linux-kernel - Re: [PATCH net-next 07/11] net: hns3: adds debug messages to identify eth down cause

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Message-ID: <fa64d1c8-c851-46ac-71a7-5eabc2277e54@huawei.com>
Date:   Fri, 26 Jul 2019 10:33:50 +0800
From:   liuyonglong <liuyonglong@...wei.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Saeed Mahameed <saeedm@...lanox.com>
CC:     "tanhuazhong@...wei.com" <tanhuazhong@...wei.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "lipeng321@...wei.com" <lipeng321@...wei.com>,
        "yisen.zhuang@...wei.com" <yisen.zhuang@...wei.com>,
        "salil.mehta@...wei.com" <salil.mehta@...wei.com>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 07/11] net: hns3: adds debug messages to identify
 eth down cause

As Saeed said, we will use netif_msg_drv() which is default off, this
can be easily open with ethtool.
Thanks for your reply!

On 2019/7/26 9:28, Jakub Kicinski wrote:
> On Thu, 25 Jul 2019 21:59:08 +0000, Saeed Mahameed wrote:
>> I couldn't find any rules regarding what to put in kernel log, Maybe
>> someone can share ?. but i vaguely remember that the recommendation
>> for device drivers is to put nothing, only error/warning messages.
> 
> FWIW my understanding is also that only error/warning messages should
> be printed. IOW things which should "never happen".
> 
> There are some historical exceptions. Probe logs for instance may be
> useful, because its not trivial to get to the device if probe fails.
> 
> Another one is ethtool flashing, if it takes time we used to print into
> logs some message like "please wait patiently". But since Jiri added
> the progress messages in devlink that's no longer necessary.
> 
> For the messages which are basically printing the name of the function
> or name of the function and their args - we have ftrace.
> 
> That's my $0.02 :)
> 
> .
>