netdev - Re: [PATCH net-next v2 5/9] selftests: hsr: Add tests for more link faults with PRP

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Message-ID: <20260129133217.xNoDm9nn@linutronix.de>
Date: Thu, 29 Jan 2026 14:32:17 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Felix Maurer <fmaurer@...hat.com>
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 5/9] selftests: hsr: Add tests for more link
 faults with PRP

On 2026-01-22 15:57:00 [+0100], Felix Maurer wrote:
> Add tests where one link has different rates of packet loss or reorders
> packets. PRP should still be able to recover from these link faults and
> show no packet loss.  However, it is acceptable to receive some level of
> duplicate packets. This matches the current specification (IEC
> 62439-3:2021) of the duplicate discard algorithm that requires it to be
> "designed such that it never rejects a legitimate frame, while occasional
> acceptance of a duplicate can be tolerated." The rate of acceptable
> duplicates in this test is intentionally high (10%) to make the test
> stable, the values I observed in the worst test cases (20% loss) are around
> 5% duplicates.

Do you know why we have the duplicates? It is because of the high
sending rate at which point the blocks are dropped and we can't
recognise the duplicate?

> Signed-off-by: Felix Maurer <fmaurer@...hat.com>

Sebastian