netdev - Re: [PATCH net-next v2 0/8] ethtool: add pause frame stats

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Date:   Fri, 11 Sep 2020 17:07:24 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, mkubecek@...e.cz,
        michael.chan@...adcom.com, tariqt@...dia.com, saeedm@...dia.com,
        alexander.duyck@...il.com, andrew@...n.ch
Subject: Re: [PATCH net-next v2 0/8] ethtool: add pause frame stats

On Sat, 12 Sep 2020 02:49:32 +0300 Vladimir Oltean wrote:
> On Fri, Sep 11, 2020 at 04:28:45PM -0700, Jakub Kicinski wrote:
> > Hi!
> > 
> > This is the first (small) series which exposes some stats via
> > the corresponding ethtool interface. Here (thanks to the
> > excitability of netlink) we expose pause frame stats via
> > the same interfaces as ethtool -a / -A.
> > 
> > In particular the following stats from the standard:
> >  - 30.3.4.2 aPAUSEMACCtrlFramesTransmitted
> >  - 30.3.4.3 aPAUSEMACCtrlFramesReceived
> > 
> > 4 real drivers are converted, hopefully the semantics match
> > the standard.
> > 
> > v2:
> >  - netdevsim: add missing static
> >  - bnxt: fix sparse warning
> >  - mlx5: address Saeed's comments
> 
> DSA used to override the "ethtool -S" callback of the host port, and
> append its own CPU port counters to that.
> 
> So you could actually see pause frames transmitted by the host port and
> received by the switch's CPU port:
> 
> # ethtool -S eno2 | grep pause
> MAC rx valid pause frames: 1339603152
> MAC tx valid pause frames: 0
> p04_rx_pause: 0
> p04_tx_pause: 1339603152
> 
> With this new command what's the plan?

Sounds like something for DSA folks to decide :)

What does ethtool -A $cpu_port control? 
The stats should match what the interface controls.