Re: [PATCH net-next v5] cadence: Add LSO support.

[David Miller]

From: Rafal Ozieblo <rafalo@xxxxxxxxxxx>
Date: Mon, 14 Nov 2016 09:32:34 +0000

>> If UFO is in use it should not silently disable UDP checksums.
>> 
>> If you cannot support UFO with proper checksumming, then you cannot enable support for that feature.
> 
> According Cadence Gigabit Ethernet MAC documentation:
> 
> "Hardware will not calculate the UDP checksum or modify the UDP checksum field. Therefore software
> must set a value of zero in the checksum field in the UDP header (in the first payload buffer)
> to indicate to the receiver that the UDP datagram does not include a checksum."
> 
> It is hardware requirement.

I do not doubt that it is a hardware restriction.

But I am saying that you cannot enable this feature under Linux if
this is how it operates on your hardware.