netdev - Re: [PATCH V6 net-next 3/4] net: hns3: dump more reg info based on ras mod

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Date: Sat, 30 Mar 2024 10:35:51 +0800
From: Jijie Shao <shaojijie@...wei.com>
To: Jakub Kicinski <kuba@...nel.org>
CC: <shaojijie@...wei.com>, <yisen.zhuang@...wei.com>,
	<salil.mehta@...wei.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<pabeni@...hat.com>, <jiri@...nulli.us>, <horms@...nel.org>,
	<rkannoth@...vell.com>, <shenjian15@...wei.com>, <wangjie125@...wei.com>,
	<liuyonglong@...wei.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V6 net-next 3/4] net: hns3: dump more reg info based on
 ras mod


on 2024/3/29 23:15, Jakub Kicinski wrote:
> On Fri, 29 Mar 2024 18:34:02 +0800 Jijie Shao wrote:
>>> These seem to be duplicating standard stats from rtnl_link_stats64,
>>> ethtool_pause_stats, ethtool_eth_mac_stats, etc.
>>>
>>> You can add device specific stats, but please don't duplicate
>>> stats for which we have standard APIs.
>> Yeah, but these are not duplicate stats for ethtool or debugfs.
> Can you say more? I mean there are APIs to expose MIB counters.
> Perhaps your driver doesn't implement those APIs today.
> But (1) it should, and (2) once it does it will be a duplicate.

Sorry for the wrong reply before, these stats are already included
in the ethtool -S stats.

According to the suggestions provided by the chip, the statistics help
analyze the cause of the MAC-related abnormal interrupt.

>> Generally, driver will reset to restore the normal state.
>> After the reset, many registers are cleared. Therefore,
>> it is difficult to analyze the reason of RAS.
> Perhaps I'm missing the significance of the reset when it comes
> to counters reported via standard APIs. Are rtnl_link_stats64
> going to behave differently across a reset than these debug entries?
>
1. These statistics are the same as rtnl_link_stats64. However, these are not updated in real time.
    They are updated only when users query them or driver updates them every 5 minutes.
    However, these are cleared after the reset, which makes debugging difficult.
2. Currently, only a few MIB statistics are required, not all.
3. Are you suggesting that we use rtnl_link_stats64 to provide MIB statistics?

>> We wang to add this information only when RAS is occurring, And
>> these information will help to analyze the reason of RAS.
>>
>> these information does not appear in any new API.
>>
>> Therefore, we hope that we can add this information to
>> reduce the difficulty of analyzing certain issues.