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OPENFLOW-1.1+
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OpenFlow 1.1+ support in Open vSwitch
=====================================
Open vSwitch support for OpenFlow 1.1, 1.2, and 1.3 is a work in
progress. This file describes the work still to be done.
The Plan
--------
OpenFlow version support is not a build-time option. A single build
of Open vSwitch must be able to handle all supported versions of
OpenFlow. Ideally, even at runtime it should be able to support all
protocol versions at the same time on different OpenFlow bridges (and
perhaps even on the same bridge).
At the same time, it would be a shame to litter the core of the OVS
code with lots of ugly code concerned with the details of various
OpenFlow protocol versions.
The primary approach to compatibility is to abstract most of the
details of the differences from the core code, by adding a protocol
layer that translates between OF1.x and a slightly higher-level
abstract representation. The core of this approach is the many struct
ofputil_* structures in lib/ofp-util.h.
As a consequence of this approach, OVS cannot use OpenFlow protocol
definitions that closely resemble those in the OpenFlow specification,
because openflow.h in different versions of the OpenFlow specification
defines the same identifier with different values. Instead,
openflow-common.h contains definitions that are common to all the
specifications and separate protocol version-specific headers contain
protocol-specific definitions renamed so as not to conflict,
e.g. OFPAT10_ENQUEUE and OFPAT11_ENQUEUE for the OpenFlow 1.0 and 1.1
values for OFPAT_ENQUEUE. Generally, in cases of conflict, the
protocol layer will define a more abstract OFPUTIL_* or struct
ofputil_*.
Here are the current approaches in a few tricky areas:
* Port numbering. OpenFlow 1.0 has 16-bit port numbers and later
OpenFlow versions have 32-bit port numbers. For now, OVS
support for later protocol versions requires all port numbers to
fall into the 16-bit range, translating the reserved OFPP_* port
numbers.
* Actions. OpenFlow 1.0 and later versions have very different
ideas of actions. OVS reconciles by translating all the
versions' actions (and instructions) to and from a common
internal representation.
OpenFlow 1.1
------------
The list of remaining work items for OpenFlow 1.1 is below. It is
probably incomplete.
* The new in_phy_port field in OFPT_PACKET_IN needs some kind of
implementation. It has a sensible interpretation for tunnels
but in general the physical port is not in the datapath for OVS
so the value is not necessarily meaningful. We might have to
just fix it as the same as in_port.
[required for OF1.1; optional for OF1.2+]
* OFPT_TABLE_MOD message. This is new in OF1.1, so we need to
implement it. It should be implemented so that the default OVS
behavior does not change.
[required for OF1.1 and OF1.2]
* MPLS. Simon Horman maintains a patch series that adds this
feature. This is partially merged.
[optional for OF1.1+]
* Match and set double-tagged VLANs (QinQ). This requires kernel
work for reasonable performance.
[optional for OF1.1+]
* VLANs tagged with 88a8 Ethertype. This requires kernel work for
reasonable performance.
[required for OF1.1+]
* Groups.
* Type all
[required for OF1.1+]
* Type select
[optional for OF1.1+]
* Type indirect
[required for OF1.1+]
* Type fast failover
[optional for OF1.1+]
* Statistics
[optional for OF1.1+]
OpenFlow 1.2
------------
OpenFlow 1.2 support requires OpenFlow 1.1 as a prerequisite. All the
additional work specific to Openflow 1.2 are complete. (This is based
on the change log at the end of the OF1.2 spec. I didn't compare the
specs carefully yet.)
* Action translation needs some work to transform OpenFlow 1.1
field modification actions into OpenFlow 1.2+ "set-field"
actions, because OpenFlow 1.2 dropped support for the OF1.1
actions.
OpenFlow 1.3
------------
OpenFlow 1.3 support requires OpenFlow 1.2 as a prerequisite, plus the
following additional work. (This is based on the change log at the
end of the OF1.3 spec, reusing most of the section titles directly. I
didn't compare the specs carefully yet.)
* Add support for multipart requests.
Currently we always report OFPBRC_MULTIPART_BUFFER_OVERFLOW.
[optional for OF1.3+]
* Add OFPMP_TABLE_FEATURES statistics.
[optional for OF1.3+]
* More flexible table miss support.
This requires the following.
- Change the default table-miss action (in the absense of table-miss
entry) from packet_in to drop for OF1.3+. Decide what to do if
a switch is configured to support multiple OF versions.
[required for OF1.3+]
* IPv6 extension header handling support. Fully implementing this
requires kernel support. This likely will take some careful and
probably time-consuming design work. The actual coding, once
that is all done, is probably 2 or 3 days work.
[optional for OF1.3+]
* Per-flow meters. Similar to IPv6 extension headers in kernel
and design requirements. Might be politically difficult to add
directly to the kernel module, since its functionality overlaps
with tc. Ideally, therefore, we could implement these somehow
with tc, but I haven't investigated whether that makes sense.
[optional for OF1.3+]
* Per-connection event filtering. OF1.3 adopted Open vSwitch's
existing design for this feature so implementation should be
easy.
[required for OF1.3+]
* Auxiliary connections. An implementation in generic code might
be a week's worth of work. The value of an implementation in
generic code is questionable, though, since much of the benefit
of axuiliary connections is supposed to be to take advantage of
hardware support. (We could make the kernel module somehow
send packets across the auxiliary connections directly, for
some kind of "hardware" support, if we judged it useful enough.)
[optional for OF1.3+]
* MPLS BoS matching. (Included in Simon's MPLS series?)
[optional for OF1.3+]
* Provider Backbone Bridge tagging. I don't plan to implement
this (but we'd accept an implementation).
[optional for OF1.3+]
* Rework tag order. I'm not sure whether we need to do anything
for this. Part of MPLS patchset by Simon Horman.
[required for v1.3+]
* On-demand flow counters. I think this might be a real
optimization in some cases for the software switch.
[optional for OF1.3+]
ONF OpenFlow Exensions for 1.3.X Pack1
--------------------------------------
OpenFlow 1.3 has a bunch of ONF extentions.
Many of them are necessary for OpenFlow 1.4 as well.
* Flow entry notifications
This seems to be modelled after OVS's NXST_FLOW_MONITOR.
[EXT-187]
[required for OF1.4+]
* Role Status
[EXT-191]
[required for OF1.4+]
* Flow entry eviction
OVS has flow eviction functionality.
table_mod OFPTC_EVICTION, flow_mod 'importance', and
table_desc ofp_table_mod_prop_eviction need to be implemented.
[EXT-192-e]
[optional for OF1.4+]
* Vacancy events
[EXT-192-v]
[optional for OF1.4+]
* Bundle
Transactional modification. OpenFlow 1.4 requires to support
flow_mods and port_mods in a bundle.
(Not related to OVS's 'ofbundle' stuff.)
[EXT-230]
[required for OF1.4+]
* Table synchronisation
[EXT-232]
[optional for OF1.4+]
* Group notifications
[EXT-235]
[optional for OF1.4+]
* Bad flow entry priority error
Probably not so useful to the software switch.
[EXT-236]
[optional for OF1.4+]
* Set async config error
[EXT-237]
[optional for OF1.4+]
* PBB UCA header field
[EXT-256]
[optional for OF1.4+]
* Duplicate instruction error
We already have ONFBIC_DUP_INSTRUCTION.
[EXT-260]
[required for OF1.4+]
* Multipart timeout error
[EXT-264]
[required for OF1.4+]
OpenFlow 1.4
------------
* More extensible wire protocol
Many on-wire structures got TLVs.
[EXT-262]
[required for OF1.4+]
* More descriptive reasons for packet-in
Distinguish OFPR_APPLY_ACTION, OFPR_ACTION_SET, OFPR_GROUP,
OFPR_PACKET_OUT. NO_MATCH was renamed to OFPR_TABLE_MISS.
[EXT-136]
[required for OF1.4+]
* Optical port properties
[EXT-154]
[optional for OF1.4+]
* Flow-removed reason for meter delete
Report flow removal due to meter deletion with OFPRR_METER_DELETE.
[EXT-261]
[optional for OF1.4+]
* Meter notifications
[EXT-235]
[optional for OF1.4+]
How to contribute
-----------------
If you plan to contribute code for a feature, please let everyone know
on ovs-dev before you start work. This will help avoid duplicating
work.
Please consider the following:
* Testing. Please test your code.
* Unit tests. Please consider writing some. The tests directory
has many examples that you can use as a starting point.
* ovs-ofctl. If you add a feature that is useful for some
ovs-ofctl command then you should add support for it there.
* Documentation. If you add a user-visible feature, then you
should document it in the appropriate manpage and mention it in
NEWS as well.
* Coding style (see the CodingStyle file at the top of the source
tree).
* The patch submission guidelines (see SubmittingPatches). I
recommend using "git send-email", which automatically follows a
lot of those guidelines.
Bug Reporting
-------------
Please report problems to bugs@openvswitch.org.