netdev - RE: [PATCH net v2 1/4] net: wangxun: fix the incorrect display of queue number in statistics

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Date: Thu, 9 May 2024 10:39:22 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: "'Jakub Kicinski'" <kuba@...nel.org>
Cc: <davem@...emloft.net>,
	<edumazet@...gle.com>,
	<pabeni@...hat.com>,
	<rmk+kernel@...linux.org.uk>,
	<andrew@...n.ch>,
	<netdev@...r.kernel.org>,
	<mengyuanlou@...-swift.com>,
	<duanqiangwen@...-swift.com>
Subject: RE: [PATCH net v2 1/4] net: wangxun: fix the incorrect display of queue number in statistics

On Wed, May 1, 2024 10:00 AM, Jakub Kicinski wrote:
> On Mon, 29 Apr 2024 18:25:16 +0800 Jiawen Wu wrote:
> > When using ethtool -S to print hardware statistics, the number of
> > Rx/Tx queues printed is greater than the number of queues actually
> > used.
> 
> The ethtool API fetches the number of stats and the values in an
> unsafe, non-atomic way. If someone increases the number of queues
> while someone else is fetching the stats the memory of the latter
> process will get corrupted. The code is correct as is.

So should we keep the old code, showing stats with fixed maximum
number of queues?