netdev - Re: [PATCH net-next] dsa: Make offloading optional on per port basis

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Message-ID: <20241202094508.4tpbed2b4amyvbsi@skbuf>
Date: Mon, 2 Dec 2024 11:45:08 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Andy Strohman <andrew@...rewstrohman.com>,
	Andrew Lunn <andrew+netdev@...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>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] dsa: Make offloading optional on per port basis

On Mon, Dec 02, 2024 at 10:27:25AM +0100, Jiri Pirko wrote:
> Why is this DSA specific? Plus, you say you want to disable offloading
> in general (DSA_FLAG_OFFLOADING_DISABLED), but you check the flag only
> when joining bridge. I mean, shouldn't this be rather something exposed
> by some common UAPI?

I agree with this. The proposed functionality isn't DSA specific, and
thus, the UAPI to configure it shouldn't be made so.

> Btw, isn't NETIF_F_HW_L2FW_DOFFLOAD what you are looking for?

Is it? macvlan uses NETIF_F_HW_L2FW_DOFFLOAD to detect presence of
netdev_ops->ndo_dfwd_add_station(). Having to even consider macvlan
offload and its implications just because somebody decided to monopolize
the "l2-fwd-offload" name seems at least bizarre in my opinion.