>> Indeed neither the device nor the lower drivers check protocol checksums.
>> But the CRCs of the encapsulating 1394 packets are checked in hardware.
>> Shall protocol checksums be verified regardless?
>
> Yes, because packets may come from off-link source.
>

Hm, I can't see any off-link packets coming from 
fwnet_finish_incoming_packet()

So I wont verify checksums in the driver.

Stephan