netdev - Re: [patch net-next v2 00/10] Add support for resource abstraction

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Date:   Wed, 27 Dec 2017 20:31:10 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     David Ahern <dsa@...ulusnetworks.com>, netdev@...r.kernel.org,
        davem@...emloft.net, arkadis@...lanox.com, mlxsw@...lanox.com,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com, ast@...nel.org,
        daniel@...earbox.net, simon.horman@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, john.hurley@...ronome.com,
        alexander.h.duyck@...el.com, linville@...driver.com,
        gospo@...adcom.com, steven.lin1@...adcom.com, yuvalm@...lanox.com,
        ogerlitz@...lanox.com, roopa@...ulusnetworks.com
Subject: Re: [patch net-next v2 00/10] Add support for resource abstraction

> Hmm. That documents mainly sysfs. No mention of Netlink at all. But
> maybe I missed it. Also, that defines the interface as is. However we
> are talking about the data exchanged over the interface, not the
> interface itself. I don't see how ASIC/HW specific thing, like for
> example KVD in our case could be part of kernel ABI.

You need to be very careful here. As soon as somebody starts using it,
it might become an ABI. Or you need to clearly document it is not ABI,
there is no guarantee it will not disappear or change its meaning in
the next kernel, and it should be used with extreme caution.

Personally, if DSA drivers were to expose such settings, i would
consider them ABI, which people can rely on to remain stable.

	Andrew