On Mon, Jan 15, 2018 at 11:32:32AM -0500, Eric Garver wrote:
> On Mon, Jan 15, 2018 at 03:17:28PM +0000, James Page wrote:
> > Hi Eric
> >
> > On Mon, 15 Jan 2018 at 16:54 Eric Garver <e...@erig.me> wrote:
> >
> > > On Sat, Jan 13, 2018 at 03:57:08PM +0000, James Page wrote:
> > > > Hi Ben s
> > > >
> > > > On Sat, 13 Jan 2018 at 14:55 James Page <james.p...@ubuntu.com> wrote:
> > > >
> > > > > OK, I sent a patch:
> > > > >> https://patchwork.ozlabs.org/patch/860192/
> > > > >
> > > > >
> > > > > Thanks Ben - I'll pull this patch into the Ubuntu packages and test
> > > this
> > > > > weekend.
> > > > >
> > > >
> > > > I pulled your patch in ontop of our current 2.8.1 packages and
> > > re-tested;
> > > > I'm not seeing a difference in behaviour with the patch in place. I
> > > removed
> > > > the vport_gre and ip_gre kernel modules to force a re-creation of the
> > > > device on restart of OVS as well as trying a reboot of the test machine:
> > > >
> > > > 7: gre0@NONE: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group
> > > > default qlen 1
> > > > link/gre 0.0.0.0 brd 0.0.0.0
> > > > 8: gretap0@NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc noop state DOWN
> > > mode
> > > > DEFAULT group default qlen 1000
> > > > link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
> > > > 9: gre_sys@NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1472 qdisc
> > > > pfifo_fast master ovs-system state UNKNOWN mode DEFAULT group default
> > > qlen
> > > > 1000
> > > > link/ether 52:ad:6d:89:bb:54 brd ff:ff:ff:ff:ff:ff
> > >
> > > Are there any errors is dmesg? It's possible setlink won't accept
> > > UINT16_MAX. grep for "Invalid MTU".
> > >
> >
> > Not under 4.4 but I do under 4.13:
> >
> > [ 6.794079] gre: GRE over IPv4 demultiplexor driver
> > [ 6.797621] ip_gre: GRE over IPv4 tunneling driver
> > [ 6.798326] gre_sys: Invalid MTU 65535 requested, hw max 1500
> >
> > Looks like the kernel is limiting to 1500.
>
> I would expect setting with ip-link to fail as well.
> What does the below show?:
>
> $ ip link set dev gre_sys mtu 65535
Ugh. This is a separate kernel bug fixed by this commit:
commit cfddd4c33c254954927942599d299b3865743146
Author: Xin Long <lucien....@gmail.com>
Date: Mon Dec 18 14:24:35 2017 +0800
ip_gre: remove the incorrect mtu limit for ipgre tap
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