netdev - Re: mv88e6321, dual cpu port

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Message-ID: <20230216125040.76ynskyrpvjz34op@skbuf>
Date:   Thu, 16 Feb 2023 14:50:40 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Angelo Dureghello <angelo@...nel-space.org>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org
Subject: Re: mv88e6321, dual cpu port

On Thu, Feb 16, 2023 at 12:20:24PM +0100, Angelo Dureghello wrote:
> Still data passes all trough port6, even when i ping from
> host PC to port4. I was expecting instead to see port5
> statistics increasing.

> # configure the bridge
> ip addr add 192.0.2.1/25 dev br0
> ip addr add 192.0.2.129/25 dev br1

In this configuration you're supposed to put an IP address on the fec2
interface (eth1), not on br1.

br1 will handle offloaded forwarding between port5 and the external
ports (port3, port4). It doesn't need an IP address. In fact, if you
give it an IP address, you will make the sent packets go through the br1
interface, which does dev_queue_xmit() to the bridge ports (port3, port4,
port5), ports which are DSA, so they do dev_queue_xmit() through their
DSA master - eth0. So the system behaves as instructed.