On 02.01.2019 00:36, Andrew Lunn wrote: >>> Is there a .ndo_change_mtu callback, which does not assign a new mtu itself? >>> >> So far all drivers have to do it themselves. But IMO this is more a >> workaround >> for the core not doing it. It's something the core should do. >> Now we can remove this from drivers. > > Hi Heiner > > I think somebody first needs to review all the ndo_change_mtu > implementations and check that none do something funny like round to > multiple of 2 or 4 to satisfy DMA restrictions, etc. If there is such > a thing, we cannot easily move this into the core. > > Andrew > . > Good point. I briefly grepped over all drivers and it's not that many drivers not using the standard assignment dev->mtu = new_mtu. Some are doing things like dev->mtu = max(new_mtu, xx) what could be achieved easier with an appropriate max_mtu setting. But that's a different story. And I was under the impression that such things had been checked because the patch had a "Reviewed-by" from Florian (although he wasn't on cc).
Heiner
