netdev - DSA to switchdev (TI CPSW) ethernet ports

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Message-ID: <PASP264MB5297F50F5E2118BBFEA191CAFC292@PASP264MB5297.FRAP264.PROD.OUTLOOK.COM>
Date: Thu, 28 Nov 2024 14:01:23 +0000
From: Jesse Van Gavere <jesse.vangavere@...oteq.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "woojung.huh@...rochip.com" <woojung.huh@...rochip.com>,
 "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>
CC: "andrew@...n.ch" <andrew@...n.ch>, "olteanv@...il.com" <olteanv@...il.com>
Subject: DSA to switchdev (TI CPSW) ethernet ports

Hello,

I have a question in regards to connecting switchdev ports (TI AM62 CPSW in my case) to a switch configured in the DSA framework.
My setup is two KSZ9896Cs connected, one to each port of the AM62x.
Using something like cpsw_port1/2 as the ethernet for the conduit port fails I presume in of_find_net_device_by_node(ethernet) as both eth seem to be under cpsw3g which is the actual ethernet.

So when changing the ethernet for the conduit port to cpsw3g I can actually get switch working, and I see it registers under eth0 of the ethernet, however when the second switch tries to come up it fails because it tries to register a dsa folder under eth0 again.

I'm kind of at a loss what the correct solution here would be, or if this is currently even supported to connect e.g. a cpsw port to a conduit port, if that would not be the case, what is the suggested work I'd best be doing to actually get this working?

Kind regards,
Jesse Van Gavere