netdev - Re: DSCP support for KSZ switches

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Message-ID: <Zfmdk6awiq9M5U5R@pengutronix.de>
Date: Tue, 19 Mar 2024 15:13:39 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Vladimir Oltean <olteanv@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Andrew Lunn <andrew@...n.ch>
Cc: Woojung Huh <woojung.huh@...rochip.com>, UNGLinuxDriver@...rochip.com,
	netdev@...r.kernel.org
Subject: Re: DSCP support for KSZ switches

On Tue, Mar 19, 2024 at 01:50:00PM +0100, Oleksij Rempel wrote:
> Hello all,
> 
> I'm currently working on implementing DSCP support for the KSZ switch series.
> My efforts have led to the successful implementation of several callbacks,
> including:
> 
> port_get_default_prio()
> port_set_default_prio()
> port_get_dscp_prio()
> 
> However, I am facing challenges with port_add_dscp_prio() and
> port_del_dscp_prio() due to the KSZ switches' limitations on per-port DSCP
> configuration. Specifically, the KSZ hardware allows only enabling or disabling
> DSCP as the source of internal priority on a per-port basis. Additionally, it
> supports either global DSCP remapping or using a default mapping, where the
> internal priority is derived from bits 5:3 of the DSCP field.
> 
> Given these constraints, my question revolves around the appropriate tools or
> interfaces for managing DSCP settings on these devices. Should the
> enabling/disabling of DSCP per port be managed through dcb or ethtool?
> Furthermore, concerning the global DSCP mapping, would devlink be the suitable
> choice for this task?

Hm, I assume, the asnwer to my first question is dcb apptrust. I'll need
to extend DSA framework to use it.

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