linux-kernel - Re: [RFC PATCH net-next 0/6] Mirroring to DSA CPU port

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Message-ID: <20241004111346.ctsq5bqqq7zfpsuw@skbuf>
Date: Fri, 4 Oct 2024 14:13:46 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Petr Machata <petrm@...dia.com>, Ido Schimmel <idosch@...dia.com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	UNGLinuxDriver@...rochip.com, Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 0/6] Mirroring to DSA CPU port

On Fri, Sep 13, 2024 at 06:29:09PM +0300, Vladimir Oltean wrote:
> Greetings,
> 
> Users of the NXP LS1028A SoC (drivers/net/dsa/ocelot L2 switch inside)
> have requested to mirror packets from the ingress of a switch port to
> software. Both port-based and flow-based mirroring is required.
> 
> The simplest way I could come up with was to set up tc mirred actions
> towards a dummy net_device, and make the offloading of that be accepted
> by the driver. Currently, the pattern in drivers is to reject mirred
> towards ports they don't know about, but I'm now permitting that,
> precisely by mirroring "to the CPU". I am unsure if there are other,
> perhaps better ways of doing this.

Since there aren't any review comments, I will just resubmit this to
net-next.