From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Subject: Re: [PATCHv3 1/2] config/armv8a: disable igb_uio
Date: Thu, 12 May 2016 08:30:01 +0530
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Cc: Hemant Agrawal <hemant.agrawal@nxp.com>, <dev@dpdk.org>,
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To: Stephen Hemminger <stephen@networkplumber.org>
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On Wed, May 11, 2016 at 11:25:59AM -0700, Stephen Hemminger wrote:
> On Wed, 11 May 2016 22:32:16 +0530
> Jerin Jacob <jerin.jacob@caviumnetworks.com> wrote:
> 
> > On Wed, May 11, 2016 at 08:22:59AM -0700, Stephen Hemminger wrote:
> > > On Wed, 11 May 2016 19:17:58 +0530
> > > Hemant Agrawal <hemant.agrawal@nxp.com> wrote:
> > > 
> > > > IGB_UIO not supported for arm64 arch in kernel so disable.
> > > > 
> > > > Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
> > > > Reviewed-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
> > > 
> > > Really, I have use IGB_UIO on ARM64
> > 
> > May I know what is the technical use case for igb_uio on arm64
> > which cannot be addressed through vfio or vfioionommu.
> 
> I was running on older kernel which did not support vfioionommu mode.

That way if we see older and latest kernel does not have ibg_uio(due to
sysfs mmap issue) support .If you are back-porting the changes
I recommend to back port vfioionommu changes to old kernel.

If it comes to out of tree then dpdk out of tree configuration can also set
CONFIG_RTE_EAL_IGB_UIO or even while configuring dpdk.

IMO, It is better to keep arm64 dpdk.org changes inline with
upstream arm64 linux kernel changes.

What do you think?