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

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Date: Thu, 25 Jan 2024 06:53:10 -0800
From: Breno Leitao <leitao@...ian.org>
To: Pavan Chebbi <pavan.chebbi@...adcom.com>
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 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.