USB4Inter-DomainService.pdf资源-CSDN文库

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《USB4 Inter-Domain Service协议》是USB Promoter Group由Apple Inc., Hewlett-Packard Inc., Intel Corporation, Microsoft Corporation, Renesas Corporation, STMicroelectronics, 和Texas Instruments等多家知名IT公司共同制定的一份技术规范，发布于2021年1月31日，版本1.0。这个协议主要涉及的是USB4接口跨域服务的详细规范，旨在促进不同设备领域之间的高效通信和服务。 USB4是USB接口的最新标准，它在USB 3.x的基础上进行了重大改进，引入了更高的数据传输速度、更灵活的带宽分配以及对Thunderbolt 3协议的兼容性。其中，Inter-Domain Service（跨域服务）是USB4的一个关键特性，它允许不同设备间的通信和服务交换，包括数据传输、电源管理、设备识别和配置等功能。协议的发布伴随着知识产权免责声明，强调提供此规范不包含任何商业保证、非侵权或特定用途适用性的保证，同时明确指出，获取该规范并不自动授予任何知识产权许可。此外，鼓励用户向techadmin@usb.org发送反馈意见，而关于行业信息，可以访问USB Implementers Forum的官方网站http://www.usb.org获取。 USB4 Inter-Domain Service协议的开发过程中，AMD的Joe Scanlon、Apple Inc.的Clinton Bauder、Carlos Calderon、Thomas LaPerre、Rob McKeever、Collin Pieper、Ree等人都做出了技术贡献。这些专家的合作确保了USB4标准在实现跨域服务时的技术先进性和可靠性。在实际应用中，USB4 Inter-Domain Service协议将有助于提升设备间的兼容性，使得用户能够在不同的USB4设备之间无缝地传输大量数据，如高清视频、大容量文件等，同时优化电源管理，提高设备的能效。此外，该协议还可能涉及设备的热插拔、自动识别和配置，从而简化用户的操作流程。 USB4 Inter-Domain Service协议是USB4标准的重要组成部分，通过规范跨域服务，促进了USB4生态系统的完善，提高了设备间协同工作的效率和用户体验。这一技术的发展将对未来的个人电脑、移动设备、外设连接等方面产生深远影响。

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Universal Serial Bus 4 (USB4™) Inter-

Domain Service Protocol

Apple Inc.

Hewlett-Packard Inc.

Intel Corporation

Microsoft Corporation

Renesas Corporation

STMicroelectronics

Texas Instruments

Version 1.0

January 31, 2021

Version 1.0 - iv - Universal Serial Bus 4

January 31, 2021 Inter-Domain Service Protocol

1 Introduction .................................................................................................................................................... 1

1.1 Inter-Domain Service Overview ..................................................................................................... 1

1.2 Endian Conventions ........................................................................................................................... 2

1.3 Scope of the Specification ................................................................................................................ 3

1.4 Specification Organization ............................................................................................................... 3

1.5 Related Specifications ....................................................................................................................... 3

1.6 Conventions ......................................................................................................................................... 3

1.6.1 Precedence ............................................................................................................................ 3

1.6.2 Keywords ............................................................................................................................... 3

1.6.2.1 Informative ................................................................................................................................ 3

1.6.2.2 May ................................................................................................................................................ 3

1.6.2.3 N/A ................................................................................................................................................ 3

1.6.2.4 Normative ................................................................................................................................... 3

1.6.2.5 Optional ....................................................................................................................................... 3

1.6.2.6 Reserved ...................................................................................................................................... 3

1.6.2.7 Shall ............................................................................................................................................... 4

1.6.2.8 Should ........................................................................................................................................... 4

1.6.3 Capitalization ....................................................................................................................... 4

1.6.4 Italic Text ............................................................................................................................... 4

1.6.5 Numbering............................................................................................................................. 4

1.6.6 Bit, Byte, DW, and Symbol Conventions ........................................................................ 4

1.6.7 Implementation Notes........................................................................................................ 4

1.6.8 Pseudo Code .......................................................................................................................... 4

1.7 Reserved Values and Fields ............................................................................................................. 4

1.8 Terms and Abbreviations ................................................................................................................. 5

2 Discovery Packet Formats ........................................................................................................................... 6

2.1 Inter-Domain Packet Format ........................................................................................................... 6

2.2 Inter-Domain UUID Request Packet Format ............................................................................... 7

2.3 Inter-Domain UUID Response Packet Format ............................................................................. 8

2.4 Inter-Domain Properties Read Request Packet Format ........................................................... 8

2.5 Inter-Domain Properties Read Response Packet Format ........................................................ 9

2.6 Inter-Domain Properties Changed Notification Packet Format .......................................... 10

2.6.1 Inter-Domain Properties Changed Response Packet Format ............................... 11

2.7 Inter-Domain Error Response Packet Format ......................................................................... 11

2.8 Inter-Domain Link State Status Request Packet Format ....................................................... 12

2.9 Inter-Domain Link State Status Response Packet Format .................................................... 12

2.10 Inter-Domain Link State Change Request Packet Format ..................................................... 13

2.11 Inter-Domain Link State Change Response Packet Format .................................................. 13

3 Service Discovery ........................................................................................................................................ 14

3.1 Inter-Domain Discovery ................................................................................................................ 14

3.2 Discovery of Peer Host Properties .............................................................................................. 14

3.3 Discover Change in Inter-Domain Capabilities ........................................................................ 14

3.4 Link Management of Lane Bonding ............................................................................................ 15

Version 1.0 - v - Universal Serial Bus 4

January 31, 2021 Inter-Domain Service Protocol

3.5

Inter-Domain Error Recovery ...................................................................................................... 16

3.6 Termination of Discovery Protocol ............................................................................................ 16

4 Inter-Domain Properties ........................................................................................................................... 17

4.1 Bit, byte, and DWORD ordering ................................................................................................... 17

4.2 Properties Block .............................................................................................................................. 18

4.2.1 Properties Block Header ................................................................................................ 18

4.2.2 Generic Key-Value Entry format ................................................................................... 18

4.2.2.1 Immediate Value Entry format ........................................................................................ 19

4.2.2.2 Leaf Data Offset Entry format .......................................................................................... 19

4.2.2.3 Leaf Text Offset Entry format .......................................................................................... 20

4.2.2.4 Directory Data Offset Entry format ............................................................................... 20

4.2.3 Directory Data Entry format.......................................................................................... 20

4.2.4 Required Entries ............................................................................................................... 21

4.2.4.1 Miscellaneous .......................................................................................................................... 21

4.2.4.2 Defined Keys ............................................................................................................................ 21

4.2.5 Vendor defined keys ........................................................................................................ 22

4.2.5.1 Vendor defined types........................................................................................................... 22

4.2.6 Protecting against buffer overruns ............................................................................. 22

4.2.7 Obtaining a one to one relationship between Key and Entry ................................ 22

4.2.8 Discovery protocol layers .............................................................................................. 23

4.2.9 Sample Properties Block ................................................................................................ 23

5 Service Configuration ................................................................................................................................ 25

5.1 Ethernet over USB4 (USB4NET) .................................................................................................. 25

5.1.1 Directory Data Entry ....................................................................................................... 26

5.1.2 Packet Types ...................................................................................................................... 26

5.1.2.1 Inter-Domain USB4NET Packet ...................................................................................... 26

5.1.2.2 Inter-Domain USB4NET Login Request Packet ....................................................... 28

5.1.2.3 Inter-Domain USB4NET Login Response Packet .................................................... 29

5.1.2.4 Inter-Domain USB4NET Logout Request Packet ..................................................... 30

5.1.2.5 Inter-Domain USB4NET Logout Response Packet ................................................. 30

5.1.3 Tunneling Ethernet Packets over USB4 ...................................................................... 30

5.1.3.1 Tunneling of Ethernet frames with up to 1500B of payload ............................. 30

5.1.3.2 Tunneling of 64KB Ethernet Frames ............................................................................ 31

5.1.3.3 MAC Address ........................................................................................................................... 32

5.1.3.4 Flow Control ............................................................................................................................ 33

5.1.4 Example USB4NET Inter-Domain Properties in the Properties Block ............... 33

A Example Inter-Domain Bonding Flow ................................................................................................... 35

Figures

Figure 1-1. Connecting two USB4 Domains ................................................................................................................................ 1

Figure 1-2. Inter-Domain Service Overview .............................................................................................................................. 2

Figure 2-1. Inter-Domain Packet Format .................................................................................................................................... 6

Figure 2-2. Inter-Domain UUID Request Packet Format ...................................................................................................... 8

Figure 2-3. Inter-Domain UUID Response Packet Format ................................................................................................... 8