DSP0236 Management Component Transport Protocol (MCTP) Base Specification
Version 1.3.0 Published 3
CONTENTS
Foreword ....................................................................................................................................................... 6
Introduction.................................................................................................................................................... 7
1 Scope .................................................................................................................................................... 9
2 Normative references ............................................................................................................................ 9
2.1 Approved references................................................................................................................... 9
2.2 Other references ......................................................................................................................... 9
3 Terms and definitions .......................................................................................................................... 10
3.1 Requirement term definitions .................................................................................................... 10
3.2 MCTP term definitions .............................................................................................................. 12
4 Symbols and abbreviated terms .......................................................................................................... 18
5 Conventions ........................................................................................................................................ 21
5.1 Byte ordering ............................................................................................................................. 21
5.2 Reserved fields ......................................................................................................................... 21
6 Management component relationships ............................................................................................... 21
7 MCTP overview ................................................................................................................................... 21
8 MCTP base protocol ............................................................................................................................ 25
8.1 MCTP packet fields ................................................................................................................... 25
8.2 Special endpoint IDs ................................................................................................................. 27
8.3 Packet payload and transmission unit sizes ............................................................................. 28
8.4 Maximum message body sizes ................................................................................................. 28
8.5 Message assembly ................................................................................................................... 28
8.6 Dropped packets ....................................................................................................................... 29
8.7 Starting message assembly ...................................................................................................... 29
8.8 Terminating message assembly/dropped messages ............................................................... 29
8.9 Dropped messages ................................................................................................................... 30
8.10 MCTP versioning and message type support ........................................................................... 31
8.11 MCTP message types............................................................................................................... 32
8.12 Security ..................................................................................................................................... 32
8.13 Limitations ................................................................................................................................. 32
8.14 MCTP discovery and addressing .............................................................................................. 33
8.15 Devices with multiple media interfaces ..................................................................................... 34
8.16 Peer transactions ...................................................................................................................... 34
8.17 Endpoint ID assignment and endpoint ID pools ....................................................................... 34
8.18 Handling reassigned EIDs ........................................................................................................ 39
9 MCTP bridging .................................................................................................................................... 40
9.2 Bridge and routing table examples ........................................................................................... 48
9.3 Endpoint ID resolution............................................................................................................... 52
9.4 Bridge and bus owner implementation recommendations........................................................ 54
9.5 Path and transmission unit discovery ....................................................................................... 55
9.6 Path transmission unit requirements for bridges ...................................................................... 58
10 Rate limiting ......................................................................................................................................... 59
11 MCTP control protocol ......................................................................................................................... 62
11.1 Terminology .............................................................................................................................. 62
11.2 MCTP control message format ................................................................................................. 63
11.3 MCTP control message fields ................................................................................................... 64
11.4 MCTP control message transmission unit size ......................................................................... 65
11.5 Tag Owner (TO), Request (Rq), and Datagram (D) bit usage.................................................. 65
11.6 Concurrent command processing ............................................................................................. 66
12 MCTP control messages ..................................................................................................................... 66
12.1 MCTP control message command codes ................................................................................. 66
12.2 MCTP control message completion codes ............................................................................... 69
