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

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Message-ID: <ac08a26b-a5d0-4a36-a387-f802c804086f@altera.com>
Date: Wed, 26 Nov 2025 09:54:44 +0530
From: "G Thomas, Rohan" <rohan.g.thomas@...era.com>
To: Andrew Lunn <andrew@...n.ch>
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

Hi Andrew,

On 11/25/2025 9:56 PM, Andrew Lunn wrote:
> 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

Thanks! Sure, I will send the next version to net instead of net-next.

Best Regards,
Rohan