netdev - Re: [PATCH net-next v2 2/3] net: dsa: add Arrow SpeedChips XRS700x driver

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Date:   Sat, 28 Nov 2020 01:39:16 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        George McCollister <george.mccollister@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        "open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/3] net: dsa: add Arrow SpeedChips XRS700x
 driver

On Sat, Nov 28, 2020 at 12:30:48AM +0100, Andrew Lunn wrote:
> > If there is a better alternative I'm all ears but having /proc and
> > ifconfig return zeros for error counts while ip link doesn't will lead
> > to too much confusion IMO. While delayed update of stats is a fact of
> > life for _years_ now (hence it was backed into the ethtool -C API).
> 
> How about dev_seq_start() issues a netdev notifier chain event, asking
> devices which care to update their cached rtnl_link_stats64 counters.
> They can decide if their cache is too old, and do a blocking read for
> new values.
> 
> Once the notifier has completed, dev_seq_start() can then
> rcu_read_lock() and do the actual collection of stats from the drivers
> non-blocking.

That sounds smart. I can try to prototype that and see how well it
works, or do you want to?