Re: [PATCH net-next v6 06/12] net: pse-pd: Add support for budget evaluation strategies

[Oleksij Rempel <o.rempel@pengutronix.de>]

Hi,

On Mon, Mar 24, 2025 at 05:33:18PM +0000, Kyle Swenson wrote:
> Hello Kory,
> 
> On Mon, Mar 24, 2025 at 05:39:07PM +0100, Kory Maincent wrote:
> > Hello Kyle, Oleksij,
> ...
> > 
> > Small question on PSE core behavior for PoE users.
> > 
> > If we want to enable a port but we can't due to over budget.
> > Should we :
> > - Report an error (or not) and save the enable action from userspace. On that
> >   case, if enough budget is available later due to priority change or port
> >   disconnected the PSE core will try automatically to re enable the PoE port.
> >   The port will then be enabled without any action from the user.
> > - Report an error but do nothing. The user will need to rerun the enable
> >   command later to try to enable the port again.
> > 
> > How is it currently managed in PoE poprietary userspace tools?
> 
> So in our implementation, we're using the first option you've presented.
> That is, we save the enable action from the user and if we can't power
> the device due to insufficient budget remaining, we'll indicate that status to the
> user.  If enough power budget becomes available later, we'll power up
> the device automatically.

It seems to be similar to administrative UP state - "ip link set dev lan1 up".
I'm ok with this behavior.

-- 
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 |