netdev - RE: [PATCH net 2/5] net: wangxun: fix error statistics when the device is reset

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Message-ID: <046501da961c$77f3fba0$67dbf2e0$@trustnetic.com>
Date: Wed, 24 Apr 2024 15:53:17 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: "'Andrew Lunn'" <andrew@...n.ch>
Cc: <davem@...emloft.net>,
	<edumazet@...gle.com>,
	<kuba@...nel.org>,
	<pabeni@...hat.com>,
	<rmk+kernel@...linux.org.uk>,
	<netdev@...r.kernel.org>,
	<mengyuanlou@...-swift.com>,
	<duanqiangwen@...-swift.com>
Subject: RE: [PATCH net 2/5] net: wangxun: fix error statistics when the device is reset

On Tue, April 16, 2024 10:56 PM, Andrew Lunn wrote:
> On Tue, Apr 16, 2024 at 02:29:49PM +0800, Jiawen Wu wrote:
> > Add flag for reset state to avoid reading statistics when hardware
> > is reset.
> 
> This explains the what, which you can also get by reading the code
> change. The commit message should also explain the why? What goes
> wrong if you read the statistics when the hardware is in reset? Do you
> get 42 for every statistic? Does the hardware lockup and the reset
> never completes?

I think I should discard this patch, and add the resetting flag to the patch 5/5 to avoid
device reset collision. Since wx_update_stats() is called in txgbe_disable_device() while
device is resetting. And I haven't found a situation that causes statistics confusion.