linux-kernel - Re: [PATCH net] bnxt_en: Make PTP timestamp HWRM more silent

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Date: Thu, 25 Jan 2024 20:51:25 +0530
From: Pavan Chebbi <pavan.chebbi@...adcom.com>
To: Breno Leitao <leitao@...ian.org>
Cc: Michael Chan <michael.chan@...adcom.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>, gospo@...adcom.com, 
	"open list:BROADCOM BNXT_EN 50 GIGABIT ETHERNET DRIVER" <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] bnxt_en: Make PTP timestamp HWRM more silent

On Thu, Jan 25, 2024 at 8:23 PM Breno Leitao <leitao@...ian.org> wrote:
>
> On Thu, Jan 25, 2024 at 08:03:18PM +0530, Pavan Chebbi wrote:
> > On Thu, Jan 25, 2024 at 7:11 PM Breno Leitao <leitao@...ian.org> wrote:
> > >
> > > commit 056bce63c469 ("bnxt_en: Make PTP TX timestamp HWRM query silent")
> > > changed a netdev_err() to netdev_WARN_ONCE().
> > >
> > > netdev_WARN_ONCE() is it generates a kernel WARNING, which is bad, for
> > > the following reasons:
> > >
> > >  * You do not a kernel warning if the firmware queries are late
> > >  * In busy networks, timestamp query failures fairly regularly
> > >  * A WARNING message doesn't bring much value, since the code path
> > > is clear.
> > > (This was discussed in-depth in [1])
> > >
> > > Transform the netdev_WARN_ONCE() into a netdev_warn_once(), and print a
> > > more well-behaved message, instead of a full WARN().
> > >
> > >         bnxt_en 0000:67:00.0 eth0: TS query for TX timer failed rc = fffffff5
> > >
> > > [1] Link: https://lore.kernel.org/all/ZbDj%2FFI4EJezcfd1@gmail.com/
> > > Signed-off-by: Breno Leitao <leitao@...ian.org>
> >
> > LGTM, however, you may still need to add a proper fixes tag.
>
> Thanks. I didn't include a fix tag because it is not a fix per se, but,
> I can easily send a v2 if this is needed.

You have a point. But then in that case it should go to net-next, I think.
If you respin or otherwise,
Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>

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