netdev - Re: [PATCH net-next] net: hns3: debugfs add dump tm info of nodes, priority and qset

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Date:   Thu, 21 Jan 2021 09:40:27 +0800
From:   Huazhong Tan <tanhuazhong@...wei.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <huangdaode@...wei.com>, <linuxarm@...neuler.org>,
        Guangbin Huang <huangguangbin2@...wei.com>
Subject: Re: [PATCH net-next] net: hns3: debugfs add dump tm info of nodes,
 priority and qset


On 2021/1/19 11:43, Jakub Kicinski wrote:
> On Tue, 19 Jan 2021 11:14:51 +0800 Huazhong Tan wrote:
>> On 2021/1/19 3:48, Jakub Kicinski wrote:
>>> On Mon, 18 Jan 2021 19:20:23 +0800 Huazhong Tan wrote:
>>>> On 2021/1/17 10:23, Jakub Kicinski wrote:
>>>>> On Fri, 15 Jan 2021 15:09:29 +0800 Huazhong Tan wrote:
>>>>>> From: Guangbin Huang <huangguangbin2@...wei.com>
>>>>>>
>>>>>> To increase methods to dump more tm info, adds three debugfs commands
>>>>>> to dump tm info of nodes, priority and qset. And a new tm file of debugfs
>>>>>> is created for only dumping tm info.
>>>>>>
>>>>>> Unlike previous debugfs commands, to dump each tm information, user needs
>>>>>> to enter two commands now. The first command writes parameters to tm and
>>>>>> the second command reads info from tm. For examples, to dump tm info of
>>>>>> priority 0, user needs to enter follow two commands:
>>>>>> 1. echo dump priority 0 > tm
>>>>>> 2. cat tm
>>>>>>
>>>>>> The reason for adding new tm file is because we accepted Jakub Kicinski's
>>>>>> opinion as link https://lkml.org/lkml/2020/9/29/2101. And in order to
>>>>>> avoid generating too many files, we implement write ops to allow user to
>>>>>> input parameters.
>>>>> Why are you trying to avoid generating too many files? How many files
>>>>> would it be? What's the size of each dump/file?
>>>> The maximum number of tm node, priority and qset are 8, 256,
>>>> 1280, if we create a file for each one, then there are 8 node
>>>> files, 256 priority files, 1280 qset files. It seems a little
>>>> bit hard for using as well.
>>> Would the information not fit in one file per type with multiple rows?
>> What you means is as below ?
>>
>> estuary:/debugfs/hns3/0000:7d:00.0$ cat qset
>>
>> qset id: 0
>> QS map pri id: 0
>> QS map link_vld: 1
>> QS schedule mode: dwrr
>> QS dwrr: 100
>>
>> qset id: 1
>> QS map pri id: 0
>> QS map link_vld: 0
>> QS schedule mode: sp
>> QS dwrr: 0
>>
>> ...
> I was thinking more like:
>
> ID	PRI	LINK_VLD	MODE	DWRR
> 0	0	1		dwrr	0
> 1	0	0		sp	0
> ...
>
>
> but the exact format is up to you.


It looks better.


>> For example, user want to query qset 1, then all qset info will be output,
> I hope you don't mean end user when you say _user_.  This is debugfs,
> it's intended for developers to debug issues and system dump to gather
> info at customer site.


yes


>> there are too many useless info.
>>
>> So we add an interface to designage the specified id for node, priority
>> or qset.
>>
>>> Can you show example outputs?
>>
>> here is the output of this patch.
>>
>> estuary:/debugfs/hns3/0000:7d:00.0$ echo dump qset 0 > tm
>> estuary:/debugfs/hns3/0000:7d:00.0$ cat tm
>> qset id: 0
>> QS map pri id: 0
>> QS map link_vld: 1
>> QS schedule mode: dwrr
>> QS dwrr: 100
> Thanks. Not that much info per entry, as expected. Single file should
> do nicely.

Ok.

Will send V2 to do that.

Thanks.

> .