netdev - Re: [RFC PATCH net-next 3/4] net: ti: icssg-prueth: Add support for ICSSG switch firmware on AM654 PG2.0 EVM

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Message-ID: <0d70cebf-8fd0-cf04-ccc2-6f240b27ecca@ti.com>
Date: Tue, 5 Sep 2023 14:13:15 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Andrew Lunn <andrew@...n.ch>
CC: Simon Horman <horms@...nel.org>, Roger Quadros <rogerq@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Jacob Keller
	<jacob.e.keller@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        Paolo
 Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet
	<edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <srk@...com>,
        <r-gunasekaran@...com>
Subject: Re: [RFC PATCH net-next 3/4] net: ti: icssg-prueth: Add support for
 ICSSG switch firmware on AM654 PG2.0 EVM

On 04/09/23 19:38, Andrew Lunn wrote:
>> Switch mode requires loading of new firmware into ICSSG cores. This
>> means interfaces have to taken down and then reconfigured to switch mode
>> using devlink.
> 
> Can you always run it in switch mode, just not have the ports in a
> bridge?
> 
> 	Andrew

No, we can't always run it in switch mode. Switch mode requires loading
of different firmware. The switch firmware only supports switch
operations. If the ports are not in a bridge in switch mode, the normal
functionalities will not work. We will not be able to send / receive /
forward packets in switch mode without bridge.

When device is booted up, the dual EMAC firmware is loaded and ICSSG
works in dual EMAC mode with both ports doing independent TX / RX.

When switch mode is enabled, dual EMAC firmware is unloaded and switch
firmware is loaded. The ports become part of the bridge and the two port
together acts as a switch.

-- 
Thanks and Regards,
Danish