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

[G Thomas, Rohan]

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 at altera.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