linux-kernel - Re: [PATCH] net: stmmac: mmc_core: Assign, don't add interrupt registers

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Date: Tue, 20 Feb 2024 11:51:00 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Jesper Nilsson <jesper.nilsson@...s.com>, Florian Fainelli
	 <f.fainelli@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
 <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Maxime
 Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org, 
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org,  linux-kernel@...r.kernel.org,
 kernel@...s.com
Subject: Re: [PATCH] net: stmmac: mmc_core: Assign, don't add interrupt
 registers

On Mon, 2024-02-19 at 11:40 +0100, Jesper Nilsson wrote:
> On Fri, Feb 16, 2024 at 09:13:51AM -0800, Florian Fainelli wrote:
> > So in premise I agree with the patch, that incrementing those is not the
> > right way to go about them. However these registers are currently provided
> > as part of the statistics set, but they should instead be accessed via the
> > register dumping method.
> 
> You mean extending the dump register code to dump the MAC Management Counter
> registers that are not counters?
> > From what I understand it's only the Rx and Tx interrupt and interrupt mask
> registers that aren't counters. Oh, and the MMC control register itself?
> 
> To be honest, I don't think their use can justify the code churn.
> 
> > In either case you will get at best a snapshot of those two registers at any
> > given time and I suppose this can help diagnose a stuck RX condition, but
> > not much more than that.
> 
> Yeah, their use is very doubtful. For me, they only introduce more nonsense
> data in my logs.
> 
> The Rx registers looks to have been added in the first version of the MMC
> back in 2011, but the Tx registers never was.
> In commit 1c901a46d57 Giuseppe mentions the MMC interrupts as something to
> add later (if actually useful).
> 
> So Serge's suggestion to drop the entries completely is actually quite attractive.

Please, go ahead and drop such entries.

Thank!

Paolo