netdev - Re: [patch net-next v10 0/3] return offloaded stats as default and expose original sw stats

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Message-Id: <20160919.005646.2094585553294775889.davem@davemloft.net>
Date:   Mon, 19 Sep 2016 00:56:46 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jiri@...nulli.us
Cc:     netdev@...r.kernel.org, nogahf@...lanox.com, idosch@...lanox.com,
        eladr@...lanox.com, yotamg@...lanox.com, ogerlitz@...lanox.com,
        roopa@...ulusnetworks.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 v10 0/3] return offloaded stats as default and
 expose original sw stats

From: Jiri Pirko <jiri@...nulli.us>
Date: Fri, 16 Sep 2016 15:05:35 +0200

> The problem we try to handle is about offloaded forwarded packets
> which are not seen by kernel. Let me try to draw it:
> 
>     port1                       port2 (HW stats are counted here)
>       \                          /
>        \                        /
>         \                      /
>          --(A)---- ASIC --(B)--
>                     |
>                    (C)
>                     |
>                    CPU (SW stats are counted here)
> 
> 
> Now we have couple of flows for TX and RX (direction does not matter here):
> 
> 1) port1->A->ASIC->C->CPU
> 
>    For this flow, HW and SW stats are equal.
> 
> 2) port1->A->ASIC->C->CPU->C->ASIC->B->port2
> 
>    For this flow, HW and SW stats are equal.
> 
> 3) port1->A->ASIC->B->port2
> 
>    For this flow, SW stats are 0.
> 
> The purpose of this patchset is to provide facility for user to
> find out the difference between flows 1+2 and 3. In other words, user
> will be able to see the statistics for the slow-path (through kernel).
 ...

Series applied, thanks Jiri.