netdev - Re: [PATCH net-next 13/13] bnxt_en: Make PTP TX timestamp HWRM query silent

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Date: Wed, 24 Jan 2024 20:47:03 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: Pavan Chebbi <pavan.chebbi@...adcom.com>
Cc: Breno Leitao <leitao@...ian.org>, davem@...emloft.net, netdev@...r.kernel.org, 
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, gospo@...adcom.com
Subject: Re: [PATCH net-next 13/13] bnxt_en: Make PTP TX timestamp HWRM query silent

On Wed, Jan 24, 2024 at 7:35 PM Pavan Chebbi <pavan.chebbi@...adcom.com> wrote:
>
> On Wed, Jan 24, 2024 at 3:48 PM Breno Leitao <leitao@...ian.org> wrote:
> >
> > Hello Michael, Pavan,
> >
> > On Mon, Dec 11, 2023 at 04:51:22PM -0800, Michael Chan wrote:
> > > From: Pavan Chebbi <pavan.chebbi@...adcom.com>
> > >
> > > In a busy network, especially with flow control enabled, we may
> > > experience timestamp query failures fairly regularly. After a while,
> > > dmesg may be flooded with timestamp query failure error messages.
> > >
> > > Silence the error message from the low level hwrm function that
> > > sends the firmware message.  Change netdev_err() to netdev_WARN_ONCE()
> > > if this FW call ever fails.
> >
> > This is starting to cause a warning now, which is not ideal, because
> > this error-now-warning happens quite frequently in Meta's fleet.
> >
> > At the same time, we want to have our kernels running warninglessly.
> > Moreover, the call stack displayed by the warning doesn't seem to be
> > quite useful and doees not help to investigate "the problem", I _think_.
> >
> > Is it OK to move it back to error, something as:
> >
> > -       netdev_WARN_ONCE(bp->dev,
> > +       netdev_err_once(bp->dev,
> >                          "TS query for TX timer failed rc = %x\n", rc);
>
> Hi Breno, I think it is OK to change.
> Would you be submitting a patch for this?
>

Why not netdev_warn_once()?  It will just print a message at the
warning level without the stack trace.  I think we consider this
condition to be just a warning and not an error.  Thanks.

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