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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next RFC 0/5] Add NTF_EXT_AGED to control FDB
 ageing in SW or HW
Date: Wed, 25 Feb 2015 12:29:33 -0500 (EST)
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From: Andrew Lunn <andrew@lunn.ch>
Date: Wed, 25 Feb 2015 15:31:13 +0100

> I don't think this is going to work. There is no efficient way to get
> the hardware tables out of the hardware. We don't get notification of
> additions or removals. We can only read the whole table. And it can be
> expensive to read the whole table, since it can be 1K or more entries,
> going over an MDIO bus, which in the worst case can be bit banging on
> gpio lines.

Agreed, for most chips, this is how things seem to be structured.