linux-kernel - Re: [PATCH net-next] net: stmmac: Fix E2E delay mechanism

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Message-ID: <e721d2d5-73cc-4c32-b99c-55f0fb625563@lunn.ch>
Date: Tue, 25 Nov 2025 17:26:43 +0100
From: Andrew Lunn <andrew@...n.ch>
To: rohan.g.thomas@...era.com
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Richard Cochran <richardcochran@...il.com>,
	Jose Abreu <Jose.Abreu@...opsys.com>,
	Fugang Duan <fugang.duan@....com>,
	Kurt Kanzenbach <kurt@...utronix.de>, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: stmmac: Fix E2E delay mechanism

On Tue, Nov 25, 2025 at 10:50:02PM +0800, Rohan G Thomas via B4 Relay wrote:
> From: Rohan G Thomas <rohan.g.thomas@...era.com>
> 
> For E2E delay mechanism, "received DELAY_REQ without timestamp" error
> messages shows up for dwmac v3.70+ and dwxgmac IPs.
> 
> This issue affects socfpga platforms, Agilex7 (dwmac 3.70) and
> Agilex5 (dwxgmac). According to the databook, to enable timestamping
> for all events, the SNAPTYPSEL bit in the MAC_Timestamp_Control
> register must be set to 2'b00, and the TSEVNTENA bit must be cleared
> to 0'b0.
> 
> Commit 3cb958027cb8 ("net: stmmac: Fix E2E delay mechanism") already
> addresses this problem for all dwmacs above version v4.10. However,
> same holds true for v3.70 and above, as well as for dwxgmac. Updates
> the check accordingly.
> 
> Fixes: 14f347334bf2 ("net: stmmac: Correctly take timestamp for PTPv2")
> Fixes: f2fb6b6275eb ("net: stmmac: enable timestamp snapshot for required PTP packets in dwmac v5.10a")
> Fixes: 3cb958027cb8 ("net: stmmac: Fix E2E delay mechanism")

Given the list of Fixes: do you want this back ported to stable? If
so, you should not submit it for net-next.

	Andrew