netdev - Re: [PATCH v2 net-next] net: hsr: sync hw addr of slave2 according to slave1 hw addr on PRP

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Message-ID: <05c4da9d-6701-48ef-b80b-a28646940be3@redhat.com>
Date: Tue, 1 Apr 2025 11:16:09 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Fernando Fernandez Mancera <ffmancera@...eup.net>, netdev@...r.kernel.org
Cc: lukma@...x.de, wojciech.drewek@...el.com, m-karicheri2@...com
Subject: Re: [PATCH v2 net-next] net: hsr: sync hw addr of slave2 according to
 slave1 hw addr on PRP

On 3/28/25 5:06 PM, Fernando Fernandez Mancera wrote:
> In order to work properly PRP requires slave1 and slave2 to share the
> same MAC address. To ease the configuration process on userspace tools,
> sync the slave2 MAC address with slave1.
> 
> Signed-off-by: Fernando Fernandez Mancera <ffmancera@...eup.net>
> ---
> NOTE: I am not sure the call_netdevice_notifiers() are needed here.
> I am wondering, if this change makes sense in HSR too.
> Feedback is welcome.
> v2: specified the target tree

Please respect the 24h grace period before reposting:

https://elixir.bootlin.com/linux/v6.14-rc6/source/Documentation/process/maintainer-netdev.rst#L15

Also please note that net-next is currently closed for new features due
to the merge window. Please resent after Apr 7th.

> ---
>  net/hsr/hsr_device.c | 2 ++
>  net/hsr/hsr_main.c   | 9 +++++++++
>  2 files changed, 11 insertions(+)
> 
> diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
> index 439cfb7ad5d1..f971eb321655 100644
> --- a/net/hsr/hsr_device.c
> +++ b/net/hsr/hsr_device.c
> @@ -706,6 +706,8 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
>  		 */
>  		hsr->net_id = PRP_LAN_ID << 1;
>  		hsr->proto_ops = &prp_ops;
> +		eth_hw_addr_set(slave[1], slave[0]->dev_addr);

I'm unsure about this. It will have 'destructive' effect on slave[1],
i.e. the original mac address will be permanently chaneged and will be
up to the user-space restore it when/if removing from hsr.

I think it would be better to additionally store the original mac
address at hsr creation time and restore it at link removal time.

Thanks,

Paolo