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Date:   Fri, 17 Jan 2020 00:48:07 +0100
From:   Andrew Lunn <>
To:     Florian Fainelli <>
Cc:,,, Heiner Kallweit <>,
        "David S. Miller" <>,
        open list <>
Subject: Re: [PATCH net-next v3] net: phy: Maintain MDIO device and bus

On Wed, Jan 15, 2020 at 08:48:50PM -0800, Florian Fainelli wrote:
> We maintain global statistics for an entire MDIO bus, as well as broken
> down, per MDIO bus address statistics. Given that it is possible for
> MDIO devices such as switches to access MDIO bus addresses for which
> there is not a mdio_device instance created (therefore not a a
> corresponding device directory in sysfs either), we also maintain
> per-address statistics under the statistics folder. The layout looks
> like this:
> /sys/class/mdio_bus/../statistics/
> 	transfers
> 	errrors
> 	writes
> 	reads
> 	transfers_<addr>
> 	errors_<addr>
> 	writes_<addr>
> 	reads_<addr>
> When a mdio_device instance is registered, a statistics/ folder is
> created with the tranfers, errors, writes and reads attributes which
> point to the appropriate MDIO bus statistics structure.
> Statistics are 64-bit unsigned quantities and maintained through the
> u64_stats_sync.h helper functions.
> Signed-off-by: Florian Fainelli <>

Tested-by: Andrew Lunn <>
Reviewed-by: Andrew Lunn <>


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