Functional Networking Framework for Multi-Core Architectures
C C++ Haskell Groff HTML Makefile Other
Latest commit 21ade99 Nov 14, 2016 @awgn awgn committed on GitHub Merge pull request #27 from nizq/master
Make PFQ compile on linux kernel 4.8

PFQ v5.2


PFQ is a functional networking framework designed for the Linux operating system that allows efficient packets capture/transmission (10G and beyond), in-kernel functional processing and packets steering across sockets/end-points.

PFQ is highly optimized for multi-core architecture, as well as for network devices equipped with multiple hardware queues. It works with any network device driver and provides a script designed to obtain accelerated versions starting from source code.

The framework enables the development of high-performance networking applications with different programming languages: C, C++ and Haskell. In addition, a pure functional language designed for early stages in-kernel applications is included: pfq-lang.

pfq-lang is inspired by Haskell and allows the creation of small applications that run in kernel space, on top of network device drivers. Through pfq-lang it is possible to build efficient bridges, port mirrors, simple firewalls, network balancers and so forth.

The package provides the source code of the PFQ kernel module, user-space libraries for C, C++11-14 and Haskell language, an implementation of pfq-lang as eDSL for both C++11-14 and Haskell, and a set of diagnostic tools.


  • Full lock-free architecture.
  • Preallocated pools of socket buffers.
  • Compliant with a plethora of network devices drivers.
  • Rx and Tx line-rate on 10G links (14,8 Mpps), on-top-of Intel ixgbe vanilla drivers.
  • Transparent support of kernel threads for asynchronous packets transmission.
  • Asynchronous transmission with active timestamping (which determines when to transmit a packet).
  • Concurrent monitoring of multiple multi-threaded applications by means of groups of sockets.
  • Per-group packet steering through randomized hashing or deterministic classification.
  • Per-group Berkeley and VLAN filters.
  • Functional engine for in-kernel packet processing with pfq-lang.
  • User-space libraries for C, C++11-14 and Haskell languages.
  • pfq-lang eDLS for C++11-14 and Haskell language.
  • Accelerated pcap library (line-speed tested with captop).
  • pfqd daemon used to parallelize multiple instances of pcap legacy applications.
  • pfq-omatic, a script designed to accelerate vanilla drivers.
  • I/O user<->kernel shared-memory on top of HugePages.


  • "PFQ: a Novel Engine for Multi-Gigabit Packet Capturing With Multi-Core Commodity Hardware": Best-Paper-Award at PAM2012 in Vienna
  • "A Purely Functional Approach to Packet Processing": ANCS 2014 Conference (October 2014, Marina del Rey)
  • "Network Traffic Processing with PFQ": JSAC-SI-MT/IEEE journal Special Issue on Measuring and Troubleshooting the Internet (April 2016)


Nicola Bonelli


Andrea Di Pietro

Loris Gazzarrini

Gregorio Procissi

Luca Abeni


PFQ home-page is Additional information are available at netgroup/pfq.