zhu wrote:
> Olivier,
> 
> Thanks for the patches! 
> Just one comment:
> POWER8 machine only supports little endian OS on bare metal. In VM 
> guest, it can support both little endian and big endian OS. Did you 
> try to run it on both host (little endian) and guest (big endian and
little endian)?

No I didn't test big endian in the guest.

I don't have any big endian VM image. Is it required for the test? I mean,
is it possible to run a big endian DPDK userland application on a little
endian kernel? (and if yes, is it known to work?)

Maybe I could replace in the patch:
  #ifdef RTE_ARCH_PPC_64
By something like :
  #if defined(RTE_ARCH_PPC_64) && (RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN)

If you have the ability to test it easily, it would be appreciated :)

Thanks for the review!
Olivier