Re: NFSv4 boot support?

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hello Dan,

On 19.02.24 03:17, Dan Shelton wrote:
> On Sat, 17 Feb 2024 at 09:51, Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>>
>> Hello Antony,
>>
>> On 05.02.24 10:59, Antony Pavlov wrote:
>>> On Wed, 31 Jan 2024 22:37:50 +0100
>>> Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>>>
>>> Hi All!
>>>
>>>> Hello Dan,
>>>>
>>>> On 31.01.24 22:03, Dan Shelton wrote:
>>>>> Hello!
>>>>>
>>>>> Does barebox support booting from a NFSv4 filesystem, e.g. boot from
>>>>> NFSv4 filesystem into a Linux NFSv4 netroot (diskless machine)?
>>>>
>>>> The barebox network stack only does UDP/IP. There have been attempts to
>>>> bring a TCP stack into barebox, but none have so far succeeded to
>>>> make it mainline. This is a hard requirement before we can consider
>>>> supporting NFSv4. I hope that lwIP could fill this gap in the future,
>>>> but no one is actively continuing this work as far as I am aware[1].
>>>
>>> I have started integration on picotcp into barebox in 2015, see
>>>   https://lore.barebox.org/barebox/1436991230-14251-10-git-send-email-antonynpavlov@gmail.com/T/
>>>
>>> At the moment I have WIP barebox-v2023.11 with integrated picotcp 2.1:
>>>
>>>   https://github.com/frantony/barebox/tree/20231127.picotcp
>>
>> Cool. Looking at Oleksij's repo, it was based on your work. How well does
>> picotcp work for you? What open issues remain with the patch stack? Is the
>> barebox integration actively used in projects?
>>
>> Is https://github.com/tass-belgium/picotcp the official repository? This hasn't
>> seen development activity in 5 years. lwIP on the other hand still sees active
>> development.
>>
>> Regarding the license, inclusion of BSD-licensed code is ok. You can check out
>> the LICENSES/ subdirectory for the licenses covering barebox.
> 
> If TCP support lands in barebox, how fast can NFSv4 support be implemented?

Depends on who's volunteering to do it. :-)
If your question instead is how much effort a NFSv4 port would be, Uwe did the
NFSv3 port and may have an guesstimate for this?

Cheers,
Ahmad

> 
> Dan

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |