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研究生：	陳萬軍 Chen, Wan-Chun
論文名稱：	具可擴充性的SCTP網路協定卸載架構 A Scalable Offload Architecture for Stream Control Transmission Protocol (SCTP)
指導教授：	陳中和 Chen, Chung-ho
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電腦與通信工程研究所 Institute of Computer & Communication Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	中文
論文頁數：	87
中文關鍵詞：	SCTP 、網路、卸載引擎、可擴充性
外文關鍵詞：	SCTP, offload, network, architecture, scalable
相關次數：	點閱：66 下載：2
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在本篇論文中，我們提出了一個具可擴充性的SCTP網路卸載架構。為了達成SCTP協定的卸載，我們分析了SCTP與TCP的差異，並且比較了相關的網路協定卸載硬體實作的架構，同時參考軟體堆疊實作的方式，設計出我們的架構。
為了達到網路加速的效果，我們以硬體的方式完成所有傳送及接收的資料處理和連線管理。除了協定的處理外，為了符合各種不同規模的需求，網路卸載硬體必須提供具有可擴充性的設計。我們將硬體實現為模組化的設計，可以視需求調整並聯工作的SCTP模組個數。我們以硬體模組方式加速連線的查詢及模組的管理，並且藉由嵌入式處理器支援額外連線數的擴充。
我們在ESL設計平台上，以SystemC語言實現我們的設計，配合ARM處理器，實現了我們的設計，以目前的架構設計，每個SCTP模組可以支援16條SCTP連線同時運作。若設定在125MHz的運作時脈下，每秒可以處理15.6萬個封包。

This thesis presents the design of an SCTP network offload engine. To propose an adequate design model, we have studied the different features of SCTP and TCP, as well as surveyed several related network offload designs and the software protocol stacks. According to our studies, we propose a scalable architecture for SCTP offload.
To accelerate the network processing, the SCTP protocol is implemented as a hardware design which handles the data flow and the connection management. To provide flexibility, the SCTP hardware is designed as a scalable sub-module, so that multiple units can be parallelly arranged on the bus and work simultaneously. The dispatching speed between the SCTP modules is enhanced by the hardware design, and the expansion of connection numbers is supported by embedded processors.
The design proposed in this work is implemented under an ARM environment, on an electronic system level platform and in SystemC. In the current design, each module supports 16 SCTP connections and is able to process 156,000 packets/second when it is set at 125 MHz-clock rate.

摘要........................................................................................III
ABSTRACT..........................................................................IV
致謝..........................................................................................V
目次........................................................................................VI
表目錄....................................................................................IX
圖目錄......................................................................................X
圖目錄......................................................................................X
第1章 序論.............................................................................1
1 研究動機......................................................................................................................................................1
2 研究貢獻......................................................................................................................................................2
3 論文編排......................................................................................................................................................2
第2章 背景知識及相關作品.................................................3
1 STREAM CONTROL TRANSMISSION PROTOCOL (SCTP)協定..........................................................................3
1.1 SCTP 協定...........................................................................................................................................3
1.2 SCTP與TCP的特性比較.......................................................................................................................4
1.3 SCTP的資料格式.................................................................................................................................9
1.4 一個SCTP的關聯...............................................................................................................................12
2 針對SCTP特性之相關研究.......................................................................................................................14
2.1 多重串流...........................................................................................................................................14
2.2 多重位址...........................................................................................................................................15
2.3 具部份可信賴度的傳送.....................................................................................................................15
2.4 壅塞控制...........................................................................................................................................16
3 網路卸載....................................................................................................................................................16
3.1 網路卸載的需求................................................................................................................................16
3.2 SCTP與TCP之效能比較.....................................................................................................................17
4 相關的網路卸載實作................................................................................................................................20
4.1 An TCP/IP Offload Engine (TOE) System over Gigabit Ethernet.......................................................20
4.2 The Latona Internet Protocol Offload Engine in TCP/IP.....................................................................23
4.3 An iWARP-based Network Offload Engine.........................................................................................25
第3章 SCTP卸載引擎的架構設計....................................28
1 設計理念....................................................................................................................................................28
2 設計環境....................................................................................................................................................29
2.1 電子層級系統設計(Electronic Level System Design, ESL Design).................................................29
2.2 SystemC語言與CoWare Platform Architecture平台...........................................................................30
2.3 QEMU虛擬機器.................................................................................................................................31
3 系統層級的架構........................................................................................................................................32
3.1 系統架構...........................................................................................................................................32
3.2 硬體架構...........................................................................................................................................33
4 SCTP模組內部之架構................................................................................................................................36
4.1 概觀 (Overview)...............................................................................................................................36
4.2 暫存器檔案 (Register file)................................................................................................................37
4.3 控制模組 (Control Module)..............................................................................................................40
4.4 傳送模組 (Tx module)......................................................................................................................49
5 接收模組 (RX MODULE)............................................................................................................................50
5.2 介面模組 (Interface module).............................................................................................................52
5.3 IP/MAC模組.......................................................................................................................................54
5.4 PCI-AMBA 橋接器模組及網路驅動程式........................................................................................55
6 傳送流程....................................................................................................................................................56
7 接收流程....................................................................................................................................................57
8 結語............................................................................................................................................................59
第4章 可擴充性的設計.......................................................60
1 實現硬體設計時會面對的問題.................................................................................................................60
2 對於同時處理多條連線的設計方式.........................................................................................................61
3 對於有限的支援連線數的解決方式.........................................................................................................65
4 總結擴充性的討論....................................................................................................................................68
第5章 實作及驗證的結果...................................................70
1 實作平台....................................................................................................................................................70
2 功能性驗證................................................................................................................................................71
3 處理時間的估算方式................................................................................................................................72
4 整體效能估算............................................................................................................................................78
5 結語............................................................................................................................................................79
第6章 結論與未來目標.......................................................81
1 結論............................................................................................................................................................81
2 未來目標....................................................................................................................................................82
參考文獻.................................................................................83
                                    

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校內：2010-08-25公開
校外：2010-08-25公開

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