netdev - KSZ9477 HSR Offloading

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Message-ID: <05a6e63e-96c1-4d78-91b9-b00deed044b5@kontron.de>
Date: Tue, 28 Jan 2025 17:14:46 +0100
From: Frieder Schrempf <frieder.schrempf@...tron.de>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc: Lukasz Majewski <lukma@...x.de>
Subject: KSZ9477 HSR Offloading

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?

Thanks!
Frieder