netdev - Re: [PATCH net 5/6] net: hns3: fix wrong print link down up

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Date: Mon, 31 Jul 2023 17:10:45 +0800
From: Jijie Shao <shaojijie@...wei.com>
To: Andrew Lunn <andrew@...n.ch>
CC: <yisen.zhuang@...wei.com>, <salil.mehta@...wei.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <shenjian15@...wei.com>, <wangjie125@...wei.com>,
	<liuyonglong@...wei.com>, <wangpeiyang1@...wei.com>,
	<netdev@...r.kernel.org>, <stable@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 5/6] net: hns3: fix wrong print link down up


on 2023/7/30 2:23, Andrew Lunn wrote:
>>      Now i wounder if you are fixing the wrong thing. Maybe you should be
>>      fixing the PHY so it does not report up and then down? You say 'very
>>      snall intervals', which should in fact be 1 second. So is the PHY
>>      reporting link for a number of poll intervals? 1min to 10 minutes?
>>
>>                Andrew
>>
>> Yes, according to the log records, the phy polls every second,
>> but the link status changes take time.
>> Generally, it takes 10 seconds for the phy to detect link down,
>> but occasionally it takes several minutes to detect link down,
> What PHY driver is this?
>
> It is not so clear what should actually happen with auto-neg turned
> off. With it on, and the link going down, the PHY should react after
> about 1 second. It is not supposed to react faster than that, although
> some PHYs allow fast link down notification to be configured.
>
> Have you checked 802.3 to see what it says about auto-neg off and link
> down detection?
>
> I personally would not suppress this behaviour in the MAC
> driver. Otherwise you are going to have funny combinations of special
> cases of a feature which very few people actually use, making your
> maintenance costs higher.
>
> 	    Andrew
Thanks for your suggestion, We are analyzing this issue in depth.