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Message-ID: <ZwU6QuGSbWF36hhF@pengutronix.de>
Date: Tue, 8 Oct 2024 15:57:22 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Andrew Lunn <andrew@...n.ch>
Cc: Kory Maincent <kory.maincent@...tlin.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Jonathan Corbet <corbet@....net>,
Donald Hunter <donald.hunter@...il.com>,
Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-doc@...r.kernel.org, Kyle Swenson <kyle.swenson@....tech>,
Dent Project <dentproject@...uxfoundation.org>,
kernel@...gutronix.de
Subject: Re: [PATCH net-next 08/12] net: pse-pd: pd692x0: Add support for PSE
PI priority feature
On Thu, Oct 03, 2024 at 01:41:02AM +0200, Andrew Lunn wrote:
> > + msg = pd692x0_msg_template_list[PD692X0_MSG_SET_PORT_PARAM];
> > + msg.sub[2] = id;
> > + /* Controller priority from 1 to 3 */
> > + msg.data[4] = prio + 1;
>
> Does 0 have a meaning? It just seems an odd design if it does not.
0 is not documented. But there are sub-priority which are not directly
configured by user, but affect the system behavior.
Priority#: Critical – 1; high – 2; low – 3
For ports with the same priority, the PoE Controller sets the
sub-priority according to the logic port number. (Lower number gets
higher priority).
Port priority affects:
1. Power-up order: After a reset, the ports are powered up according to
their priority, highest to lowest, highest priority will power up first.
2. Shutdown order: When exceeding the power budget, lowest priority
ports will turn off first.
Should we return sub priorities on the prio get request?
If i see it correctly, even if user do not actively configures priorities,
they are always present. For example port 0 will have always a Prio
higher than Port 10.
Regards,
Oleksij
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