linux-kernel - Re: [Intel-wired-lan] [PATCH] ice/ptp: fix the PTP worker retrying indefinitely if the link went down

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Message-ID: <820cf397-a99e-44d4-cf9e-3ad6876e4d06@intel.com>
Date:   Wed, 18 Jan 2023 14:22:43 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Daniel Vacek <neelx@...hat.com>
CC:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        "Kolacinski, Karol" <karol.kolacinski@...el.com>,
        Siddaraju <siddaraju.dh@...el.com>,
        "Michalik, Michal" <michal.michalik@...el.com>,
        <netdev@...r.kernel.org>, <intel-wired-lan@...ts.osuosl.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH] ice/ptp: fix the PTP worker retrying
 indefinitely if the link went down



On 1/18/2023 2:11 PM, Daniel Vacek wrote:
> On Wed, Jan 18, 2023 at 9:59 PM Jacob Keller <jacob.e.keller@...el.com> wrote:
>> On 1/18/2023 7:14 AM, Daniel Vacek wrote:
>> 1) request tx timestamp
>> 2) timestamp occurs
>> 3) link goes down while processing
> 
> I was thinking this is the case we got reported. But then again, I'm
> not really experienced in this field.
> 

I think it might be, or at least something similar to this.

I think that can be fixed with the link check you added. I think we
actually have a copy of the current link status in the ice_ptp or
ice_ptp_tx structure which could be used instead of having to check back
to the other structure.

I'm just hoping not to re-introduce bugs related to the hardware
interrupt counter that we had which results in preventing all future
timestamp interrupts.

> --nX
> 
>> 1) link down
>> 2) request tx timestamp rejected
>>
>> Thanks!
>>
>> -Jake
>