netdev - Re: [PATCH v2] net: stmmac: mmc_core: Drop interrupt registers from stats

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Message-ID: <20240222102808.GY22484@axis.com>
Date: Thu, 22 Feb 2024 11:28:08 +0100
From: Jesper Nilsson <jesper.nilsson@...s.com>
To: Paolo Abeni <pabeni@...hat.com>
CC: Jesper Nilsson <jesper.nilsson@...s.com>, 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 v2] net: stmmac: mmc_core: Drop interrupt registers from
 stats

On Thu, Feb 22, 2024 at 10:38:53AM +0100, Paolo Abeni wrote:
> On Tue, 2024-02-20 at 13:00 +0100, Jesper Nilsson wrote:
> > The MMC IPC interrupt status and interrupt mask registers are
> > of little use as Ethernet statistics, but incrementing counters
> > based on the current interrupt and interrupt mask registers
> > makes them actively misleading.
> > 
> > For example, if the interrupt mask is set to 0x08420842,
> > the current code will increment by that amount each iteration,
> > leading to the following sequence of nonsense:
> > 
> > mmc_rx_ipc_intr_mask: 969816526
> > mmc_rx_ipc_intr_mask: 1108361744
> > 
> > These registers have been included in the Ethernet statistics
> > since the first version of MMC back in 2011 (commit 1c901a46d57).
> > That commit also mentions the MMC interrupts as
> > "something to add later (if actually useful)".
> > 
> > If the registers are actually useful, they should probably
> > be part of the Ethernet register dump instead of statistics,
> > but for now, drop the counters for mmc_rx_ipc_intr and
> > mmc_rx_ipc_intr_mask completely.
> > 
> > Signed-off-by: Jesper Nilsson <jesper.nilsson@...s.com>
> 
> It looks like this could target the 'net' tree. Anyway it does not
> apply cleanly to 'net' nor 'net-next'. Could you please rebase &&
> repost, including Serge's tags and explicitly setting the target tree
> into the subj prefix?

Yeah, will do. My v1 patch applied cleanly to net-next,
but I didn't check the v2. My bad.

> Thanks!
> 
> Paolo

/^JN - Jesper Nilsson
-- 
               Jesper Nilsson -- jesper.nilsson@...s.com