Coherent SDN Forwarding Plane Programming

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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

Coherent SDN Forwarding Plane Programming

Haoyu Song, Jun Gong, Hongfei Chen

Huawei Technologies, USA

HUAWEI TECHNOLOGIES CO., LTD. Page 1

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Applications

Programming

Environments

Standard/OF2.0

Protocol Oblivious Forwarding

• Evolve SDN toward fully-programmable networks and support network application innovation

• Simplified & future-proof Forwarding Elements with open & fully-programmable interface

• Data path programming with generic instructions to support any protocol and stateful service

Heterogeneous

Systems

POF Optimized

Silicon

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Programming Framework Architecture

OpenFlow 2.0

High Level

Language

Platform

Independent

Compiler

GUI/CLI Lib/TTP

APP

Conventional

ASIC SDN ASIC CPU NPU

Platform

Specific

Compiler

Platform

Specific

Compiler

Platform

Specific

Compiler

Platform

Specific

Compiler

APP APP

Platform

Optimized Lib

customized

interactive

standard

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OpenFlow 2.0 Interface as Thin Waist

• Support protocol-oblivious forwarding plane

• Agnostic to forwarding element architectures

• Support coarse-grained and fine-grained programming

• An intermediate platform-independent instruction set

• Packet/Metadata Editing: set field, add field, delete field, math/logic operations on field

• Flow Metadata Manipulation: read, write

• Algorithm/Function Procedure: checksum, fragmentation, etc.

• Table Access: go to table (non return), search table (return to calling instruction)

• Output: physical/virtual/logic port, sampling/data path generated packets

• Jump/Branching: conditional and unconditional, absolute and relative

• Active Data Path: insert/delete/modify flow entry, insert/delete flow table


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Instruction Block Instruction

Block

Abstract OF2.0 Flow Entry

Match Key Parameter Instruction Block ID

Instruction Block

Flow Metadata

Pool Counter Pool Meter Pool

• Decouple key and instruction

• Parameterize flow entry

• Shared resource pool

• FE mapping done by HAL

• Flexibility and Efficiency


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Three Programming Approaches

customized

High level language

Platform Independent

Compiler

OF2.0

interactive

GUI/CLI

OF2.0

standard

OF2.0

Library/TTP


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Four Different Target Platforms

CPU

NPU

ASIC

SDN-specific

IC

Performance

Fle

xib

ilit

y


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Design Path We Have Explored

OpenFlow 2.0

High Level

Language

Platform

Independent

Compiler

GUI/CLI Lib/TTP

APP

Conventional

ASIC SDN ASIC CPU NPU

Platform

Specific

Compiler

Platform

Specific

Compiler

Platform

Specific

Compiler

Platform

Specific

Compiler

APP APP

Platform

Optimized Lib

customized

interactive

standard

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The following nine


an example of how




only use one design


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“Typesetting

Standard”.

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Subtitle: 25-30pt


the title font

Color : R153 G0 B0


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Sub contents: 20pt


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FE Compiling vs. Interpreting

Intermediate OF instruction = API

Each OF instruction = a piece of

microcode

Simple but not efficient

Field parsing & key construction

Large microcode instruction count

Large number of thread switches

Large flow table entry size

Interpreter Mode

Instructions blocks are directly

compiled into microcode

Complex but efficient

Direct register reference

Take advantage of entry parameters

Small microcode instruction count

Small number of thread switches

Small flow table entry size

Compiler Mode


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The following nine


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NPU Case Study

Platform Huawei NE40E/5000E Router Platform

40G NPU in Run-To-Completion (RTC) mode

High level language C language

Basic IPv4 Forwarding Go-to-Table Instruction comparison

• The Compiler Mode has 2x performance advantage over the Interpreter Mode

and has the similar performance as the non-SDN implementation


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The following nine


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only use one design


For specific usage


“Typesetting

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Subtitle: 25-30pt


the title font

Color : R153 G0 B0


Medium


Contents



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Problem Diversified FEs will coexist for SDN

Unified SDN programming is needed

Our contributions Propose a unified programming framework centered on OpenFlow 2.0

Explored the design path for NPU-based FEs

Compare the compiler-mode and interpreter-mode implementations

Other findings Compiler mode is superior to interpreter mode

Prefer SDN-chips which can execute OF instruction natively

Future work Complete other design paths

Conclusions

Thank you www.huawei.com

Copyright©2014 Huawei Technologies Co., Ltd. All Rights Reserved.

The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and

operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments

to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose

only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.

Coherent SDN Forwarding Plane Programming

Technology

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