netdev - Re: KSZ9477 HSR Offloading

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Message-ID: <6d0e1f47-874e-42bf-9bc7-34856c1168d1@lunn.ch>
Date: Tue, 28 Jan 2025 18:51:34 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Frieder Schrempf <frieder.schrempf@...tron.de>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Lukasz Majewski <lukma@...x.de>
Subject: Re: KSZ9477 HSR Offloading

On Tue, Jan 28, 2025 at 05:14:46PM +0100, Frieder Schrempf wrote:
> Hi,
> 
> I'm trying out HSR support on KSZ9477 with v6.12. My setup looks like this:
> 
> +-------------+         +-------------+
> |             |         |             |
> |   Node A    |         |   Node D    |
> |             |         |             |
> |             |         |             |
> | LAN1   LAN2 |         | LAN1   LAN2 |
> +--+-------+--+         +--+------+---+
>    |       |               |      |
>    |       +---------------+      |
>    |                              |
>    |       +---------------+      |
>    |       |               |      |
> +--+-------+--+         +--+------+---+
> | LAN1   LAN2 |         | LAN1   LAN2 |
> |             |         |             |
> |             |         |             |
> |   Node B    |         |   Node C    |
> |             |         |             |
> +-------------+         +-------------+
> 
> On each device the LAN1 and LAN2 are added as HSR slaves. Then I try to
> do ping tests between each of the HSR interfaces.
> 
> The result is that I can reach the neighboring nodes just fine, but I
> can't reach the remote node that needs packages to be forwarded through
> the other nodes. For example I can't ping from node A to C.
> 
> I've tried to disable HW offloading in the driver and then everything
> starts working.
> 
> Is this a problem with HW offloading in the KSZ driver, or am I missing
> something essential?

How are IP addresses configured? I assume you have a bridge, LAN1 and
LAN2 are members of the bridge, and the IP address is on the bridge
interface?

	Andrew