netdev - Re: [PATCH net-next v2 2/2] net: dsa: yt921x: Add DCB/priority support

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Message-ID: <20260124083701.ihffncswmoe6fw5k@skbuf>
Date: Sat, 24 Jan 2026 10:37:01 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Yangfl <mmyangfl@...il.com>
Cc: Oleksij Rempel <linux@...pel-privat.de>, netdev@...r.kernel.org,
	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 2/2] net: dsa: yt921x: Add DCB/priority
 support

On Sat, Jan 24, 2026 at 10:05:58AM +0800, Yangfl wrote:
> On Sat, Jan 24, 2026 at 7:48 AM Vladimir Oltean <olteanv@...il.com> wrote:
> >
> > Are you sure the "port" selector represents the Ethernet port default
> > priority? It seems odd for it to have any other trust order in hardware
> > than last. What would be the use case for that? Sure it's not an L4 port,
> > which could be mapped over IEEE_8021QAZ_APP_SEL_ANY?
> >
> 
> No (with the "port" selector) but I'm wondering, do we have
> corresponding port prio methods
> port_add_stream_prio()/port_add_dgram_prio() or something like?

No, but it doesn't mean dsa_user_dcbnl_ieee_setapp() can't be extended
with the IEEE_8021QAZ_APP_SEL_ANY selector if necessary. I wouldn't
bother to do that just for testing, though, just hack something up to
determine what it's about.