Data Plane Development Kit
{{short description|Open source software project}}
{{Use dmy dates|date=March 2015}}
{{Infobox software
| name = DPDK
| logo = Data Plane Development Kit.png
| latest_release_version = 25.03
| latest_release_date = {{start date|df=yes|2025|03|24}}{{cite web
| url = http://core.dpdk.org/download/
| title = DPDK
| website = core.dpdk.org
}}
| operating_system = Linux, FreeBSD, Windows
| genre = Packet processing
| programming_language = C
| repo = {{URL|git.dpdk.org}}
| license = BSD
| website = {{URL|www.dpdk.org}}
}}
The Data Plane Development Kit (DPDK) is an open source software project managed by the Linux Foundation. It provides a set of data plane libraries and network interface controller polling-mode drivers for offloading TCP packet processing from the operating system kernel to processes running in user space. This offloading achieves higher computing efficiency and higher packet throughput than is possible using the interrupt-driven processing provided in the kernel.
DPDK provides a programming framework for x86, ARM, and PowerPC processors and enables faster development of high speed data packet networking applications.Simon Stanley,[http://www.heavyreading.com/commchip/document.asp?doc_id=228565 All Change for Packet Processing] {{Webarchive|url=https://web.archive.org/web/20160821215058/http://www.heavyreading.com/commchip/document.asp?doc_id=228565 |date=21 August 2016 }}, Heavy Reading, 2013Shamus McGillicudy, [http://searchsdn.techtarget.com/news/2240182264/Intel-DPDK-switch-and-server-ref-designs-push-SDN-ecosystem-forward DPDK, switch and server ref designs push SDN ecosystem forward] {{Webarchive|url=https://web.archive.org/web/20150918212638/http://searchsdn.techtarget.com/news/2240182264/Intel-DPDK-switch-and-server-ref-designs-push-SDN-ecosystem-forward |date=18 September 2015 }}, SearchSDN, April 2013 It scales from mobile processors, such as Intel Atom, to server-grade processors, such as Intel Xeon. It supports instruction set architectures such as Intel, IBM POWER8, EZchip, and ARM.{{cite web|title=DPDK: Data Plane Development Kit – What it is|url=http://dpdk.org/|website=dpdk.org|accessdate=29 March 2016}} It is provided and supported under the open-sourceSimon Stanley,[http://embedded.communities.intel.com/community/en/software/blog/2013/05/16/roving-reporter-dpdk-goes-open-source DPDK Goes Open-Source], Intel Embedded Community, May 2013 BSD license.
DPDK was created by Intel engineer Venky Venkatesan, who is affectionately known as "The Father of DPDK." He died in 2018 after a long battle with cancer.{{Cite web |title=In Loving Memory: Venky Venkatesan, "The Father of DPDK" |url=https://www.dpdk.org/about/venky/ |access-date=2022-05-12 |website=DPDK |language=en-US}}
Overview
The DPDK framework creates a set of libraries for specific hardware/software environments through the creation of an Environment Abstraction Layer (EAL).DPDK Docs, [http://dpdk.org/doc/guides/prog_guide/ Data Plane Development Kit: Programmers Guide], September 2017{{Cite web|url=https://codilime.com/how-can-dpdk-access-devices-from-user-space/|title=How can DPDK access devices from user space?|date=2019-08-22|website=CodiLime|language=en-US|access-date=2019-08-28}} The EAL hides the environment specifics and provides a standard programming interface to libraries, available hardware accelerators and other hardware and operating system (Linux, FreeBSD) elements. Once the EAL is created for a specific environment, developers link to the library to create their applications. For instance, EAL provides the frameworks to support Linux, FreeBSD, Intel IA-32 or 64-bit, IBM POWER9 and ARM 32- or 64-bit.
The EAL also provides additional services including time references, generic bus access, trace and debug functions and alarm operations.
Using DPDK libraries one can implement a low overhead run-to-completion, pipeline or staged, event driven, or hybrid model completely in userspace eliminating kernel and kernel to user copy. Hardware assists from NIC/Regex/Accelerators, libraries enhanced to make use of Intelligence Storage Acceleration (ISA){{Cite web|title=How DPDK can Deflate your Data! {{!}} SNIA|url=https://www.snia.org/educational-library/how-dpdk-can-deflate-your-data-2018|access-date=2021-06-21|website=www.snia.org}} for bulk performance and accessing devices via polling helps to eliminate the performance overhead of interrupt too. Hugepages are used for large memory pool allocation, to decrease the amount of lookups and page management.{{Cite web|last=PANTHEON.tech|date=2020-01-09|title=VPP 105: Memory Management & DPDK APIs|url=https://pantheon.tech/vector-packet-dpdk-apis/|access-date=2021-06-21|website=PANTHEON.tech|language=en-US}}
The DPDK also includes software examples that highlight best practices for software architecture, tips for data structure design and storage, application profiling and performance tuning utilities and tips that address common network performance deficits.
Libraries
The DPDK includes data plane libraries and optimized network interface controller (NIC) drivers for the following:Intel Communications Infrastructure Division, [http://www.intel.com/content/dam/www/public/us/en/documents/presentation/dpdk-packet-processing-ia-overview-presentation.pdf Data Plane Development Kit Overview], December 2012
- A queue manager implements lockless queues
- A buffer manager pre-allocates fixed size buffers
- A memory manager allocates pools of objects in memory and uses a ring to store free objects; ensures that objects are spread equally on all DRAM channels
- Poll mode drivers (PMD) are designed to work without asynchronous notifications, reducing overhead
- A packet framework – a set of libraries that are helpers to develop packet processing
All libraries are stored in the dpdk/lib/librte_* directories
=Plugins=
The DPDK includes drivers for many hardware types."[http://dpdk.org/doc/nics Supported NICS]" There have been some additional out-of-tree plugin drivers in the past, which are now considered deprecated.
- {{mono|librte_pmd_vmxnet3.so}}{{snd}} provides PMD Ethernet layer supporting Vmxnet3 paravirtualized NIC; superseded by full VMXNET3 support in native DPDK.
- {{mono|librte_pmd_memnic_copy.so}}{{snd}} provides a Virtual PMD Ethernet layer through shared memory based on 2 memory copies of packets
Environment
The DPDK was originally designed to run using a bare-metal mode which is currently deprecated. DPDK's EAL provides support for Linux or FreeBSD userland application.{{fact|date=July 2022}}
EAL can be extended in order to support any processors.{{fact|date=July 2022}}
Ecosystem
DPDK is now an open-source project under the Linux Foundation, supported by many companies. DPDK is governed by a Governing Board. The technical activities are overseen by a Technical Board.[http://dpdk.org/about/techboard DPDK Technical Board] Beside Intel, which is a contributor to the DPDK, several other vendors also support the DPDK within their products and some offer additional training, support and professional services. The list of vendors who have announced DPDK support includes: 6WIND,PRWeb, [http://www.prweb.com/releases/2011/9/prweb8785683.htm 6WIND Extends Portable Packet Processing Software to Support Data Plane Development Kit] {{Webarchive|url=https://web.archive.org/web/20160326063326/http://www.prweb.com/releases/2011/9/prweb8785683.htm |date=26 March 2016 }}, September 2011 ALTEN Calsoft Labs,{{citation|url=http://www.calsoftlabs.com/mediaroom/news.asp?NewsId=133|title=Calsoft Labs to offer professional services and support for Data Plane Development Kit|publisher=ALTEN Calsoft Labs|accessdate=2014-10-28|date=18 February 2014|archive-date=4 March 2016|archive-url=https://web.archive.org/web/20160304201111/http://www.calsoftlabs.com/mediaroom/news.asp?NewsId=133|url-status=dead}}https://builders.intel.com/docs/ALTEN-Calsoft-Labs-and-Intel-Improving-Network-Agility-with-Virtual-CPE.pdf {{Bare URL PDF|date=March 2022}} Advantech,COTS Journal, [http://www.cotsjournalonline.com/articles/view/102520 ATCA Blade Serves Up Xeon E5-2600 Processor] {{Webarchive|url=https://web.archive.org/web/20160304040038/http://www.cotsjournalonline.com/articles/view/102520 |date=4 March 2016 }}, June 2012 Brocade,[http://www.brocade.com/en/products-services/software-networking/network-functions-virtualization/5600-vrouter.html Brocade vRouter] Big Switch Networks, Mellanox Technologies,{{Cite web|last=Technologies|first=Mellanox|title=Data Plane Development Kit (DPDK) {{!}} Poll Mode Driver (PMD)|url=https://www.mellanox.com/products/products/software/accelerator-software/pmd-for-dpdk|access-date=2021-02-10|website=Mellanox|language=en}} Radisys,MarketWatch, [http://www.marketwatch.com/story/radisys-delivers-industrys-first-40g-solution-for-intelr-data-plane-development-kit-2012-09-10 Radisys Delivers Industry's First 40G Solution for Data Plane Development Kit], September 2012 Tieto,Tieto, [https://www.dpdk.org/media-coverage/2012/02/27/tieto-announces-dpdk-support/ Tieto provides professional software services and support for the Data Plane Development Kit], February 2012 Wind River,Reuters, [https://archive.today/20130620032122/http://www.reuters.com/article/2012/05/22/idUS129768+22-May-2012+BW20120522 Wind River Delivers Support and Services for Data Plane Development Kit for High-Performance Packet Processing], May 2012 Lanner Inc.{{citation|url=http://www.lannerinc.com/news-and-events/latest-news/get-flying-with-intel-data-plane-development-kit|title=Get Flying with the Data Plane Development Kit|publisher=Lanner Electronics Inc.|accessdate=2013-07-11|date=20 February 2013|archive-date=6 December 2015|archive-url=https://web.archive.org/web/20151206215944/http://www.lannerinc.com/news-and-events/latest-news/get-flying-with-intel-data-plane-development-kit|url-status=dead}} and NXP.{{citation|url=http://core.dpdk.org/training/|title=NXP Platform support in Data Plane Development Kit}}
Projects
The pfSense project published a road map on 25 February 2015, in which developer Jim Thompson announced the rewriting of the pfSense core—including pf, network packet forwarding and shaping, link bonding, IPsec—using DPDK: "We have a goal of being able to forward, with packet filtering at rates of at least 14.88 Mpps. This is 'line rate' on a 10 Gbps interface. There is simply no way to use today's FreeBSD (or Linux) in-kernel stacks for this type of load."{{cite web|last1=Thompson|first1=Jim|title=Further (a roadmap for pfSense)|url=https://blog.pfsense.org/?p=1588|website=blog.pfsense.org|date=25 February 2015|publisher=Electric Sheep Fencing LLC.|accessdate=21 April 2015}}
Open vSwitch (OVS) has a limited set of features running userland that can be leveraged to bypass the Linux kernel OVS processing. This use case of OVS with DPDK userland is usually named OVS-DPDK. It is mostly deployed with OpenStack Neutron but it assumes that many features and software-defined networking (SDN) capabilities of Openstack are disabled. For instance, when OVS-DPDK is used, Neutron provides a lower level of security than when OVS kernel is used (no stateful firewalling, less security group).
The FD.IO VPP platform is an extensible framework that provides out-of-the-box production quality switch/router functionality. It is the open source version of Cisco's Vector Packet Processing (VPP) technology: a high performance, packet-processing stack that can run on commodity CPUs, and can leverage the Poll Mode Drivers for both NICs and cryptographic acceleration hardware and libraries.{{cite web|title=VPP fd.io|url=https://wiki.fd.io/view/VPP/What_is_VPP%3F|website=wiki.fd.io|publisher=Linux Foundation|accessdate=29 December 2016}} VPP supports and uses the DPDK library.{{Cite web|last=PANTHEON.tech|date=2020-01-09|title=VPP 105: Memory Management & DPDK APIs|url=https://pantheon.tech/vector-packet-dpdk-apis/|access-date=2021-06-21|website=PANTHEON.tech|language=en-US}}
TRex is an open source traffic generator using DPDK. It generates L4–7 traffic based on pre-processing and smart replay of real traffic templates. TRex amplifies both client and server side traffic and can scale to 200 Gbit/s with one UCS using Intel XL710. TRex also supports multiple streams, ability to change any packet field and provides per stream statistics, latency and jitter.{{cite web|title=TRex|url=https://trex-tgn.cisco.com|publisher=Cisco Systems|accessdate=29 December 2016}}
DTS (DPDK Test Suite) is a Python-based framework for functional tests and benchmarks. It is an open-source project, started in 2014, and is hosted on dpdk.org. It supports both software traffic generators like Scapy and dpdk-pktgen, and a hardware traffic generator like Ixia.Rami Rosen, [https://lwn.net/Articles/725254 Network acceleration with DPDK], lwn.net, July 2017
DPDK has support for several SRIOV network drivers, enabling creating a PF (Physical Function) and VFs, and also to launch VMs (like QEMU VMs) and assign VFs to them using PCI Passthrough Rami Rosen, [https://www.linuxjournal.com/content/userspace-networking-dpdk Userspace Networking with DPDK], Linux Journal, April 2018.
DDP (Dynamic Device Personalization) is one of the new advanced features implemented with DPDK. It allows you to load
firmware for a device dynamically, without resetting the host.Rami Rosen, [http://docs.wixstatic.com/ugd/295986_90bce51e5ed3422dae12c999a8dac9ad.pdf DPDK in depth], Kernel TLV, August 2018
See also
References
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{{Routing software}}
{{Linux Foundation}}
Category:Free routing software