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

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Date:   Thu, 10 Sep 2020 14:33:07 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
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 9/10/2020 2:23 PM, Jakub Kicinski wrote:
> 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.
> 

Ah, I see. So basically using either doesn't really impact anything
because everything will just do the direct method and fail otherwise? Ok.

>> 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
> 
Yea. I'm happy to wait a bit for this to settle and then look at it
again in a few weeks.

Thanks,
Jake