linux-kernel - Re: [PATCH net] net: natsemi: fix `rx_dropped` double accounting on `netif

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Message-ID: <20250912132123.GB30363@horms.kernel.org>
Date: Fri, 12 Sep 2025 14:21:23 +0100
From: Simon Horman <horms@...nel.org>
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] net: natsemi: fix `rx_dropped` double accounting on
 `netif_rx()` failure

On Thu, Sep 11, 2025 at 02:33:06PM +0900, Yeounsu Moon wrote:
> `netif_rx()` already increments `rx_dropped` core stat when it fails.
> The driver was also updating `ndev->stats.rx_dropped` in the same path.
> Since both are reported together via `ip -s -s` command, this resulted
> in drops being counted twice in user-visible stats.
> 
> Keep the driver update on `skb_put()` failure, but skip it after
> `netif_rx()` errors.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Yeounsu Moon <yyyynoom@...il.com>

Thanks for your patch,

Thinking out loud: Adding use of ndev->stats to drivers that don't already
do so is discouraged. But here, an existing use is being fixed. And I agree
it is a fix. So this looks good to me.

Reviewed-by: Simon Horman <horms@...nel.org>