netdev - Re: [RFC net-next 0/5] Add ETS and TBF Qdisc offload for Airoha EN7581 SoC

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Message-ID: <20241211154109.dvkihluzdouhtamr@skbuf>
Date: Wed, 11 Dec 2024 17:41:09 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: netdev@...r.kernel.org, andrew@...n.ch, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	horms@...nel.org, nbd@....name, sean.wang@...iatek.com,
	Mark-MC.Lee@...iatek.com, lorenzo.bianconi83@...il.com
Subject: Re: [RFC net-next 0/5] Add ETS and TBF Qdisc offload for Airoha
 EN7581 SoC

Hi Lorenzo,

On Wed, Dec 11, 2024 at 04:31:48PM +0100, Lorenzo Bianconi wrote:
> Introduce support for ETS and TBF qdisc offload available in the Airoha
> EN7581 ethernet controller.
> Some DSA hw switches do not support Qdisc offloading or the mac chip
> has more fine grained QoS capabilities with respect to the hw switch
> (e.g. Airoha EN7581 mac chip has more hw QoS and buffering capabilities
> with respect to the mt7530 switch). 
> Introduce ndo_setup_tc_conduit callback in order to allow tc to offload
> Qdisc policies for the specified DSA user port configuring the hw switch
> cpu port (mac chip).

Can you please make a detailed diagram explaining how is the conduit
involved in the packet data path for QoS? Offloaded tc on a DSA user
port is supposed to affect autonomously forwarded traffic too (like the
Linux bridge).