linux-kernel - [PATCH stable-5.15.y 0/2] Fix PTP received on wrong port with bridged SJA1105 DSA

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Date: Fri, 31 May 2024 19:50:14 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: stable@...r.kernel.org,
	Sasha Levin <sashal@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>
Subject: [PATCH stable-5.15.y 0/2] Fix PTP received on wrong port with bridged SJA1105 DSA

It has been brought to my attention that what had been fixed 1 year ago
here for kernels 5.18 and later:
https://lore.kernel.org/netdev/20230626155112.3155993-1-vladimir.oltean@nxp.com/

is still broken on linux-5.15.y. Short summary: PTP boundary clock is
broken for ports under a VLAN-aware bridge.

The reason is that the Fixes: tags in those patches were wrong. The
issue originated from earlier, but the changes from 5.18 (blamed there),
aka DSA FDB isolation, masked that.

A straightforward cherry-pick was not possible, due to the conflict with
the aforementioned DSA FDB isolation work from 5.18. So I redid patch
2/2 and marked what I had to adapt.

Tested on the NXP LS1021A-TSN board.

Vladimir Oltean (2):
  net: dsa: sja1105: always enable the INCL_SRCPT option
  net: dsa: tag_sja1105: always prefer source port information from
    INCL_SRCPT

 drivers/net/dsa/sja1105/sja1105_main.c |  9 ++-----
 net/dsa/tag_sja1105.c                  | 34 ++++++++++++++++++++------
 2 files changed, 28 insertions(+), 15 deletions(-)
---

I'm sorry for the people who will want to backport DSA FDB isolation to
linux-5.15.y :(

-- 
2.34.1