netdev - Re: [PATCH net-next RFC v4 04/15] devlink: Add reload actions stats to dev get

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Message-ID: <bd55e716-7659-c3c4-ded5-c0abbb3d37f3@nvidia.com>
Date:   Fri, 18 Sep 2020 19:13:59 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Jiri Pirko <jiri@...nulli.us>
CC:     Ido Schimmel <idosch@...sch.org>,
        Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next RFC v4 04/15] devlink: Add reload actions stats
 to dev get


On 9/15/2020 11:33 PM, Moshe Shemesh wrote:
> External email: Use caution opening links or attachments
>
>
> On 9/15/2020 4:34 PM, Jiri Pirko wrote:
>> Tue, Sep 15, 2020 at 02:31:38PM CEST, moshe@...dia.com wrote:
>>> On 9/15/2020 10:44 AM, Jiri Pirko wrote:
>>>> Tue, Sep 15, 2020 at 08:45:19AM CEST, idosch@...sch.org wrote:
>>>>> On Mon, Sep 14, 2020 at 03:45:00PM +0200, Jiri Pirko wrote:
>>>>>> Mon, Sep 14, 2020 at 08:07:51AM CEST, moshe@...lanox.com wrote:
>>>>>>> Expose devlink reload actions stats to the user through devlink dev
>>>>>>> get command.
>>>>>>>
>>>>>>> Examples:
>>>>>>> $ devlink dev show
>>>>>>> pci/0000:82:00.0:
>>>>>>>    reload_action_stats:
>>>>>>>      driver_reinit 2
>>>>>>>      fw_activate 1
>>>>>>>      driver_reinit_no_reset 0
>>>>>>>      fw_activate_no_reset 0
>>>>>>> pci/0000:82:00.1:
>>>>>>>    reload_action_stats:
>>>>>>>      driver_reinit 1
>>>>>>>      fw_activate 1
>>>>>>>      driver_reinit_no_reset 0
>>>>>>>      fw_activate_no_reset 0
>>>>>> I would rather have something like:
>>>>>>      stats:
>>>>>>        reload_action:
>>>>>>          driver_reinit 1
>>>>>>          fw_activate 1
>>>>>>          driver_reinit_no_reset 0
>>>>>>          fw_activate_no_reset 0
>>>>>>
>>>>>> Then we can easily extend and add other stats in the tree.
>>>
>>> Sure, I will add it.
>> Could you please checkout the metrics patchset and figure out how to
>> merge that with your usecase?
>>
>
> I will check, I will discuss with Ido how it will fit.
>

I have discussed it with Ido, it doesn't fit to merge with metrics:

1. These counters are maintained by devlink unlike metrics which are 
read by the driver from HW.

2. The metrics counters push string name, while here I use enum.

However, I did add another level as you suggested here for option to 
future stats that may fit.

>>>>>> Also, I wonder if these stats could be somehow merged with Ido's 
>>>>>> metrics
>>>>>> work:
>>>>>> https://github.com/idosch/linux/commits/submit/devlink_metric_rfc_v1
>>>>>>
>>>>>> Ido, would it make sense?
>>>>> I guess. My original idea for devlink-metric was to expose
>>>>> design-specific metrics to user space where the entity registering 
>>>>> the
>>>>> metrics is the device driver. In this case the entity would be 
>>>>> devlink
>>>>> itself and it would be auto-registered for each device.
>>>> Yeah, the usecase is different, but it is still stats, right.
>>>>
>>>>
>>>>>>> $ devlink dev show -jp
>>>>>>> {
>>>>>>>      "dev": {
>>>>>>>          "pci/0000:82:00.0": {
>>>>>>>              "reload_action_stats": [ {
>>>>>>>                      "driver_reinit": 2
>>>>>>>                  },{
>>>>>>>                      "fw_activate": 1
>>>>>>>                  },{
>>>>>>>                      "driver_reinit_no_reset": 0
>>>>>>>                  },{
>>>>>>>                      "fw_activate_no_reset": 0
>>>>>>>                  } ]
>>>>>>>          },
>>>>>>>          "pci/0000:82:00.1": {
>>>>>>>              "reload_action_stats": [ {
>>>>>>>                      "driver_reinit": 1
>>>>>>>                  },{
>>>>>>>                      "fw_activate": 1
>>>>>>>                  },{
>>>>>>>                      "driver_reinit_no_reset": 0
>>>>>>>                  },{
>>>>>>>                      "fw_activate_no_reset": 0
>>>>>>>                  } ]
>>>>>>>          }
>>>>>>>      }
>>>>>>> }
>>>>>>>
>>>>>> [..]