netdev - Re: [RFC PATCH net-next v2 6/6] devlink: add overwrite mode to flash update

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Date:   Tue, 28 Jul 2020 09:58:44 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Jakub Kicinski <kubakici@...pl>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Tom Herbert <tom@...bertland.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michael Chan <michael.chan@...adcom.com>,
        Bin Luo <luobin9@...wei.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        Ido Schimmel <idosch@...lanox.com>,
        Danielle Ratson <danieller@...lanox.com>
Subject: Re: [RFC PATCH net-next v2 6/6] devlink: add overwrite mode to flash
 update

On 7/28/2020 4:19 AM, Jiri Pirko wrote:
> Yes. Documentation is very easy to ignore unfortunatelly. The driver
> developer has to be tight up by the core code and api, I believe.
> 

So I'm not sure what the best proposal here is. We do have a list of
generic components, but given that each piece of HW has different
elements, it's not always feasible to have fully generic names. Some of
the names are driver specific.

I guess we could use some system where components are "registered" when
loading the devlink, so that they can be verified by the stack when used
as a parameter for flash update? Perhaps take something like the
table-driven approach used for infos and extend that into devlink core
so that drivers basically register a table of the components which
includes both a function callback that gets the version string as well
as an indication of whether that component can be updated via flash_update?

I know it would also be useful for ice to have a sort of "pre-info"
callback that generates a context structure that is passed to each of
the info callbacks. (that way a single up-front step could be to lookup
the relevant information, and this is then forwarded to each of the
formatter functions for each component).

Am I on the right track here or just over-engineering?