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

- From: Russell King (Oracle) \<linux@armlinux.org.uk\>
- Date: 2025-11-25 23:19:23 
- List: netdev
- Page: https://ratatoskr.run/netdev/2025/11/3312853
- Thread: https://ratatoskr.run/netdev/2025/11/3312239/t.md

```text
On Tue, Nov 25, 2025 at 10:50:02PM +0800, Rohan G Thomas via B4 Relay wrote:
> From: Rohan G Thomas <redacted>
> 
> 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

bits

> register must be set to 2'b00, and the TSEVNTENA bit must be cleared
> to 0'b0.

Are you sure 3.70 is the appropriate point. According to the 3.74
databook, SNAPTYPSEL changed between 3.5 and 3.6.

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```