[PATCH net v2] net: stmmac: Fix E2E delay mechanism

[Paolo Abeni]

On 11/29/25 4:07 AM, Rohan G Thomas wrote:
> For E2E delay mechanism, "received DELAY_REQ without timestamp" error
> messages show 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 bits in the MAC_Timestamp_Control
> register must be set to 2'b01, 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")
> Signed-off-by: Rohan G Thomas <rohan.g.thomas at altera.com>
> ---
> v1 -> v2:
>    - Rebased patch to net tree
>    - Replace core_type with has_xgmac
>    - Nit changes in the commit message
>    - Link: https://lore.kernel.org/all/20251125-ext-ptp-fix-v1-1-83f9f069cb36@altera.com/

Given there is some uncertain WRT the exact oldest version to be used,
it would be great to have some 3rd party testing/feedback on this. Let's
wait a little more.

Thanks,

Paolo