[dpdk-stable] [PATCH] igb_uio: revert open and release operations

Patil, Harish Harish.Patil at cavium.com
Wed Oct 18 06:50:08 CEST 2017

-----Original Message-----
From: Thomas Monjalon <thomas at monjalon.net>
Date: Tuesday, October 17, 2017 at 1:33 PM
To: Ferruh Yigit <ferruh.yigit at intel.com>, Harish Patil
<Harish.Patil at cavium.com>
Cc: "dev at dpdk.org" <dev at dpdk.org>, Jianfeng Tan <jianfeng.tan at intel.com>,
Jingjing Wu <jingjing.wu at intel.com>, "Thotton, Shijith"
<Shijith.Thotton at cavium.com>, Gregory Etelson <gregory at weka.io>, George
Prekas <george.prekas at epfl.ch>, "stable at dpdk.org" <stable at dpdk.org>
Subject: Re: [PATCH] igb_uio: revert open and release operations

>17/10/2017 22:14, Ferruh Yigit:
>> There were bug reports about terminated application may leave device in
>> undesired state:
>> http://dpdk.org/ml/archives/dev/2016-November/049745.html
>> http://dpdk.org/ml/archives/dev/2016-November/050932.html
>> And a proposal to fix:
>> http://dpdk.org/ml/archives/dev/2016-December/051844.html
>> Later another proposal triggered the discussion:
>> http://dpdk.org/ml/archives/dev/2017-May/066317.html
>> Finally a fix patch pushed into v17.08:
>> Commit: b58eedfc7dd5 ("igb_uio: issue FLR during open and release of
>>device file")
>> Later a regression report sent related to the pushed patch:
>> http://dpdk.org/ml/archives/dev/2017-September/075236.html
>> And a fix for regression integrated into v17.11-rc1:
>> http://dpdk.org/ml/archives/dev/2017-October/079166.html
>> Commit: 5f6ff30dc507 ("igb_uio: fix interrupt enablement after FLR in
>> Commit: 6b9ed026a870 ("igb_uio: fix build with kernel <= 3.17")
>> Even after the fix qede PMD reported to be broken:
>> http://dpdk.org/ml/archives/dev/2017-October/079359.html
>> So this patch reverts original fix and related commits. The related
>> igb_uio code part turns back to v17.05 base.
>> ---
>> It would be nice to solve this issue in LTS release, but being close to
>> the release and the error report without details makes it hard to work
>> more on this issue.
>With this revert, we are back to the original issue.
>We must really try the proposed solution.
>Harish, please describe your issue and think how it could be fixed.
>Jingjing made it work for i40e.
>I know it is less effort to request a simple revert.
>Please let's try to fix it once for all.

Hi Ferruh/Thomas,
I’m discussing it internally, so please hold on committing this patch till
I revert back to you.



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