Re: [PATCH net-next] net: stmmac: Remove ARP offload code

[Nicolai Buchwitz]

Hi Maxime

On 31.8.2026 09:13, Maxime Chevallier wrote:
> dwmac can do ARP offloading, where the HW replies to incoming ARP
> requests. This requires multiple steps to work well :
>  - Program the local IP address in a dedicated register
>  - Enable ARP offloading
>
> This is halfway implemented in stmmac, as it's only ever used by
> selftests, and these selftests are failing on at least 2 platforms :
> stm32mp1, and jh7110.
>
> There have been some attempts in the past to support this feature, but
> this never made it upstream. Let's just remove the test and that code,
> until someone actually wants that to work. We should likely have a
> proper API for that so that drivers can use it.
>
> Let's also not mention ARP offload in the stmmac documentation.
>
> Leave the defines in place and the capability detection, this doesn't
> hurt and gives some information about how the IP is synthesized.
>
> Signed-off-by: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
> ---

> [...]

Reviewed-by: Nicolai Buchwitz <nb@xxxxxxxxxxx>

Thanks,
Nicolai