On 6/27/2019 7:51 AM, Ben Pfaff wrote:
On Wed, Jun 26, 2019 at 03:21:49PM -0700, Gregory Rose wrote:
On 6/26/2019 11:59 AM, Ben Pfaff wrote:
On Wed, Jun 26, 2019 at 08:22:07AM -0700, William Tu wrote:
The patch adds ip6gretap support. Tunnel type 'ip6gretap' is a layer 2 GRE
tunnel over IPv6, carrying inner ethernet packets and encap with GRE header
with outer IPv6 header. Encapsulation of layer 3 packet over IPv6 GRE, ip6gre,
is not supported yet. I tested it by running:
# make check-kernel TESTSUITEFLAGS='-k ip6gretap'
under kernel 5.2 and for userspace:
# make check TESTSUITEFLAGS='-k ip6gretap'
Signed-off-by: William Tu <u9012...@gmail.com>
Signed-off-by: Eli Britstein <el...@mellanox.com>
Co-authored-by: Eli Britstein <el...@mellanox.com>
Tested-by: Greg Rose <gvrose8...@gmail.com>
Reviewed-by: Greg Rose <gvrose8...@gmail.com>
Thanks for working to generalize OVS tunnel support.
For IPv4 GRE, we use the "gre" tunnel type and then we use
options:packet_type to control whether the tunnel carries L2 or L3
packets. Is there a reason that IPv6 GRE should be different?
Hi Ben,
unfortunately there is a reason that ipv6 gre is different and that is
because it uses the ARPHRD_IP6GRE HW type. That
is not currently supported by openvswitch so the best we can do for ipv6 gre
is support the L2 tap driver which uses
the ARPHRD_ETHER type.
I think that this is really an implementation detail. Ideally, we would
abstract the interface provided to our users (the configuration in the
database, and the OpenFlow interface) from the implementation in the
datapath. This seems doubly true because I don't know a reason why this
detail of the Linux kernel datapath would extend to other datapaths such
as the userspace datapath.
I agree - there is a lot we could do to improve the user interface for
all the gre based tunnels, including
erspan. I'll see if I can find some time to work on this. Adding
ARPHRD_IP6GRE support to the kernel datapath
has not been scoped yet (SFAIK) and given all the subtle dependencies
that developed because our kernel datapath
has only supported ARPHRD_ETHER in the past I want to express caution.
But if L3 ip6gre support in the kernel
datapath is important then we can look at it.
- Greg
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