netdev - Re: KSZ9477 HSR Offloading

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Message-ID: <1c140c92-3be6-4917-b600-fa5d1ef96404@kontron.de>
Date: Wed, 29 Jan 2025 08:24:34 +0100
From: Frieder Schrempf <frieder.schrempf@...tron.de>
To: Andrew Lunn <andrew@...n.ch>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 Lukasz Majewski <lukma@...x.de>
Subject: Re: KSZ9477 HSR Offloading

Hi Andrew,

On 28.01.25 6:51 PM, Andrew Lunn wrote:
> 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?

I have a HSR interface on each node that covers LAN1 and LAN2 as slaves
and the IP addresses are on those HSR interfaces. For node A:

ip link add name hsr type hsr slave1 lan1 slave2 lan2 supervision 45
version 1
ip addr add 172.20.1.1/24 dev hsr

The other nodes have the addresses 172.20.1.2/24, 172.20.1.3/24 and
172.20.1.4/24 respectively.

Then on node A, I'm doing:

ping 172.20.1.2 # neighboring node B works
ping 172.20.1.4 # neighboring node D works
ping 172.20.1.3 # remote node C works only if I disable offloading

Thanks
Frieder