netdev - Re: [PATCH v2 0/3] devlink region trigger support

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Message-ID: <421f78c2-7713-b931-779e-dfe675fe5f53@huawei.com>
Date:   Mon, 13 Jan 2020 09:39:50 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Alex Vesker <valex@...lanox.com>, Jakub Kicinski <kubakici@...pl>
CC:     Jacob Keller <jacob.e.keller@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jiri@...nulli.us" <jiri@...nulli.us>
Subject: Re: [PATCH v2 0/3] devlink region trigger support

On 2020/1/13 5:18, Alex Vesker wrote:
> On 1/12/2020 10:45 PM, Jakub Kicinski wrote:
>> On Sat, 11 Jan 2020 09:51:00 +0800, Yunsheng Lin wrote:
>>>> regions can essentially be used to dump arbitrary addressable content. I
>>>> think all of the above are great examples.
>>>>
>>>> I have a series of patches to update and convert the devlink
>>>> documentation, and I do provide some further detail in the new
>>>> devlink-region.rst file.
>>>>
>>>> Perhaps you could review that and provide suggestions on what would make
>>>> sense to add there?  
>>> For the case of region for mlx4, I am not sure it worths the effort to
>>> document it, because Jiri has mention that there was plan to convert mlx4 to
>>> use "devlink health" api for the above case.
>>>
>>> Also, there is dpipe, health and region api:
>>> For health and region, they seems similar to me, and the non-essential
>>> difference is:
>>> 1. health can be used used to dump content of tlv style, and can be triggered
>>>    by driver automatically or by user manually.
>>>
>>> 2. region can be used to dump binary content and can be triggered by driver
>>>    automatically only.
>>>
>>> It would be good to merged the above to the same api(perhaps merge the binary
>>> content dumping of region api to health api), then we can resue the same dump
>>> ops for both driver and user triggering case.
>> I think there is a fundamental difference between health API and
>> regions in the fact that health reporters allow for returning
>> structured data from different sources which are associated with 
>> an event/error condition. That includes information read from the
>> hardware or driver/software state. Region API (as Jake said) is good
>> for dumping arbitrary addressable content, e.g. registers. I don't see
>> much use for merging the two right now, FWIW...

The point is that we are beginning to use health API for event/error
condition, right? Do we use health API or regions API to dump a arbitrary
addressable content when there is an event/error detected?

Also we may need to dump both a arbitrary addressable content and the
structured data when there is an event/error detected, the health API or
regions API can not do both, right?

It still seems it is a little confusing when deciding to use health or
regions API.

>>
> Totally agree with Jakub, I think health and region are different and
> each has its
> usages as mentioned above. Using words such as recovery and health for
> exposing
> registers doesn't sound correct. There are future usages I can think of
> for region if we
> will add the trigger support as well as the live region read.

health API already has "trigger support" now if region API is merged to
health API.

I am not sure I understand "live region" here, what is the usecase of live
region?

> 
> 
>