netdev - Re: [PATCH net v3] net: dlink: fix multicast stats being counted incorrectly

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Message-ID: <c064f823-f271-4501-8a0f-dd1e2d89d045@lunn.ch>
Date: Sat, 23 Aug 2025 20:45:08 +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 v3] net: dlink: fix multicast stats being counted
 incorrectly

On Sun, Aug 24, 2025 at 03:29:24AM +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: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Tested-on: D-Link DGE-550T Rev-A3
> Signed-off-by: Yeounsu Moon <yyyynoom@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew