On Sun, Aug 9, 2020 at 7:12 PM Xie He <xie.he.0...@gmail.com> wrote: > > On Sun, Aug 9, 2020 at 1:48 AM Willem de Bruijn > <willemdebruijn.ker...@gmail.com> wrote: > > > > Does this solve an actual observed bug? > > > > In many ways lapbeth is similar to tunnel devices. This is not common. > > Thank you for your comment! > > This doesn't solve a bug observed by me. But I think this should be > necessary considering the logic of the code. > > Using "grep", I found that there were indeed Ethernet drivers that set > needed_tailroom. I found it was set in these files: > drivers/net/ethernet/sun/sunvnet.c > drivers/net/ethernet/sun/ldmvsw.c > Setting needed_tailroom may be necessary for this driver to run those > Ethernet devices.
What happens when a tunnel device passes a packet to these devices? That will also not have allocated the extra tailroom. Does that cause a bug?
