netdev - Re: net: dsa: mv88e6xxx architecture

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Message-ID: <20241220225432.jsgw35gq3ejp57va@skbuf>
Date: Sat, 21 Dec 2024 00:54:32 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Luke Howard Bentata <lukeh@...l.com>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Kieran Tyrrell <kieran@...nda.com>,
	Max Hunter <max@...tershome.org>
Subject: Re: net: dsa: mv88e6xxx architecture

On Sat, Dec 21, 2024 at 08:43:50AM +1100, Luke Howard Bentata wrote:
> Hi Vladimir,
> 
> > I think we need an AVB primer. What identifies an AVB stream? Should the
> > kernel have a database of them? What actions need to be taken for AVB
> > streams different than for best effort traffic? Is it about scheduling
> > priority, or about resource reservations, or? Does the custom behavior
> > pertain only to AVB streams or is it a more widely useful mechanism?
> 
> The catch is what to do with frames that share a priority with an AVB
> class but are not negotiated by SRP. These frames could crowd out
> frames from AVB streams. Marvell’s solution is a flag in the ATU which
> indicates that the DA was added by SRP.

Can you please state in a vendor-agnostic way what does the switch do
with that information, how does it treat those streams specially?