netdev - Re: [PATCH net-next v2 1/9] selftests: hsr: Add ping test for PRP

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Message-ID: <aYHJ9KHdiBEGfjwA@thinkpad>
Date: Tue, 3 Feb 2026 11:12:36 +0100
From: Felix Maurer <fmaurer@...hat.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, horms@...nel.org,
	jkarrenpalo@...il.com, tglx@...utronix.de, mingo@...nel.org,
	allison.henderson@...cle.com, petrm@...dia.com, antonio@...nvpn.net
Subject: Re: [PATCH net-next v2 1/9] selftests: hsr: Add ping test for PRP

On Mon, Feb 02, 2026 at 04:55:10PM +0100, Sebastian Andrzej Siewior wrote:
> On 2026-02-02 12:51:12 [+0100], Felix Maurer wrote:
> > > Hm, I am not sure? For PRP, it's an explicit requirement to use the same
> > > MAC addresses for both ports. For HSR, I think the standard is less
> > > clear about the MAC addresses. And at least our code seems to assume
> > > that there could be different MACs on the two interfaces of a node? But
> > > yes, the node merging addresses this.
> >
> > I'm still not 100% certain, but I agree that the standard reads more
> > like the MAC addresses should be the same for the two HSR ports. At the
> > moment, the kernel and the test assumes that they can/should be
> > different. Therefore, I think we should fix this across the board in
> > another patchset if we agree that's the right thing to do.
>
> I would suggest to do so. This could serve as bad example and my PTP
> userland patches expect the same MAC on both ports. So ;)

I'll put it on my list for another patchset :)
But this of course brings up how the MAC addresses should be handled on
the HSR interfaces in general. At the moment, for HSR we copy the MAC of
portA to master. For PRP, the MAC of portA is copied to master and
portB.

If the MACs should be the same for both ports of an HSR interface,
should we set them when creating the HSR interface, similarly to PRP?
And does it make sense to copy from portA (feels somewhat arbitrary to
me) or would it be cleaner to copy from master to portA and portB?

Thanks,
   Felix