linux-kernel - Re: [PATCH net v2] net: dlink: fix multicast stats being counted incorrectly

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Message-ID: <8f47407c-fb5b-4805-a95f-ca15d6eb7838@lunn.ch>
Date: Fri, 22 Aug 2025 17:15:31 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Yeounsu Moon <yyyynoom@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] net: dlink: fix multicast stats being counted
 incorrectly

On Fri, Aug 22, 2025 at 09:02:46PM +0900, Yeounsu Moon wrote:
> `McstFramesRcvdOk` counts the number of received multicast packets, and
> it reports the value correctly.
> 
> However, reading `McstFramesRcvdOk` clears the register to zero. As a
> result, the driver was reporting only the packets since the last read,
> instead of the accumulated total.
> 
> Fix this by updating the multicast statistics accumulatively instaed of
> instantaneously.
> 
> Fixes: 3401299a1b9e747cbf7de2cc0c8f6376c3cbe565 ("de6*/dl2k/sundance: Move the D-Link drivers")

The hash for fixes tends to be shorter than that.

Fixes: 3401299a1b9e ("de6*/dl2k/sundance: Move the D-Link drivers")

If you add this to your .git/config

[pretty]
        fixes = Fixes: %h (\"%s\")

You can do

git log --pretty=fixes 3401299a1b9e747cbf7de2cc0c8f6376c3cbe565
Fixes: 3401299a1b9e ("de6*/dl2k/sundance: Move the D-Link drivers")

This problem actually goes back further:

git blame 3401299a1b9e~1 drivers/net/dl2k.c

shows it was broken in the first commit in git.

So the correct Fixes: tag is:

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")

    Andrew

---
pw-bot: cr