netdev - Re: [PATCH] igc: Avoid possible deadlock during suspend/resume

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Message-ID: <87wnk8qrt8.fsf@intel.com>
Date:   Mon, 13 Dec 2021 10:32:19 -0800
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Stefan Dietrich <roots@....de>,
        Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     kuba@...nel.org, greg@...ah.com, netdev@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, regressions@...ts.linux.dev
Subject: Re: [PATCH] igc: Avoid possible deadlock during suspend/resume

Hi Stefan,

Stefan Dietrich <roots@....de> writes:

> Hi Vinicius,
>
> thanks a lot - that patch fixed it! Both "normal" shutdown as well as
> ifdown/ifup are working without issues now if CONFIG_PCIE_PTM is
> enabled in the kernel config.

Great!

This patch is mostly to give us time to investigate, this seems to be an
issue related to that specific i225 model. I have to track one down and
perhaps talk to the hardware folks and see what I am doing wrong.

>
> I've done a DSL download/upload speed comparison against my current
> 5.14.0-19.2 and did not see any performance differences outside margin
> of error. I currently have no other Linux machine I could use for iperf
> but I will report if I encounter any issues.
>

I wasn't expecting any changes in performance, I was more asking if you
had some use case for PCIe PTM, and something stopped working. It seems
that the answer is no. That's good.

> As I am not familiar with the kernel development procedure: can you
> give a rough estimate when we may expect this patch in the stable
> branch?

I will write a useful commit message, take another closer look to see if
I am still missing something and propose the patch upstream. From there
until it's accepted in a stable tree, I guess it could take a few days,
a week, perhaps.

>
>
> Thanks again,
> Stefan
>
>
>
> On Fri, 2021-12-10 at 16:41 -0800, Vinicius Costa Gomes wrote:
>> Hi Stefan,
>>
>> Stefan Dietrich <roots@....de> writes:
>>
>> > Agreed and thanks for the pointers; please see the log files and
>> > .config attached as requested.
>> >
>>
>> Thanks for the logs.
>>
>> Very interesting that the initialization of the device is fine, so
>> it's
>> something that happens later.
>>
>> Can you test the attached patch?
>>
>> If the patch works, I would also be interested if you notice any loss
>> of
>> functionality with your NIC. (I wouldn't think so, as far as I know,
>> i225-V models have PTM support but don't have any PTP support).
>>
>> > Cheers,
>> > Stefan
>> >
>> >
>> > On Fri, 2021-12-10 at 15:01 +0100, Thorsten Leemhuis wrote:
>> > > On 10.12.21 14:45, Stefan Dietrich wrote:
>> > > > thanks for keeping an eye on the issue. I've sent the files in
>> > > > private
>> > > > because I did not want to spam the mailing lists with them.
>> > > > Please
>> > > > let
>> > > > me know if this is the correct procedure.
>>
>> Cheers,
>

Cheers,
-- 
Vinicius