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

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Date:   Wed, 27 Dec 2017 14:15:31 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
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

Wed, Dec 27, 2017 at 02:08:03PM CET, andrew@...n.ch wrote:
>> This is misunderstanding I believe. This is not about ABI. That is well
>> defined by the netlink attributes. This is about meaning of particular
>> ASIC-specific internal resources.
>
>I would agree that the netlink attributed are clearly defined. But the
>meta information, what this ASIC specific internal resource means when
>you combine these attributes, is unclear. This meta information is
>also part of the ABI, and documenting giving users a hit what it
>means, and why they should change it, would be good practice.
>
>Look at sysfs. open/read/write are clearly defined, which is the
>equivalent of the netlink attributes. The meta information we document
>in Documentation/ABI/, what a file name means, what a value means,
>what other values it can take, etc.

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. That makes 0 sense
to me, sorry.