On Mon, May 9, 2016 at 3:28 PM, Tom Herbert <t...@herbertland.com> wrote: > In ip6gre_tnl_link_config set t->tun_len and t->hlen correctly for the > configuration. For hard_header_len and mtu calculation include > IPv6 header and encapsulation overhead. > > In ip6gre_tunnel_init_common set t->tun_len and t->hlen correctly for > the configuration. Revert to setting hard_header_len instead of > needed_headroom. > > Tested: > > ./ip link add name tun8 type ip6gretap remote \ > 2401:db00:20:911a:face:0:27:0 local \ > 2401:db00:20:911a:face:0:25:0 ttl 225 > > Gives MTU of 1434. That is equal to 1500 - 40 - 14 - 4 - 8. > > ./ip link add name tun8 type ip6gretap remote \ > 2401:db00:20:911a:face:0:27:0 local \ > 2401:db00:20:911a:face:0:25:0 ttl 225 okey 123 > > Gives MTU of 1430. That is equal to 1500 - 40 - 14 - 4 - 8 - 4. > > Signed-off-by: Tom Herbert <t...@herbertland.com>
So this gives me the correct result now. However we still need patch 3 / 11 from the set you submitted next week in order to be able to even transmit because the flags are otherwise mangled. Tested-by: Alexander Duyck <adu...@mirantis.com>
