Hi Yi,
Thanks for the confirmation and for rebasing the existing L3 tunneling
patches to include VXLAN-GPE.
Unfortunately, Simon's original user-space implementation in patches
9/17 through 11/17 using base_layer and offset fields in dp_packet is
not compatible to our ongoing implementation of versatile tunnel ports
in PTAP and non-PTAP bridges, which is based on an explicit packet_type
field.
To avoid extensive rework, I would rather not merge these changes into
master now but substitute them with the final implementation. This is
work-package "3 - L3 ports in non-PTAP pipeline" in our Google doc and
Zoltan and I will have that ready soon.
Regarding the implementation of NSH support, we should work together to
implement what is described in the Google doc:
https://docs.google.com/document/d/1oWMYUH8sjZJzWa72o2q9kU0N6pNE-rwZcLH3-kbbDR8/edit#heading=h.wp4o2op1lp9z
In our opinion the earlier NSH patches cannot be upstreamed because of a
couple of fundamental conceptual problems:
* The NXM fields for NSH are used both as packet match fields and as
packet metadata fields (after decap).
This ambiguity leads to problems, latest when dealing with NSH in
NSH packets.
* They introduce push/pop_nsh OpenFlow actions without dealing with
the resulting non-Ethernet packets in the pipeline. The behavior is
not at all well defined.
* The re-use of the Geneve tunnel metada fields for NSH MD2 TLVs is
problematic because
a) it again mixes packet metadata and header fields and
b) it couldn't handle NSH MD2 in Geneve tunnels.
All these issues are addressed in the proposed new solution built on
PTAP and EXT-382. The fundamentals are aligned with ONF (OXM classes
already assigned), so that there is a good chance that we can feed the
OVS implementation of NSH into the next OpenFlow standard. The first
phase covering the fixed MD1 NSH header should also be possible to
upstream in Q1/17, quite soon after the basic patches for PTAP and EXT-382.
Let's have a direct talk when I'm back in office after New Year.
Regards, Jan
On 2016-12-23 01:51, Yang, Yi Y wrote:
Hi, Jan
I confirm I can take VxLAN-gpe and NSH related work, now I'm pushing Jiri's L3
patches ot ovs in order that it can be ported into ovs as early as possible,
Pravin, Joe and Jarno found some vlan-related issues in Jiri's L3 patches in
net-next and worked out several patches for net-next, but they are not merged
yet.
But I have had a workable local ovs version with Jiri's l3 patches and Jarno's
fix patches merged, I have worked out several patches to make sure VxLAN-gpe
can work in layer3 and layer 2 mode, now they are ready except DPDK userspace
has some issues which I'm debugging.
So I think L3 patches and VxLAN-gpe will be ready very soon.
I remember every guys agreed our old NSH implementation with MD type 2 support,
I think that will be the fastest path we can take for NSH support, I dare to
guarantee it can be ready to merge about one month after (including kernel
patches and ovs patches)
I'm wondering if you guys can make a form to list pros and cons for the old
implementation way and this new one in order that every people can clearly know
what the advantages and disadvantages for them are.
From: Jan Scheurich [mailto:[email protected]]
Sent: Thursday, December 22, 2016 6:51 PM
To: Zoltán Balogh <[email protected]>; Yang, Yi Y <[email protected]>; Jiri Benc ([email protected])
<[email protected]>; Pravin Shelar <[email protected]>; Simon Horman ([email protected])
<[email protected]>; '[email protected]' <[email protected]>; '[email protected]' <[email protected]>; 'Ben Pfaff'
<[email protected]>; '[email protected]' <[email protected]>; [email protected]
Subject: RE: Sync on PTAP, EXT-382 and NSH
Thanks for the good meeting. Here are my notes:
Date: 2016-12-21, 17-18:30 CET
Participants: Jarno R, Ben P, Ben M-C, Jiri B, Simon H, Zoltan B, Jan S
Summary:
· Discussed making PTAP, EXT-382 and NSH available as extensions to OF
1.3.
· No big deal for the match fields and the encap/decap actions
· Potential problem could be the missing packet_type information in OF
1.3 Packet In, Packet Out and Table Features (Note: Closer inspection of OF
1.5.1 spec reveals that OXM packet_type is part of struct ofp_match in Packet
In and Packet Out. It should be OK for an OF 1.3 controller extended with PTAP
support)
· Is it simpler for the controllers to upgrade to OF 1.5?
· Deferred the decision
· Agreed to use the (to be assigned) OXM field code points for
packet_type and NSH in OVS for all OF versions
· Agreed to allow all NS=1 packet types received from/sent to a tunnel
port that uses the Ethertype name space in its protocol field (like GRE). Other
versatile tunnel ports (like VXLAN-GPE) which have their own code points
require explicit mapping and must drop packets for which no such mapping exists.
· Discussed introduction of a new OXM class for the proposed GEN_TLV
fields
· No problem to reserve an OXM class even before those fields are
standardized
· For standardization we also need to specify a dynamic binding
mechanism between protocol TLVs and GEN_TLV fields. We can submit the mechanism
to be developed in OVS for standardization when its stable.
· Walk-through of division into work packages:
· Some follow up needed for the L3 packet support kernel datapath patches
· Rest OK
· Technical discussion around GEN_TLV and use for NSH MD2 in conjunction
with encap(NSH) to be continued in the Google doc.
· Time line:
· The entire work should be targeting OVS 2.8 with feature freeze around
July
· OVS 2.7 is having feature freeze already in early January
· Work packages can be upstreamed individually. NSH MD1 support doesn't
have to wait for MD2
· Basically agreed to the work split proposed in the document:
· RedHat is taking the patches for L3 tunnel configuration (including
use of RTNETLINK for config)
· Ericsson take the infrastructure components (L3-tunnels, PTAP, Basic
EXT-382)
· Jarno (VMware) will handle the GEN_TLV infrastructure
· Confirm with Yi Yang (Intel): Can they take VXLAN-GPE and the
NSH-specific WPs? Or do they need help?
· Way of working
· Continue the meeting series for coordination of effort
· Can use a feature integration branch to ease the joint development and
test
· Review of patches mainly through the ovs-dev mailing list
· Use tools like git citool to break up larger patches into a series of
smaller patches for review
-----Original Appointment-----
From: Jan Scheurich
Sent: Sunday, 18 December, 2016 15:34
To: Jan Scheurich; Zoltán Balogh; Yang, Yi Y ([email protected]<mailto:[email protected]>); Jiri Benc
([email protected]<mailto:[email protected]>); Pravin Shelar; Simon Horman
([email protected]<mailto:[email protected]>);
[email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; Ben Pfaff;
'[email protected]'; [email protected]<mailto:[email protected]>
Subject: Sync on PTAP, EXT-382 and NSH
When: Wednesday, 21 December, 2016 17:00-18:30 (UTC+01:00) Amsterdam, Berlin,
Bern, Rome, Stockholm, Vienna.
Where: Skype Meeting
Moved to Wednesday same time to accommodate Jiri.
Hope this is still OK for the others.
Hello all,
I would like to call for a final sync meeting before the Christmas break.
Now that we have gone through the main aspects of the design, I would like to
focus on how to divide the entire function into manageable pieces, discuss the
potential work split, an integration anatomy and a rough time plane for
upstreaming. I will try to prepare input in our Google doc for this.
https://docs.google.com/document/d/1oWMYUH8sjZJzWa72o2q9kU0N6pNE-rwZcLH3-kbbDR8/edit
If there are questions left regarding the design, please bring them up as well.
You can also comment on the document at any time.
Regards, Jan
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