This is a fork of Open vSwitch. In this code repo, we focus on the DPDK based Open vSwitch including our own bugfixes and feature enhancements.
Currently, we have implemeneted a non-distrupted upgrade for ovs-dpdk running on Mellenox CX5 NICs.
We've also implemented VXLAN decap/encap NIC offloading in the code. The impelementation is different from the community version, because at the time the community repo does not support this.
For the bugfixes and other features in developing, we will first introduce them into this repo and then try to contribute to the OVS community.
The reason we open source this repo is to try to have devoloping agility for our internal services, while not closing the door from the upstream community.
We will update this fork to merge the bugfixes code from the upstream community from time to time, and we welcome anyone provide feedbacks or suggestions to us.
- Non-distrupted upgrade on MLNX nics (cx4/cx5)
- VXLAN decap/encap full offload, (tested on cx5)
- VXLAN TSO
- Partial offload is currently removed, but will be added back if needed.
Open vSwitch is a multilayer software switch licensed under the open source Apache 2 license. Our goal is to implement a production quality switch platform that supports standard management interfaces and opens the forwarding functions to programmatic extension and control.
Open vSwitch is well suited to function as a virtual switch in VM environments. In addition to exposing standard control and visibility interfaces to the virtual networking layer, it was designed to support distribution across multiple physical servers. Open vSwitch supports multiple Linux-based virtualization technologies including Xen/XenServer, KVM, and VirtualBox.
The bulk of the code is written in platform-independent C and is easily ported to other environments. The current release of Open vSwitch supports the following features:
- Standard 802.1Q VLAN model with trunk and access ports
- NIC bonding with or without LACP on upstream switch
- NetFlow, sFlow(R), and mirroring for increased visibility
- QoS (Quality of Service) configuration, plus policing
- Geneve, GRE, VXLAN, STT, and LISP tunneling
- 802.1ag connectivity fault management
- OpenFlow 1.0 plus numerous extensions
- Transactional configuration database with C and Python bindings
- High-performance forwarding using a Linux kernel module
The included Linux kernel module supports Linux 3.10 and up.
Open vSwitch can also operate entirely in userspace without assistance from a kernel module. This userspace implementation should be easier to port than the kernel-based switch. OVS in userspace can access Linux or DPDK devices. Note Open vSwitch with userspace datapath and non DPDK devices is considered experimental and comes with a cost in performance.
The main components of this distribution are:
- ovs-vswitchd, a daemon that implements the switch, along with a companion Linux kernel module for flow-based switching.
- ovsdb-server, a lightweight database server that ovs-vswitchd queries to obtain its configuration.
- ovs-dpctl, a tool for configuring the switch kernel module.
- Scripts and specs for building RPMs for Citrix XenServer and Red Hat Enterprise Linux. The XenServer RPMs allow Open vSwitch to be installed on a Citrix XenServer host as a drop-in replacement for its switch, with additional functionality.
- ovs-vsctl, a utility for querying and updating the configuration of ovs-vswitchd.
- ovs-appctl, a utility that sends commands to running Open vSwitch daemons.
Open vSwitch also provides some tools:
- ovs-ofctl, a utility for querying and controlling OpenFlow switches and controllers.
- ovs-pki, a utility for creating and managing the public-key infrastructure for OpenFlow switches.
- ovs-testcontroller, a simple OpenFlow controller that may be useful for testing (though not for production).
- A patch to tcpdump that enables it to parse OpenFlow messages.
To install Open vSwitch on a regular Linux or FreeBSD host, please read the installation guide. For specifics around installation on a specific platform, refer to one of the other installation guides
For answers to common questions, refer to the FAQ.
To learn about some advanced features of the Open vSwitch software switch, read the tutorial.
Each Open vSwitch userspace program is accompanied by a manpage. Many of the manpages are customized to your configuration as part of the build process, so we recommend building Open vSwitch before reading the manpages.
The following is a summary of the licensing of files in this distribution. As mentioned, Open vSwitch is licensed under the open source Apache 2 license. Some files may be marked specifically with a different license, in which case that license applies to the file in question.
Files under the datapath directory are licensed under the GNU General Public License, version 2.
File build-aux/cccl is licensed under the GNU General Public License, version 2.
- The following files are licensed under the 2-clause BSD license.
- include/windows/getopt.h lib/getopt_long.c lib/conntrack-tcp.c
- The following files are licensed under the 3-clause BSD-license
- include/windows/netinet/icmp6.h include/windows/netinet/ip6.h lib/strsep.c
Files under the xenserver directory are licensed on a file-by-file basis. Refer to each file for details.
Files lib/sflow*.[ch] are licensed under the terms of either the Sun Industry Standards Source License 1.1, that is available at:
http://host-sflow.sourceforge.net/sissl.html
- or the InMon sFlow License, that is available at:
- http://www.inmon.com/technology/sflowlicense.txt