netdev - Re: [net-next v4 2/5] devlink: convert flash

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Message-ID: <20200910142324.1932401d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 10 Sep 2020 14:23:24 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        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: [net-next v4 2/5] devlink: convert flash_update to use params
 structure

On Thu, 10 Sep 2020 13:59:07 -0700 Jacob Keller wrote:
> On 9/9/2020 5:55 PM, Jakub Kicinski wrote:
> > On Wed,  9 Sep 2020 15:26:50 -0700 Jacob Keller wrote:  
> >> The devlink core recently gained support for checking whether the driver
> >> supports a flash_update parameter, via `supported_flash_update_params`.
> >> However, parameters are specified as function arguments. Adding a new
> >> parameter still requires modifying the signature of the .flash_update
> >> callback in all drivers.
> >>
> >> Convert the .flash_update function to take a new `struct
> >> devlink_flash_update_params` instead. By using this structure, and the
> >> `supported_flash_update_params` bit field, a new parameter to
> >> flash_update can be added without requiring modification to existing
> >> drivers.
> >>
> >> As before, all parameters except file_name will require driver opt-in.
> >> Because file_name is a necessary field to for the flash_update to make
> >> sense, no "SUPPORTED" bitflag is provided and it is always considered
> >> valid. All future additional parameters will require a new bit in the
> >> supported_flash_update_params bitfield.  
> > 
> > I keep thinking we should also make the core do the
> > request_firmware_direct(). What else is the driver gonna do with the file name..
> > 
> > But I don't want to drag your series out so:
> > 
> > Reviewed-by: Jakub Kicinski <kuba@...nel.org>
> 
> Hmm. What does _direct do? I guess it means it won't fall back to the
> userspace helper if it can't find the firmware? It looks like MLX
> drivers use it, but others seem to just stick to regular request_firmware.

FWIW _direct() is pretty much meaningless today, I think the kernel
support for non-direct is mostly dropped. Systemd doesn't support it
either.

> This seems like an improvement that we can handle in a follow up series
> either way. Thanks for the review!

Agreed. Too many pending patches for this area already :S