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

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Date: Thu, 22 Feb 2024 10:38:53 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: 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>
Cc: 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 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?

Thanks!

Paolo