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NEWS
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Post-v3.5.0
--------------------
- Bonding:
* Bond rebalancing log messages of INFO log level are highly reduced: they
are now printed once in rebalance run. Previous detailed log messages
have been moved to the DBG log level.
- DPDK:
* New debug appctl command 'dpdk/get-memzone-stats'.
- ovs-ctl:
* Added a new option, --oom-score=<score>, to set the daemons' Linux
Out-Of-Memory (OOM) killer score.
- SSL/TLS:
* Support for deprecated TLSv1 and TLSv1.1 protocols on OpenFlow and
database connections is now removed.
- Tunnels:
* Support for previously deprecated LISP and STT tunnel port types
is now removed.
- ovs-tcpdump:
* Update the --mirror-to option, adding support for specifying an
existing port as a mirror interface.
v3.5.0 - 17 Feb 2025
--------------------
- The limit on the number of fields for address prefix tracking in flow
tables increased from 3 to 4. For example, it is now possible to
specify both IPv4 and IPv6 address fields at the same time:
$ ovs-vsctl set Bridge br0 flow_tables:123=@N -- \
--id=@N create Flow_Table \
name=table123 prefixes=nw_dst,nw_src,ipv6_dst,ipv6_src
- Address prefix tracking is now enabled by default for both IPv4 and IPv6
address fields: nw_dst, nw_src, ipv6_dst and ipv6_src.
This allows to significantly reduce amount of datapath flows generated
from mixed IPv4+IPv6 flow tables.
- SSL/TLS:
* TLSv1 and TLSv1.1 protocols are deprecated and disabled by default
on OpenFlow and database connections. Use --ssl-protocols to turn
them back on. Support will be fully removed in the next release.
* OpenSSL 1.1.1 or newer is now required for SSL/TLS support.
* The protocol list in --ssl-protocols or corresponding database column
now supports specifying simple protocol ranges like:
- "TLSv1-TLSv1.2" to enable all protocols between TLSv1 and TLSv1.2.
- "TLSv1.2+" to enable protocol TLSv1.2 and later.
The value must be a list of protocols or exactly one protocol range.
* Added explicit support for TLSv1.3. It can now be enabled via
--ssl-protocols (TLSv1.3 was supported in earlier versions only when
this option was not set). TLS ciphersuites for TLSv1.3 and later can
be configured via --ssl-ciphersuites (--ssl-ciphers only applies to
TLSv1.2 and earlier).
* ovs-pki now generates 3072-bit keys by default.
- Userspace datapath:
* The default zone limit, if set, is now inherited by any zone
that does not have a specific value defined, rather than being
treated as a global value, aligning the behavior with that of
the kernel datapath.
* Extended the support for TSO software fallback to include support for
VXLAN, Geneve, and GRE tunneled packets.
- Linux TC offload:
* Add support for matching tunnel flags if the kernel supports it.
* Add support for the "Don't Fragment" (DF) flag in the encap action,
if the kernel supports it.
- Python:
* Added tool called "ovs-flowviz" capable of parsing OpenFlow
and datapath flow dumps and displaying them in several different
formats.
* Dropped support for Python < 3.7.
- DPDK:
* Add support for DPDK 24.11.1.
* Add hardware offload support for matching ICMPv6 protocol
(experimental).
- Tunnels:
* LISP and STT tunnel port types are deprecated and will be removed in
the next release.
- IPsec:
* New option '--root-ipsec-conf' for ovs-monitor-ipsec with Libreswan
to allow cases where '--ipsec-conf' is not the main ipsec.conf, but
included from it. The value should be the path to the main ipsec.conf.
* New option '--use-default-crypto' for ovs-monitor-ipsec with Libreswan
to make it not configure any crypto options (ike/esp) for connections.
Most useful in combination with '--root-ipsec-conf' where system-wide
crypto-policy is included from the root ipsec.conf.
* New option '--ovs-monitor-ipsec-options' for 'ovs-ctl start-ovs-ipsec'
to pass above new options to ovs-monitor-ipsec.
v3.4.0 - 15 Aug 2024
--------------------
- Option '--mlockall' now only locks memory pages on fault, if possible.
This also makes it compatible with vHost Post-copy Live Migration.
- ovs-appctl:
* Added new option [-f|--format] to choose the output format, e.g. 'json'
or 'text' (by default).
* Added new option [--pretty] to print JSON output in a readable fashion.
* 'dpif/show' and 'list-commands' now support output in JSON format.
* Added 'ofproto/detrace' command that outputs the set of OpenFlow rules
and groups that contributed to the creation of a specific datapath flow.
- ovs-vsctl:
* Added a new filter column in the Mirror table which can be used to
apply filters to mirror ports.
- ovs-tcpdump:
* Added command line parameter --filter to enable filtering the packets
that are captured by tcpdump.
- Userspace datapath:
* Conntrack now supports 'random' flag for selecting ports in a range
while natting and 'persistent' flag for selection of the IP address
from a range.
* IPv6 UDP tunnel encapsulation including Geneve and VXLAN will now
honour the csum option. Configuring the interface with
"options:csum=false" now has the same effect as the udp6zerocsumtx
option has with Linux kernel UDP tunnels.
- The primary development branch has been renamed from 'master' to 'main'.
The OVS tree remains hosted on GitHub.
https://github.com/openvswitch/ovs.git
- DPDK:
* OVS validated with DPDK 23.11.1.
* Link status changes are now handled via interrupt mode if the DPDK
driver supports it. It is possible to revert to polling mode by setting
per interface 'options:dpdk-lsc-interrupt' to 'false'.
- Python:
* Added custom transaction support to the Idl via add_op().
* Added support for different output formats like 'json' to Python's
unixctl classes.
- Tunnels:
* Previously the kernel datapath did not enable UDP checksums by default
in IPv6 tunnels. This behaviour is non-standard, differs from the
Linux kernel, and as also different than the userspace datapath. Now
these tunnels will calculate checksums by default and that behaviour can
be changed with "options:csum=false" just as with the userspace
datapath.
- Local sampling is introduced. It reuses the OpenFlow sample action and
allows samples to be emitted locally (instead of via IPFIX) in a
datapath-specific manner. The Linux kernel datapath is the first to
support this feature by using the new datapath 'psample' action. See
'local-group-id' column in the Flow_Sample_Collector_Set table.
- A new configuration knob 'other-config:explicit-sampled-drops' in the
Open_vSwitch table controls whether an explicit drop action shall be
added at the end of datapath flows whose last action is an
observability-driven sample action.
- OpenFlow:
* A new version of the 'sample' action (NXAST_SAMPLE4) is introduced
that allows use of subfields in 'obs_point_id' and 'obs_domain_id'.
v3.3.0 - 16 Feb 2024
--------------------
- OVSDB:
* Support pre-vote mechanism in RAFT that protects the cluster against
disruptive servers (section 9.6 of the original RAFT paper). Upgrading
from older version is supported but it may trigger more leader elections
during the process, and error logs complaining unrecognized fields may
be observed on old nodes.
* New command line option --config-file that allows a fine control over
remotes and database configuration, including setting options for
connection methods for relays and active-backup replication.
For more details see ovsdb-server(1) and ovsdb(7).
* Make use of cooperative multitasking to improve maintenance of RAFT
cluster during long running processing such as online schema conversion.
- OpenFlow:
* NXT_CT_FLUSH extension is updated to support flushing connections
based on mark and labels. 'ct-flush' command of ovs-ofctl updated
to support these new arguments accordingly.
- ovs-appctl:
* 'ofproto/trace' now reports OpenFlow rules that make up a conjunctive
flow match.
* Output of 'dpctl/show' command no longer shows interface configuration
status, only values of the actual configuration options, a.k.a.
'requested' configuration. The interface configuration status,
a.k.a. 'configured' values, can be found in the 'status' column of
the Interface table, i.e. with 'ovs-vsctl get interface <..> status'.
Reported names adjusted accordingly.
* Added support for removal of default CT zone limit, e.g.
"ovs-appctl dpctl/ct-del-limits default".
* 'dpctl/flush-conntrack' is now capable of flushing connections based
on mark and labels.
* 'mdb/show': support for multicast snooping to show the protocol
responsible for adding/updating the entry.
- ovs-vsctl:
* New commands 'set-zone-limit', 'del-zone-limit' and 'list-zone-limits'
to manage the maximum number of connections in conntrack zones via
a new 'limit' column in the 'CT_Zone' database table and
'ct_zone_default_limit' column in the 'Datapath' table.
- Userspace datapath:
* Added support for Generic Segmentation Offloading for the cases where
TSO is enabled but not supported by an egress interface (except for
tunnel interfaces).
* 'pmd-sleep-max' is updated to also accept pmd-thread-core:sleep-max.
The existing behaviour is maintained and a non key:value pair value
will be applied to all other PMD thread cores.'pmd-sleep-show' is
updated to show the maximum sleep for each PMD thread core.
* The userspace conntrack module no longer requires the user to specify
connection helpers in all flow rules. Instead, the helper specified
during connection commit will be used by default.
- DPDK:
* Add support for DPDK 23.11.
v3.2.0 - 17 Aug 2023
--------------------
- OVSDB:
* Changed format in which ovsdb schema conversion operations are stored in
clustered database files. Such operations are now allowed to contain
the bare schema (without data). This allows to significantly improve
the schema conversion performance.
New ovsdb-server process will be able to read old database format, but
old processes will *fail* to read database created by the new one, if
conversion operation is present. For the cluster service model follow
upgrade instructions in 'Upgrading from version 3.1 and earlier to 3.2
and later' section of ovsdb(7).
* When ovsdb-server is running in relay mode, the probe interval is
now configurable via 'ovsdb-server/set-relay-source-probe-interval'
unixctl command.
- IPFIX template and statistics intervals can now be configured through two
new options in the IPFIX table: 'template_interval' and 'stats_interval'.
- Linux kernel datapath:
* OVS now collects per-interface upcall statistics that can be obtained
via 'ovs-appctl dpctl/show -s' or the interface's statistics column
in OVSDB. Available with upstream kernel 6.2+.
- OVS route table in userspace now takes into account preferred source
address from cached kernel routes.
- ovs-appctl:
* Add support for selecting the source address with the
'ovs-appctl ovs/route/add' command.
* New commands "dpctl/{ct-get-sweep-interval,ct-set-sweep-interval}" that
allow to get and set, for the userspace datapath, the sweep interval
for the conntrack garbage collector.
* New commands "dpctl/dump-conntrack-exp" that allows to dump
conntrack's expectations for the userspace datapath.
- ovs-ctl:
* Added new options --[ovsdb-server|ovs-vswitchd]-umask=MODE to set umask
value when starting OVS daemons. E.g., use --ovsdb-server-umask=0002
in order to create OVSDB sockets with access mode of 0770.
- QoS:
* Added new configuration option 'jitter' for a linux-netem QoS type.
* 'linux-htb' QoS type now supports rates higher than 34 Gbps.
- Ingress Policing:
* Ingress policing byte rates can now be configured higher than 34 Gbps.
- DPDK:
* ovs-vswitchd will keep the CAP_SYS_RAWIO capability when started
with the --hw-rawio-access command line option. This allows the
process extra privileges when mapping physical interconnect memory.
* New experimental "rx-steering=rss+<protocol>" option to redirect
certain protocols (for now, only LACP) to a dedicated hardware queue
using the rte_flow API.
- SRv6 Tunnel Protocol
* Added support for userspace datapath (only).
- Userspace datapath:
* Connection tracking now supports extraction of SCTP L4 information.
* Implementation of OpenFlow meters is now lockless allowing for better
multi-thread scalability.
* IP and L4 checksum offload support is now enabled by default for
interfaces that support it. See the 'status' column in the 'interface'
table to check the status.
* 'pmd-maxsleep' other_config was renamed to 'pmd-sleep-max'.
'pmd-maxsleep' is deprecated and will be removed in a future release.
* 'ovs-appctl dpif-netdev/pmd-sleep-show' command was added to get the
max sleep configuration of PMD thread cores.
* Removed experimental tag from PMD load based sleeping.
- Linux TC offload:
* Add support for offloading VXLAN tunnels with the GBP extensions.
- Python
* Added async DNS support.
* Dropped support for Python < 3.6.
v3.1.0 - 16 Feb 2023
--------------------
- ovs-vswitchd now detects changes in CPU affinity and adjusts the number
of handler and revalidator threads if necessary.
- AF_XDP:
* Added support for building with libxdp and libbpf >= 0.7.
* Support for AF_XDP is now enabled by default if all dependencies are
available at the build time. Use --disable-afxdp to disable.
Use --enable-afxdp to fail the build if dependencies are not present.
- ovs-appctl:
* "ovs-appctl ofproto/trace" command can now display port names with the
"--names" option.
- OVSDB-IDL:
* Add the support to specify the persistent uuid for row insert in both
C and Python IDLs.
- Windows:
* Conntrack IPv6 fragment support.
- DPDK:
* Add support for DPDK 22.11.1.
- For the QoS max-rate and STP/RSTP path-cost configuration OVS now assumes
10 Gbps link speed by default in case the actual link speed cannot be
determined. Previously it was 10 Mbps. Values can still be overridden
by specifying 'max-rate' or '[r]stp-path-cost' accordingly.
- OpenFlow:
* New OpenFlow extension NXT_CT_FLUSH to flush connections matching
the specified fields.
- ovs-ctl:
* New option '--dump-hugepages' to include hugepages in core dumps. This
can assist with postmortem analysis involving DPDK, but may also produce
significantly larger core dump files.
- ovs-dpctl and 'ovs-appctl dpctl/' commands:
* 'flush-conntrack' is now capable of handling partial 5-tuple,
with additional optional parameter to specify the reply direction.
- ovs-ofctl:
* New command 'flush-conntrack' that accepts zone and 5-tuple (or partial
5-tuple) for both directions.
- Support for travis-ci.org based continuous integration builds has been
dropped.
- Userspace datapath:
* Add '-secs' argument to appctl 'dpif-netdev/pmd-rxq-show' to show
the pmd usage of an Rx queue over a configurable time period.
* Add new experimental PMD load based sleeping feature. PMD threads can
request to sleep up to a user configured 'pmd-maxsleep' value under
low load conditions.
v3.0.0 - 15 Aug 2022
--------------------
- libopenvswitch API change:
* To fix the Undefined Behavior issue causing the compiler to incorrectly
optimize important parts of code, container iteration macros (e.g.,
LIST_FOR_EACH) have been re-implemented in a UB-safe way.
* Backwards compatibility has mostly been preserved, however the
user-provided pointer is now set to NULL after the loop (unless it
exited via "break;")
* Users of libopenvswitch will need to double-check the use of such loop
macros before compiling with a new version.
* Since the change is limited to the definitions within the headers, the
ABI is not affected.
- OVSDB:
* 'relay' service model now supports transaction history, i.e. honors the
'last-txn-id' field in 'monitor_cond_since' requests from clients.
* New unixctl command 'ovsdb-server/tlog-set DB:TABLE on|off".
If turned on, ovsdb-server will log (at level INFO and rate limited)
all operations that are committed to table TABLE in the DB database.
* New Local_Config schema added to support Connections (--remote)
configuration in a clustered databse independently for each server.
E.g. for listening on unique addresses. See the ovsdb.local-config.5
manpage for schema details.
* Returning unused memory to the OS after the database compaction is now
enabled by default. Use 'ovsdb-server/memory-trim-on-compaction off'
unixctl command to disable.
* Most of the work for the automatic database compaction in clustered
mode has been moved to a separate thread to avoid blocking the process.
- OVSDB-IDL:
* New monitor mode flag, OVSDB_IDL_WRITE_CHANGED_ONLY, allowing
applications to relax atomicity requirements when dealing with
columns whose value has been rewritten (but not changed).
- OpenFlow:
* Extended Flow Monitoring support for all supported OpenFlow versions:
OpenFlow versions 1.0-1.2 with Nicira Extensions
OpenFlow versions 1.3 with Open Network Foundation extension
OpenFlow versions 1.4+, as defined in the OpenFlow specification
- Python:
* Added a new flow parsing library ovs.flow capable of parsing
both OpenFlow and datapath flows.
- IPsec:
* Added support for custom per-tunnel options via 'options:ipsec_*' knobs.
See Documentation/tutorials/ipsec.rst for details.
- Windows:
* Conntrack support for TCPv6, UDPv6, ICMPv6, FTPv6.
* IPv6 Geneve tunnel support.
- DPDK:
* OVS validated with DPDK 21.11.1. It is recommended to use this version
until further releases.
* Delay creating or reusing a mempool for vhost ports until the VM
is started. A failure to create a mempool will now be logged only
when the VM is started.
* New configuration knob 'other_config:shared-mempool-config' to set MTU
that shared mempool mbuf size is based on. This allows interfaces with
different MTU sizes to share mempools.
- Userspace datapath:
* Improved multi-thread scalability of the userspace connection tracking.
* 'dpif-netdev/subtable-lookup-prio-get' appctl command renamed to
'dpif-netdev/subtable-lookup-info-get' to better reflect its purpose.
The old variant is kept for backward compatibility.
* Add actions auto-validator function to compare different actions
implementations against default implementation.
* Add command line option to switch between different actions
implementations available at run time.
* Add build time configure command to enable auto-validator as default
actions implementation at build time.
* Add AVX512 implementation of actions.
- Debian packaging updated to be on par with package source in Debian/Ubuntu.
* Provided an openvswitch-switch-dpdk package that integrates with the
dpdk package in the distributions so that end users can opt into a
DPDK-enabled Open vSwitch binary.
* Provided systemd service files.
* Provided openvswitch-source package for reproducible integrated build of
for example OVN.
* Shared library and subsequently libopenvswitch and libopenvswitch-dev
binary packages are no longer built.
- Linux TC offload:
* Add support for offloading meters via tc police.
* Add support for offloading the check_pkt_len action.
- New configuration knob 'other_config:all-members-active' for
balance-slb bonds.
- Previously deprecated Linux kernel module is now fully removed from
the OVS source tree. The version provided with the Linux kernel
should be used instead.
- XenServer: Support for integration with XenServer has been removed due to
lack of maintenance and bitrot.
v2.17.0 - 17 Feb 2022
---------------------
- Userspace datapath:
* Optimized flow lookups for datapath flows with simple match criteria.
See 'Simple Match Lookup' in Documentation/topics/dpdk/bridge.rst.
* New per-interface configuration knob 'other_config:tx-steering'. If set
to 'hash', enables hash-based Tx packet steering mode to utilize all the
Tx queues of the interface regardles of the number of PMD threads.
* Removed experimental tag for PMD Auto Load Balance.
* New configuration knob 'other_config:n-offload-threads' to change the
number of HW offloading threads.
- DPDK:
* EAL argument --socket-mem is no longer configured by default upon
start-up. If dpdk-socket-mem and dpdk-alloc-mem are not specified,
DPDK defaults will be used.
* EAL argument --socket-limit no longer takes on the value of --socket-mem
by default. 'other_config:dpdk-socket-limit' can be set equal to
the 'other_config:dpdk-socket-mem' to preserve the legacy memory
limiting behavior.
* EAL argument --in-memory is applied by default if supported.
* Add hardware offload support for matching IPv4/IPv6 frag types
(experimental).
* Add hardware offload support for GRE flows (experimental).
Available only if DPDK experimental APIs enabled during the build.
* Add support for DPDK 21.11.
* Forbid use of DPDK multiprocess feature.
* Add support for running threads on cores >= RTE_MAX_LCORE.
- Python:
* For SSL support, the use of the pyOpenSSL library has been replaced
with the native 'ssl' module.
- OVSDB:
* Python library for OVSDB clients now also supports faster
resynchronization with a clustered database after a brief disconnection,
i.e. 'monitor_cond_since' monitoring method.
* Major improvement in the performance of the OVSDB server. See the
"OVSDB: Performance and Scale Journey '21" talk of OVS+OVN Conf'21.
- ovs-dpctl and 'ovs-appctl dpctl/':
* New commands 'cache-get-size' and 'cache-set-size' that allows to
get or configure linux kernel datapath cache sizes.
- ovs-ofctl dump-flows no longer prints "igmp". Instead the flag
"ip,nw_proto=2" is used.
- ovs-appctl:
* New command tnl/neigh/aging to read/write the neigh aging time.
- OpenFlow:
* Default selection method for select groups with up to 256 buckets is
now dp_hash. Previously this was limited to 64 buckets. This change
is mainly for the benefit of OVN load balancing configurations.
* Encap & Decap action support for MPLS packet type.
- Ingress policing on Linux now uses 'matchall' classifier instead of
'basic', if available.
- Add User Statically-Defined Tracing (USDT) probe framework support.
v2.16.0 - 16 Aug 2021
---------------------
- Removed support for 1024-bit Diffie-Hellman key exchange, which is now
considered unsafe.
- Ingress Policing:
* Rate limiting configuration now supports setting packet-per-second
limits in addition to the previously configurable byte rate settings.
This is not supported in the userspace datapath yet.
- OVSDB:
* Introduced new database service model - "relay". Targeted to scale out
read-mostly access (ovn-controller) to existing databases.
For more information: ovsdb(7) and Documentation/topics/ovsdb-relay.rst
* New command line options --record/--replay for ovsdb-server and
ovsdb-client to record and replay all the incoming transactions,
monitors, etc. More datails in Documentation/topics/record-replay.rst.
* The Python Idl class now has a cooperative_yield() method that can be
overridden by an application that uses eventlet / gevent / asyncio with
the desired yield method (e.g. {eventlet,gevent,asyncio}.sleep(0)) to
prevent the application from being blocked for a long time while
processing database updates.
- In ovs-vsctl and vtep-ctl, the "find" command now accept new
operators {in} and {not-in}.
- Userspace datapath:
* Auto load balancing of PMDs now partially supports cross-NUMA polling
cases, e.g if all PMD threads are running on the same NUMA node.
* Userspace datapath now supports up to 2^18 meters.
* Added support for systems with non-contiguous NUMA nodes and core ids.
* Added all-zero IP SNAT handling to conntrack. In case of collision,
using ct(src=0.0.0.0), the source port will be replaced with another
non-colliding port in the ephemeral range (1024, 65535).
* Refactor lib/dpif-netdev.c to multiple header files.
* Add avx512 implementation of dpif which can process non recirculated
packets. It supports partial HWOL, EMC, SMC and DPCLS lookups.
* Add commands to get and set the dpif implementations.
* Add a partial HWOL PMD statistic counting hits similar to existing
EMC/SMC/DPCLS stats.
* Enable AVX512 optimized DPCLS to search subtables with larger miniflows.
* Add more specialized DPCLS subtables to cover common rules, enhancing
the lookup performance.
* Enable the AVX512 DPCLS implementation to use VPOPCNT instruction if the
CPU supports it. This enhances performance by using the native vpopcount
instructions, instead of the emulated version of vpopcount.
* Add command line option to switch between MFEX function pointers.
* Add miniflow extract auto-validator function to compare different
miniflow extract implementations against default implementation.
* Add study function to miniflow function table which studies packet
and automatically chooses the best miniflow implementation for that
traffic.
* Add build time configure command to enable auto-validatior as default
miniflow implementation at build time.
* Cache results for CPU ISA checks, reduces overhead on repeated lookups.
* Add AVX512 based optimized miniflow extract function for traffic type
IPv4/UDP, IPv4/TCP, Vlan/IPv4/UDP and Vlan/Ipv4/TCP.
* Added new 'group' option to pmd-rxq-assign. This will assign rxq to pmds
purely based on rxq and pmd load.
* Add new 'pmd-rxq-isolate' option that can be set to 'false' in order
that pmd cores which are pinned with rxqs using 'pmd-rxq-affinity'
are available for assigning other non-pinned rxqs.
- ovs-ctl:
* New option '--no-record-hostname' to disable hostname configuration
in ovsdb on startup.
* New command 'record-hostname-if-not-set' to update hostname in ovsdb.
- DPDK:
* OVS validated with DPDK 20.11.1. It is recommended to use this version
until further releases.
* New debug appctl command 'dpdk/get-malloc-stats'.
* Add hardware offload support for tunnel pop action (experimental).
Available only if DPDK experimental APIs enabled during the build.
* Add hardware offload support for VXLAN flows (experimental).
Available only if DPDK experimental APIs enabled during the build.
* EAL options --socket-mem and --socket-limit to have default values
removed with 2.17 release. Logging added to alert users.
- ovsdb-tool:
* New option '--election-timer' to the 'create-cluster' command to set the
leader election timer during cluster creation.
- OVS now reports the datapath capability 'ct_zero_snat', which reflects
whether the SNAT with all-zero IP address is supported.
See ovs-vswitchd.conf.db(5) for details.
- ovs-appctl:
* Added ability to add and delete static mac entries using:
'ovs-appctl fdb/add <bridge> <port> <vlan> <mac>'
'ovs-appctl fdb/del <bridge> <vlan> <mac>'
- Linux datapath:
* ovs-vswitchd will configure the kernel module using per-cpu dispatch
mode (if available). This changes the way upcalls are delivered to user
space in order to resolve a number of issues with per-vport dispatch.
* New vswitchd unixctl command `dpif-netlink/dispatch-mode` will return
the current dispatch mode for each datapath.
v2.15.0 - 15 Feb 2021
---------------------
- OVSDB:
* Changed format in which ovsdb transactions are stored in database files.
Now each transaction contains diff of data instead of the whole new
value of a column.
New ovsdb-server process will be able to read old database format, but
old processes will *fail* to read database created by the new one.
For cluster and active-backup service models follow upgrade instructions
in 'Upgrading from version 2.14 and earlier to 2.15 and later' section
of ovsdb(7).
* New unixctl command 'ovsdb-server/get-db-storage-status' to show the
status of the storage that's backing a database.
* New unixctl command 'ovsdb-server/memory-trim-on-compaction on|off'.
If turned on, ovsdb-server will try to reclaim all the unused memory
after every DB compaction back to OS. Disabled by default.
* Maximum backlog on RAFT connections limited to 500 messages or 4GB.
Once threshold reached, connection is dropped (and re-established).
Use the 'cluster/set-backlog-threshold' command to change limits.
- DPDK:
* Removed support for vhost-user dequeue zero-copy.
* Add support for DPDK 20.11.
- Userspace datapath:
* Add the 'pmd' option to "ovs-appctl dpctl/dump-flows", which
restricts a flow dump to a single PMD thread if set.
* New 'options:dpdk-vf-mac' field for DPDK interface of VF ports,
that allows configuring the MAC address of a VF representor.
* Add generic IP protocol support to conntrack. With this change, all
none UDP, TCP, and ICMP traffic will be treated as general L3
traffic, i.e. using 3 tupples.
* Add parameters 'pmd-auto-lb-load-threshold' and
'pmd-auto-lb-improvement-threshold' to configure PMD auto load balance
behaviour.
- The environment variable OVS_UNBOUND_CONF, if set, is now used
as the DNS resolver's (unbound) configuration file.
- Linux datapath:
* Support for kernel versions up to 5.8.x.
- Terminology:
* The terms "master" and "slave" have been replaced by "primary" and
"secondary", respectively, for OpenFlow connection roles.
* The term "slave" has been replaced by "member", for bonds, LACP, and
OpenFlow bundle actions.
- Support for GitHub Actions based continuous integration builds has been
added.
- Bareudp Tunnel
* Bareudp device support is present in linux kernel from version 5.7
* Kernel bareudp device is not backported to ovs tree.
* Userspace datapath support is not added
- ovs-dpctl and 'ovs-appctl dpctl/':
* New commands '{add,mod,del}-flows' where added, which allow adding,
deleting, or modifying flows based on information read from a file.
- IPsec:
* Add option '--no-cleanup' to allow ovs-monitor-ipsec to stop without
tearing down IPsec tunnels.
* Add option '--no-restart-ike-daemon' to allow ovs-monitor-ipsec to start
without restarting ipsec daemon.
- Building the Linux kernel module from the OVS source tree is deprecated
* Support for the Linux kernel is capped at version 5.8
* Only bug fixes for the Linux OOT kernel module will be accepted.
* The Linux kernel module will be fully removed from the OVS source tree
in OVS branch 2.18
v2.14.0 - 17 Aug 2020
---------------------
- ovs-vswitchd no longer deletes datapath flows on exit by default.
- OpenFlow:
* The OpenFlow ofp_desc/serial_num may now be configured by setting the
value of other-config:dp-sn in the Bridge table.
* Added support to watch CONTROLLER port status in fast failover group.
* New action "delete_field".
- DPDK:
* Deprecated DPDK pdump packet capture support removed.
* Deprecated DPDK ring ports (dpdkr) are no longer supported.
* Add hardware offload support for VLAN Push/Pop actions (experimental).
* Add hardware offload support for matching IPv6 protocol (experimental).
* Add hardware offload support for set of IPv6 src/dst/ttl
and tunnel push-output actions (experimental).
* OVS validated with DPDK 19.11.2, due to the inclusion of fixes for
CVE-2020-10722, CVE-2020-10723, CVE-2020-10724, CVE-2020-10725 and
CVE-2020-10726, this DPDK version is strongly recommended to be used.
* New 'ovs-appctl dpdk/log-list' and 'ovs-appctl dpdk/log-set' commands
to list and change log levels in DPDK components.
* Vhost-user Dequeue zero-copy support is deprecated and will be removed
in the next release.
- Linux datapath:
* Support for kernel versions up to 5.5.x.
- AF_XDP:
* New netdev class 'afxdp-nonpmd' for netdev-afxdp to save CPU cycles
by enabling interrupt mode.
- Userspace datapath:
* Removed artificial datapath flow limit that was 65536.
Now number of datapath flows is fully controlled by revalidators and the
'other_config:flow-limit' knob.
* Add support for conntrack zone-based timeout policy.
* New configuration knob 'other_config:lb-output-action' for bond ports
that enables new datapath action 'lb_output' to avoid recirculation
in balance-tcp mode. Disabled by default.
* Add runtime CPU ISA detection to allow optimized ISA functions
* Add support for dynamically changing DPCLS subtable lookup functions
* Add ISA optimized DPCLS lookup function using AVX512
- New configuration knob 'other_config:bond-primary' for AB bonds
that specifies interface will be the preferred port if it is active.
- Tunnels: TC Flower offload
* Tunnel Local endpoint address masked match are supported.
* Tunnel Romte endpoint address masked match are supported.
- GTP-U Tunnel Protocol
* Add two new fields: tun_gtpu_flags, tun_gtpu_msgtype.
* Only support for userspace datapath.
v2.13.0 - 14 Feb 2020
---------------------
- OVN:
* OVN has been removed from this repository. It now exists as a
separate project. You can find it at
https://github.com/ovn-org/ovn.git
- Userspace datapath:
* Add option to enable, disable and query TCP sequence checking in
conntrack.
* Add support for conntrack zone limits.
* Command "ovs-appctl dpctl/dump-flows" refactored to show subtable
miniflow bits for userspace datapath.
- AF_XDP:
* New option 'use-need-wakeup' for netdev-afxdp to control enabling
of corresponding 'need_wakeup' flag in AF_XDP rings. Enabled by default
if supported by libbpf.
* 'xdpmode' option for netdev-afxdp renamed to 'xdp-mode'.
Modes also updated. New values:
native-with-zerocopy - former DRV
native - new one, DRV without zero-copy
generic - former SKB
best-effort [default] - new one, chooses the best available from
3 above modes
- DPDK:
* DPDK pdump packet capture support disabled by default. New configure
option '--enable-dpdk-pdump' to enable it.
* DPDK pdump support is deprecated and will be removed in next releases.
* DPDK ring ports (dpdkr) are deprecated and will be removed in next
releases.
* Add support for DPDK 19.11.
* Add hardware offload support for output, drop, set of MAC, IPv4 and
TCP/UDP ports actions (experimental).
* Add experimental support for TSO.
- RSTP:
* The rstp_statistics column in Port table will only be updated every
stats-update-interval configured in Open_vSwitch table.
- OVSDB:
* When ovsdb-server is running in backup mode, the default value of probe
interval is increased to 60 seconds for the connection to the
replication server. This value is configurable with the unixctl
command - ovsdb-server/set-active-ovsdb-server-probe-interval.
* ovsdb-server: New OVSDB extension to allow clients to specify row UUIDs.
- 'ovs-appctl dpctl/dump-flows' can now show offloaded=partial for
partially offloaded flows, dp:dpdk for fully offloaded by dpdk, and
type filter supports new filters: "dpdk" and "partially-offloaded".
- Add new argument '--offload-stats' for command
'ovs-appctl bridge/dump-flows',
so it can display offloaded packets statistics.
v2.12.0 - 03 Sep 2019
---------------------
- DPDK:
* New option 'other_config:dpdk-socket-limit' to limit amount of
hugepage memory that can be used by DPDK.
* Add support for vHost Post-copy Live Migration (experimental).
* OVS validated with DPDK 18.11.2 which is the new minimal supported
version.
* DPDK 18.11.1 and lower is no longer supported.
* New option 'tx-retries-max' to set the maximum amount of vhost tx
retries that can be made.
- OpenFlow:
* All features required by OpenFlow 1.5 are now implemented, so
ovs-vswitchd now enables OpenFlow 1.5 by default (in addition to
OpenFlow 1.0 to 1.4).
* Removed support for OpenFlow 1.6 (draft), which ONF abandoned.
* New action "check_pkt_larger".
* Support for OpenFlow 1.5 "meter" action.
- Userspace datapath:
* ICMPv6 ND enhancements: support for match and set ND options type
and reserved fields.
* Add v4/v6 fragmentation support for conntrack.
* New ovs-appctl "dpctl/ipf-set-enabled" and "dpctl/ipf-set-disabled"
commands for userspace datapath conntrack fragmentation support.
* New "ovs-appctl dpctl/ipf-set-min-frag" command for userspace
datapath conntrack fragmentation support.
* New "ovs-appctl dpctl/ipf-set-max-nfrags" command for userspace datapath
conntrack fragmentation support.
* New "ovs-appctl dpctl/ipf-get-status" command for userspace datapath
conntrack fragmentation support.
* New action "check_pkt_len".
* Port configuration with "other-config:priority-tags" now has a mode
that retains the 802.1Q header even if VLAN and priority are both zero.
* 'ovs-appctl exit' now implies cleanup of non-internal ports in userspace
datapath regardless of '--cleanup' option. Use '--cleanup' to remove
internal ports too.
* Removed experimental tag for SMC cache.
* Datapath classifer code refactored to enable function pointers to select
the lookup implementation at runtime. This enables specialization of
specific subtables based on the miniflow attributes, enhancing the
performance of the subtable search.
* Add Linux AF_XDP support through a new experimental netdev type "afxdp".
- OVSDB:
* OVSDB clients can now resynchronize with clustered servers much more
quickly after a brief disconnection, saving bandwidth and CPU time.
See section 4.1.15 of ovsdb-server(7) for details of related OVSDB
protocol extension.
* Support to convert from cluster database to standalone database is now
available when clustered is down and cannot be revived using ovsdb-tool
. Check "Database Migration Commands" in ovsdb-tool man section.
- OVN:
* IPAM/MACAM:
- select IPAM mac_prefix in a random manner if not provided by the user
- add the capability to specify a static IPv4 and/or IPv6 address and
get the L2 one allocated dynamically using the following syntax:
ovn-nbctl lsp-set-addresses <port> "dynamic <IPv4 addr> <IPv6 addr>"
* Added the HA chassis group support.
* Added 'external' logical port support.
* Added Policy-based routing(PBR) support to create permit/deny/reroute
policies on the logical router. New table(Logical_Router_Policy) added in
OVN-NB schema. New "ovn-nbctl" commands to add/delete/list PBR policies.
* Support for Transport Zones, a way to separate chassis into
logical groups which results in tunnels only been formed between
members of the same transport zone(s).
* Support for IGMP Snooping and IGMP Querier.
- New QoS type "linux-netem" on Linux.
- Added support for TLS Server Name Indication (SNI).
- Linux datapath:
* Support for the kernel versions 4.19.x and 4.20.x.
* Support for the kernel version 5.0.x.
* Add support for conntrack zone-based timeout policy.
- 'ovs-dpctl dump-flows' is no longer suitable for dumping offloaded flows.
'ovs-appctl dpctl/dump-flows' should be used instead.
- Add L2 GRE tunnel over IPv6 support.
v2.11.0 - 19 Feb 2019
---------------------
- OpenFlow:
* OFPMP_TABLE_FEATURES_REQUEST can now modify table features.
- ovs-ofctl:
* "mod-table" command can now change OpenFlow table names.
- ovn:
* OVN-SB schema changed: duplicated IP with same Encapsulation type
is not allowed any more. Please refer to
Documentation/intro/install/ovn-upgrades.rst for the instructions
in case there are problems encountered when upgrading from an earlier
version.
* New support for IPSEC encrypted tunnels between hypervisors.
* ovn-ctl: allow passing user:group ids to the OVN daemons.
* IPAM/MACAM:
- add the capability to dynamically assign just L2 addresses
- add the capability to specify a static ip address and get the L2 one
allocated dynamically using the following syntax:
ovn-nbctl lsp-set-addresses <port> "dynamic <IP>"
- DPDK:
* Add support for DPDK 18.11
* Add support for port representors.
- Userspace datapath:
* Add option for simple round-robin based Rxq to PMD assignment.
It can be set with pmd-rxq-assign.
* Add support for Auto load balancing of PMDs (experimental)
* Added new per-port configurable option to manage EMC:
'other_config:emc-enable'.
- Add 'symmetric_l3' hash function.
- OVS now honors 'updelay' and 'downdelay' for bonds with LACP configured.
- ovs-vswitchd:
* New configuration option "offload-rebalance", that enables dynamic
rebalancing of offloaded flows.
- The environment variable OVS_SYSLOG_METHOD, if set, is now used
as the default syslog method.
- The environment variable OVS_CTL_TIMEOUT, if set, is now used
as the default timeout for control utilities.
- The environment variable OVS_RESOLV_CONF, if set, is now used
as the DNS server configuration file.
- RHEL packaging:
* OVN packages are split from OVS packages. A new spec
file - ovn-fedora.spec.in is added to generate OVN packages.
- Linux datapath:
* Support for the kernel versions 4.16.x, 4.17.x, and 4.18.x.
v2.10.0 - 18 Aug 2018
---------------------
- ovs-vswitchd and utilities now support DNS names in OpenFlow and
OVSDB remotes.
- ovs-vswitchd:
* New options --l7 and --l7-len to "ofproto/trace" command.
* Previous versions gave OpenFlow tables default names of the form
"table#". These are not helpful names for the purpose of accepting
and displaying table names, so now tables by default have no names.
* The "null" interface type, deprecated since 2013, has been removed.
* Add minimum network namespace support for Linux.
* New command "lacp/show-stats"
- ovs-ofctl:
* ovs-ofctl now accepts and display table names in place of numbers. By
default it always accepts names and in interactive use it displays them;
use --names or --no-names to override. See ovs-ofctl(8) for details.
- ovs-vsctl: New commands "add-bond-iface" and "del-bond-iface".
- ovs-dpctl:
* New commands "ct-set-limits", "ct-del-limits", and "ct-get-limits".
- OpenFlow:
* OFPT_ROLE_STATUS is now available in OpenFlow 1.3.
* OpenFlow 1.5 extensible statistics (OXS) now implemented.
* New OpenFlow 1.0 extensions for group support.
* Default selection method for select groups is now dp_hash with improved
accuracy.
- Linux datapath
* Add support for compiling OVS with the latest Linux 4.14 kernel.
* Added support for meters.
* Add support for conntrack zone limit.
- ovn:
* Implemented icmp4/icmp6/tcp_reset actions in order to drop the packet
and reply with a RST for TCP or ICMPv4/ICMPv6 unreachable message for
other IPv4/IPv6-based protocols whenever a reject ACL rule is hit.
* ACL match conditions can now match on Port_Groups as well as address
sets that are automatically generated by Port_Groups. ACLs can be
applied directly to Port_Groups as well.
* ovn-nbctl can now run as a daemon (long-lived, background process).
See ovn-nbctl(8) for details.
- DPDK:
* New 'check-dpdk' Makefile target to run a new system testsuite.
See Testing topic for the details.
* Add LSC interrupt support for DPDK physical devices.
* Allow init to fail and record DPDK status/version in OVS database.
* Add experimental flow hardware offload support
* Support both shared and per port mempools for DPDK devices.
- Userspace datapath:
* Commands ovs-appctl dpif-netdev/pmd-*-show can now work on a single PMD
* Detailed PMD performance metrics available with new command
ovs-appctl dpif-netdev/pmd-perf-show
* Supervision of PMD performance metrics and logging of suspicious
iterations
* Add signature match cache (SMC) as experimental feature. When turned on,
it improves throughput when traffic has many more flows than EMC size.
- ERSPAN:
* Implemented ERSPAN protocol (draft-foschiano-erspan-00.txt) for
both kernel datapath and userspace datapath.
* Added port-based and flow-based ERSPAN tunnel port support, added
OpenFlow rules matching ERSPAN fields. See ovs-fields(7).
- ovs-pki
* ovs-pki now generates x.509 version 3 certificate. The new format adds
subjectAltName field and sets its value the same as common name (CN).
v2.9.0 - 19 Feb 2018
--------------------
- NSH implementation now conforms to latest draft (draft-ietf-sfc-nsh-28).
* Add ttl field.
* Add a new action dec_nsh_ttl.
* Enable NSH support in kernel datapath.
- OVSDB has new, experimental support for database clustering:
* New high-level documentation in ovsdb(7).
* New file format documentation for developers in ovsdb(5).
* Protocol documentation moved from ovsdb-server(1) to ovsdb-server(7).
* ovsdb-server now supports online schema conversion via
"ovsdb-client convert".
* ovsdb-server now always hosts a built-in database named _Server. See
ovsdb-server(5) for more details.
* ovsdb-client: New "get-schema-cksum", "query", "backup", "restore",
and "wait" commands. New --timeout option.
* ovsdb-tool: New "create-cluster", "join-cluster", "db-cid", "db-sid",
"db-local-address", "db-is-clustered", "db-is-standalone", "db-name",
"schema-name", "compare-versions", and "check-cluster" commands.
* ovsdb-server: New ovs-appctl commands for managing clusters.
* ovs-sandbox: New support for clustered databases.
- ovs-vsctl and other commands that display data in tables now support a
--max-column-width option to limit column width.
- No longer slow-path traffic that sends to a controller. Applications,
such as OVN ACL logging, want to send a copy of a packet to a
controller while leaving the actual packet forwarding in the datapath.
- OVN:
* The "requested-chassis" option for a logical switch port now accepts a
chassis "hostname" in addition to a chassis "name".
* IPv6
- Added support to send IPv6 Router Advertisement packets in response to
the IPv6 Router Solicitation packets from the VIF ports.
- Added support to generate Neighbor Solicitation packets using the OVN
action 'nd_ns' to resolve unknown next hop MAC addresses for the
IPv6 packets.
* Add support for QoS bandwidth limit with DPDK.
* ovn-ctl: New commands run_nb_ovsdb and run_sb_ovsdb.
* ovn-sbctl, ovn-nbctl: New options --leader-only, --no-leader-only.
- OpenFlow:
* ct_clear action is now backed by kernel datapath. Support is probed for
when OVS starts.
- Linux kernel 4.13
* Add support for compiling OVS with the latest Linux 4.13 kernel
- ovs-dpctl and related ovs-appctl commands:
* "flush-conntrack" now accept a 5-tuple to delete a specific
connection tracking entry.
* New "ct-set-maxconns", "ct-get-maxconns", and "ct-get-nconns" commands
for userspace datapath.
- No longer send packets to the Linux TAP device if it's DOWN unless it is
in another networking namespace.
- DPDK:
* Add support for DPDK v17.11
* Add support for vHost IOMMU
* New debug appctl command 'netdev-dpdk/get-mempool-info'.
* All the netdev-dpdk appctl commands described in ovs-vswitchd man page.
* Custom statistics:
- DPDK physical ports now return custom set of "dropped", "error" and
"management" statistics.
- ovs-ofctl dump-ports command now prints new of set custom statistics
if available (for OpenFlow 1.4+).
* Switch from round-robin allocation of rxq to pmd assignments to a
utilization-based allocation.
* New appctl command 'dpif-netdev/pmd-rxq-rebalance' to rebalance rxq to
pmd assignments.
* Add rxq utilization of pmd to appctl 'dpif-netdev/pmd-rxq-show'.
* Add support for vHost dequeue zero copy (experimental).
- Userspace datapath:
* Output packet batching support.
- vswitchd:
* Datapath IDs may now be specified as 0x1 (etc.) instead of 16 digits.
* Configuring a controller, or unconfiguring all controllers, now deletes
all groups and meters (as well as all flows).
- New --enable-sparse configure option enables "sparse" checking by default.
- Added additional information to vhost-user status.
v2.8.0 - 31 Aug 2017
--------------------
- ovs-ofctl:
* ovs-ofctl can now accept and display port names in place of numbers. By
default it always accepts names and in interactive use it displays them;
use --names or --no-names to override. See ovs-ofctl(8) for details.
* "ovs-ofctl dump-flows" now accepts --no-stats to omit flow statistics.
- New ovs-dpctl command "ct-stats-show" to show connection tracking stats.
- Tunnels:
* Added support to set packet mark for tunnel endpoint using
`egress_pkt_mark` OVSDB option.
* When using Linux kernel datapath tunnels may be created using rtnetlink.
This will allow us to take advantage of new tunnel features without
having to make changes to the vport modules.
- EMC insertion probability is reduced to 1% and is configurable via
the new 'other_config:emc-insert-inv-prob' option.
- DPDK:
* DPDK log messages redirected to OVS logging subsystem.
Log level can be changed in a usual OVS way using
'ovs-appctl vlog' commands for 'dpdk' module. Lower bound
still can be configured via extra arguments for DPDK EAL.
* dpdkvhostuser ports are marked as deprecated. They will be removed
in an upcoming release.
* Support for DPDK v17.05.1.
- IPFIX now provides additional counters:
* Total counters since metering process startup.
* Per-flow TCP flag counters.
* Multicast, broadcast, and unicast counters.
- New support for multiple VLANs (802.1ad or "QinQ"), including a new
"dot1q-tunnel" port VLAN mode.
- In ovn-vsctl and vtep-ctl, record UUIDs in commands may now be
abbreviated to 4 hex digits.
- Userspace Datapath:
* Added NAT support for userspace datapath.
* Added FTP and TFTP support with NAT for userspace datapath.
* Experimental NSH (Network Service Header) support in userspace datapath.
- OVN:
* New built-in DNS support.
* IPAM for IPv4 can now exclude user-defined addresses from assignment.
* IPAM can now assign IPv6 addresses.
* Make the DHCPv4 router setting optional.
* Gratuitous ARP for NAT addresses on a distributed logical router.