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Date:      Tue, 10 Nov 2020 09:35:27 +0000
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From: Ryan Stone <rysto32@gmail.com>
Date: Tue, 10 Nov 2020 11:02:38 -0500
Message-ID: <CAFMmRNycGwWzo9h0LLxhhNWDutER64Zvowu9yg+v7Zvx4sGJUQ@mail.gmail.com>
Subject: Re: iflib tx watchdog doesn't appear that it can work anymore
To: Eric Joyner <erj@freebsd.org>
Cc: freebsd-net <freebsd-net@freebsd.org>, Piotr.Pietruszewski@intel.com
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We hit the bug of the watchdog firing on idle NICs and were working on
merging r356310 into our tree when we noticed the problem through code
inspection.  I don't think that it's really a bug with r356310, just a
latent one that has become exposed.

On Mon, Nov 9, 2020 at 2:48 PM Eric Joyner <erj@freebsd.org> wrote:
>
> I'll add Piotr, the author of your linked patch, to this thread.
>
> Are you seeing a problem connected to the watchdog? Piotr tells me that IFLIB_QUEUE_WORKING isn't used now, but it wasn't even used before his patch.
>
> - Eric
>
> On Wed, Nov 4, 2020 at 8:47 AM Ryan Stone <rysto32@gmail.com> wrote:
>>
>> https://svnweb.freebsd.org/base?view=revision&revision=356310
>>
>> As of r356310, there does not appear to be a way that ift_qstatus can
>> be set to anything but IFLIB_QUEUE_IDLE.  As a result, I don't see
>> that there is any way for the watchdog to ever fire.
>>
>> I think that iflib has missed setting ift_qstatus to
>> IFLIB_QUEUE_WORKING when packets are enqueued on the rx ring.
>> _______________________________________________
>> freebsd-net@freebsd.org mailing list
>> https://lists.freebsd.org/mailman/listinfo/freebsd-net
>> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"



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