On Fri, Jan 29, 2016 at 1:09 PM, Sowmini Varadhan <sowmini.varad...@oracle.com> wrote: > On (01/29/16 13:00), Tom Herbert wrote: >> Doesn't every IP/VXLAN packet contains unaligned headers? Why don't >> those create alignment issues (like when stack looks at addresses)? > > They do. > > http://comments.gmane.org/gmane.linux.network/370672 > > some of it was fixed in https://lkml.org/lkml/2015/7/20/63. > There's still some NET_IP_ALIGN missing. IIRC, I was seeing > this for mldv3, but the fix has to be done carefully, by > someone who knows how to fully regression test it. > > I dont know if other tunneling methods manage to get the > NET_IP_ALIGN correct in every case. > > Also, while sparc complains about unaligned access > in most cases, some sins may pass under the radar, and other > platforms dont even generate traps, so it's easy to not know > that there's a problem, a lot of the time. > The sparc documentation is pretty clear http://docs.oracle.com/cd/E19253-01/816-4854/hwovr-2/index.html, seems like unaligned accesses are not allowed in the architecture.
Tom > --Sowmini >
