linux-kernel - Re: [PATCH] net: stmmac: fix ethtool per-queue statistics

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Date: Fri, 5 Jan 2024 20:54:01 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Petr Tesarik <petr@...arici.cz>
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>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Jisheng Zhang <jszhang@...nel.org>,
	"open list:STMMAC ETHERNET DRIVER" <netdev@...r.kernel.org>,
	"moderated list:ARM/STM32 ARCHITECTURE" <linux-stm32@...md-mailman.stormreply.com>,
	"moderated list:ARM/STM32 ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: stmmac: fix ethtool per-queue  statistics

On Fri, Jan 05, 2024 at 07:10:24PM +0100, Petr Tesarik wrote:
> Fix per-queue statistics for devices with more than one queue.
> 
> The output data pointer is currently reset in each loop iteration,
> effectively summing all queue statistics in the first four u64 values.
> 
> The summary values are not even labeled correctly. For example, if eth0 has
> 2 queues, ethtool -S eth0 shows:
> 
>      q0_tx_pkt_n: 374 (actually tx_pkt_n over all queues)
>      q0_tx_irq_n: 23  (actually tx_normal_irq_n over all queues)
>      q1_tx_pkt_n: 462 (actually rx_pkt_n over all queues)
>      q1_tx_irq_n: 446 (actually rx_normal_irq_n over all queues)
>      q0_rx_pkt_n: 0
>      q0_rx_irq_n: 0
>      q1_rx_pkt_n: 0
>      q1_rx_irq_n: 0
> 
> While touching this code, change the pointer type to u64 and get rid of the
> weird pointer arithmetic.
> 
> Signed-off-by: Petr Tesarik <petr@...arici.cz>
> Fixes: 133466c3bbe1 ("net: stmmac: use per-queue 64 bit statistics where necessary")

Hi Petr

There are a few process things you are missing. Please take a look at

https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html

You need to indicate which tree this is for.

Additionally, your Signed-off-by comes last.

Patches for stable should ideally be minimal. And obviously correct. See:

https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

So the bits about changing the pointer type and removing the weird
arithmetic might be better suited for net-next, not net.

	      Andrew