On Mon, Nov 20, 2017 at 02:46:53PM +0000, David Laight wrote: > > There does not seem to be a way to mark DMA address invalid in a driver > > so we probably need to add a flag to struct tbnet_frame instead. > > Can you use the length?
Unfortunately no because size is 12-bit field in struct ring_frame and 0 means 4096 bytes.
