netdev - Re: [patch net-next v6_repost 2/3] net: core: add SW stats to if_stats

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Date:   Tue, 23 Aug 2016 08:53:18 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, nogahf@...lanox.com,
        idosch@...lanox.com, eladr@...lanox.com, yotamg@...lanox.com,
        ogerlitz@...lanox.com, nikolay@...ulusnetworks.com,
        linville@...driver.com, tgraf@...g.ch, gospo@...ulusnetworks.com,
        sfeldma@...il.com, sd@...asysnail.net, eranbe@...lanox.com,
        ast@...mgrid.com, edumazet@...gle.com, hannes@...essinduktion.org,
        f.fainelli@...il.com, dsa@...ulusnetworks.com
Subject: Re: [patch net-next v6_repost 2/3] net: core: add SW stats to
 if_stats_msg

Tue, Aug 23, 2016 at 07:51:57AM CEST, roopa@...ulusnetworks.com wrote:
>On 8/19/16, 6:17 AM, Jiri Pirko wrote:
>> From: Nogah Frankel <nogahf@...lanox.com>
>>
>> Add a nested attribute of SW stats to if_stats_msg
>> under IFLA_STATS_LINK_SW_64.
>>
>> Signed-off-by: Nogah Frankel <nogahf@...lanox.com>
>> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>>  include/uapi/linux/if_link.h |  1 +
>>  net/core/rtnetlink.c         | 21 +++++++++++++++++++++
>>  2 files changed, 22 insertions(+)
>>
>> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
>> index a1b5202..1c9b808 100644
>> --- a/include/uapi/linux/if_link.h
>> +++ b/include/uapi/linux/if_link.h
>> @@ -825,6 +825,7 @@ enum {
>>  	IFLA_STATS_LINK_64,
>>  	IFLA_STATS_LINK_XSTATS,
>>  	IFLA_STATS_LINK_XSTATS_SLAVE,
>> +	IFLA_STATS_LINK_SW_64,
>>  
>hate to sound like a broken record here...
>
>sorry, but like I have been saying throughout this patch series,
>i don't think I can ack a new attribute for so called 'software stats' at the
>same level as existing IFLA_STATS_LINK_64. It just adds ambiguity for existing stats and
>confusion for future stats.
>
>Today's IFLA_STATS64 or IFLA_STATS_LINK_64 provides aggregate stats
>and historically its been 'HW only' or 'SW only' or 'HW + SW'. It depends on the driver. logical devices
>provide pure 'SW only' stats here. There is no real reason to qualify them now. The user/app
>has only cared about and will continue to care about only aggregate stats. That requirement
>has never changed.
>
>Everything else is breakdown for debug-ability.., hence should be in this second bucket I
>have been talking about (these are traditionally available via ethtool today).
>
>I am not arguing against the value of the stats this patch series provides. But, since the beginning
>of the stats api, I have always talked about a nested extensible attribute for drivers who wish to
>break their stats down. so, I have only been requesting to put this so called 'software stats' attribute
>in a new nested attribute which can be extended for other such specially qualified stats.
>
>And, I thought we had agreed on such an attribute. I mention such a nested attribute
>here again on your previous post: http://marc.info/?l=linux-netdev&m=147085641703885&w=2

And Nogah replied.

Anyway I think that next level of nesting is not necessary. On
contrary, it is wrong. The current level is extensible, mixed and
flagged already. I don't see any reason why not to add whatever kind of
stats here. What makes IFLA_STATS_LINK_SW_64 or for example
IFLA_STATS_LINK_HW_ACL so special it has to be nested in some other
attr? I would understand it it would be values of one family, but that
is not the case.