netdev - Re: Regression caused by commit 7bb05b85bc2d ("r8169: don't use MSI-X on RTL8106e")

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Message-Id: <BF554FD5-17BA-4F16-9FDF-705D1FC76C12@canonical.com>
Date:   Wed, 12 Sep 2018 16:19:39 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     jian-hong@...lessm.com, Linux Netdev List <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression caused by commit 7bb05b85bc2d ("r8169: don't use MSI-X
 on RTL8106e")

at 14:32, Thomas Gleixner <tglx@...utronix.de> wrote:

> On Wed, 12 Sep 2018, Kai-Heng Feng wrote:
>
>> There's a Dell machine with RTL8106e stops to work after S3 since the
>> commit introduced. So I am wondering if it's possible to revert the
>> commit and use DMI/subsystem id based quirk table?
>
> Probably.

Hopefully Jian-Hong can cook up a quirk table for the issue.

>
>> It's because of commit bc976233a872 ("genirq/msi, x86/vector: Prevent
>> reservation mode for non maskable MSI") cleared the reservation mode,  
>> and I
>> can see this after S3:
>>
>> [   94.872838] do_IRQ: 3.33 No irq handler for vector
>
> It's not because of that commit, really. There is a interrupt sent after
> resume to the wrong vector for whatever reason. The MSI vector cannot be
> masked it seems in the device, but the driver should quiescen the device to
> a point where it does not send interrupts.

Understood.

>
>> If the device uses MSI-X instead of MSI, the issue doesn't happen  
>> because of
>> reservation mode.
>
> Reservation mode has absolutely nothing to do with that. What prevents the
> issue is the fact that MSI-X can be masked by the IRQ core.

So in this case I think keep the device using MSI-X is a better route, it's  
MSI-X capable anyway.

>
>> Is it something should be handled by x86 BIOS? Because I don't see this  
>> issue
>> when I use Suspend-to-Idle, which doesn't use BIOS to do suspend.
>
> Suspend to idle works completely different and I don't see the BIOS at
> fault here. it's more an issue of MSI not being maskable on that device,
> which can't be fixed in BIOS or it's some half quiescened state which is
> used when suspending and that's a pure driver issue.

Understood.
Thanks for all the info!

Kai-Heng

>
> Thanks,
>
> 	tglx