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

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Date:   Sat, 30 Dec 2017 11:25:50 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Arkadi Sharshevsky <arkadis@...lanox.com>,
        David Ahern <dsa@...ulusnetworks.com>,
        Yuval Mintz <yuvalm@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        mlxsw <mlxsw@...lanox.com>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        "ganeshgr@...lsio.com" <ganeshgr@...lsio.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "simon.horman@...ronome.com" <simon.horman@...ronome.com>,
        "pieter.jansenvanvuuren@...ronome.com" 
        <pieter.jansenvanvuuren@...ronome.com>,
        "john.hurley@...ronome.com" <john.hurley@...ronome.com>,
        "alexander.h.duyck@...el.com" <alexander.h.duyck@...el.com>,
        "linville@...driver.com" <linville@...driver.com>,
        "gospo@...adcom.com" <gospo@...adcom.com>,
        "steven.lin1@...adcom.com" <steven.lin1@...adcom.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        "roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
        Shrijeet Mukherjee <shm@...ulusnetworks.com>
Subject: Re: [patch net-next v2 00/10] Add support for resource abstraction

Sat, Dec 30, 2017 at 11:18:50AM CET, andrew@...n.ch wrote:
>> 1. Both dpipe and devlink resource are abstraction models for
>> hardware entities, and as a result they true to provide generic objects.
>> Each driver/ASIC should register his own and it absolutely proprietary
>> implementation. There is absolutely NO industry standard here, the only
>> thing that resembles a standard is that dpipe looks a bit like P4 only
>> because its proved to be useful for describing packet forwarding
>> pipelines. The host4 table is just a hardware process in the mellanox
>> spectrum ASIC pipeline and it should not be part of ABI, sorry I clearly
>> don't understand how this even came up.
>
>Why should it not be part of the ABI? Are you saying it will change
>from version to version? Are you trying to warning people not to write
>scripts using it, because its meaning will change and what works now
>will break in the next kernel version?

In my opinion it should not change. Unless there is a bug (like the one
DaveA found in mlxsw erif table). Existing tables and resources should
be only added. It is the driver's maintainer responsibility to not to
break user scripts.