SCLP (Segment-oriented Connection-less Protocol) is a novel L4 protocol for accelerating performance of existing tunneling protocols, such as VXLAN and NVGRE. The SCLP protocol is designed to take advantage of a GSO (Generic Segmentation Offload) and a GRO (Generic Receive Offload) features of the Linux kernel. Unlike an sclp_offload module that we have released so far, this module provides full-implementation of the SCLP protocol including Tx/Rx features, GRO/GRO support, tunneling interface for Open vSwitch. Therefore, the sclp_offload module is not needed anymore.

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• proto.c: Module's main functions

• ipv4.c: IPv4-dependent functions

• output.c: Packet transmission

• tunnel.c: Tunnel related functions (called by OVS)

• offload.c: GSO/GRO implementations

• sock_util.c: Utility functions for SCLP sockets

• frag_table.h: Fragment table definition for Rx

• frag_table.c: Fragment table implementation for Rx

• sclp_impl.h: Common function definition

• compat.h: Compatibility support

• compat/: Exported structure and function definition

• examples/: Echo and nc like applications using SCLP

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Currently, the SCLP module has been tested on the following distributions.

• Redhat Enterprise Linux 6.6, 6.7

• Redhat Enterprise Linux 7.0, 7.1 (Experimental)

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You can download the code from the GitHub repository.

https://github.com/sdnnit/sclp

To build the module, you can simply use the rpmbuild system

$ tar cvzf sclp.tar.gz sclp

$ mv sclp.tar.gz ~/rpmbuild/SOURCES

$ cd sclp

$ rpmbuild -bb rhel/sclp-rhel6.spec

If the building process succeeds, 'sclp-0.1.0-1.x86_64.rpm' file is created in ~/rpmbuild/RPMS/x86_64.

$ sudo rpm -ivh sclp-0.1.0-1.x86_64.rpm

• Note: The sclp module is automatically loaded by loading an SCLP-enabled openvswitch module. The SCLP-enabled openvswitch module can be downloaded from the following link.

  https://github.com/sdnnit/ovs-sclp

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Overview of the SCLP protocol is described in the following paper.

• R. Kawashima and H. Matsuo, "Accelerating the Performance of Software Tunneling using a Receive Offload-aware Novel L4 Protocol", IEICE Transactions on Communications, vol. E98-B, no. 11, pp. 2180-2189, 2015. [12th IEICE Communications Society Best Paper Award]

• R. Kawashima, S. Muramatsu, H. Nakayama, T. Hayashi, and H. Matsuo, "SCLP: Segment-oriented Connection-less Protocol for High-Performance Software Tunneling in Datacenter Networks", Proc. 1st IEEE Conference on Network Softwarization (NetSoft 2015), pp.1-8, London, UK, April 2015.

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Ryota Kawashima <kawa1983@ieee.org>