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Date: Thu, 12 May 2016 10:01:05 +0800
Message-ID: <CAP4Qi39YnbOAv8ToaNjc7PnBf=ZDhD3Ofep4SFNnvNmrDBjquQ@mail.gmail.com>
From: Jianbo Liu <jianbo.liu@linaro.org>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Jerin Jacob <jerin.jacob@caviumnetworks.com>,
 Hemant Agrawal <hemant.agrawal@nxp.com>, dev@dpdk.org, 
 santosh.shukla@caviumnetworks.com, 
 Thomas Monjalon <thomas.monjalon@6wind.com>
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Subject: Re: [dpdk-dev] [PATCHv3 1/2] config/armv8a: disable igb_uio
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On 12 May 2016 at 02:25, Stephen Hemminger <stephen@networkplumber.org> 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.

As I said, most of DPDK developers are not kernel developers. They may
have their own kernel tree, and couldn't like to upgrade to latest
kernel.
They can choose to use or not use igb_uio when binding the driver. But
blindly disabling it in the base config seems unreasonable.