Hi Ben, Yes, this is GRE-specific, somehow gre_sys doesn't support current MTU which is 65000.
`make check-kmod` no. 11 and 21 fail due to this issue. On the kernel side, the error shows up as: [ 6135.119999] gre_sys: Invalid MTU 65000 requested, hw max 1500 It reflects to userspace as error below: dpif_netlink_rtnl|WARN|setting MTU of tunnel gre_sys failed (Invalid argument) Thanks, Yifeng On Fri, Jul 6, 2018 at 10:58 AM, Ben Pfaff <[email protected]> wrote: > On Thu, Jul 05, 2018 at 11:55:46AM -0700, Yifeng Sun wrote: > > When MAX_MTU is larger than hw supported max MTU, > > dpif_netlink_rtnl_create will fail. This leads to > > testing failure '11: datapath - ping over gre tunnel' > > in 'make check-kmod'. > > > > This patch fixes this issue by retrying a smaller MTU > > when MAX_MTU is too large. > > > > Signed-off-by: Yifeng Sun <[email protected]> > > Is this GRE-specific? (Why would only GRE care about large MTUs?) > _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
