Re: Request to add MCTP and PCI_DOE to PCAP link type

[Michael Richardson via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Michael Richardson <mcr () sandelman ca>
>
> Date: Mon, 25 Jan 2021 10:21:07 -0500
>
> Yao, Jiewen via tcpdump-workers <tcpdump-workers () lists tcpdump org> wrote:
>     > Hello Any response ?
>
>     > Thank you Yao Jiewen
>
> ...
> Hi, sorry abotu that.
>
>     > Hi I write this email to request to below 2 link types.
>
>
>     >   1.  MCTP
>
>     > Management Component Transport Protocol (MCTP) is an industry standard
>     > defined by Distributed Management Task Force (DMTF) Platform Management
>     > Communication Interface (PMCI) working group
>     > (https://www.dmtf.org/standards/pmci)
>
>     > DSP0236
>     > (https://www.dmtf.org/sites/default/files/standards/documents/DSP0236_1.3.1.pdf)
>     > is the Management Component Transport Protocol (MCTP) Base
>     > Specification. It defines the MCTP transport header.  DSP0239
>     > (https://www.dmtf.org/sites/default/files/standards/documents/DSP0239_1.7.0.pdf)
>     > defines the Management Component Transport Protocol (MCTP) IDs and
>     > Codes. It defines the MCTP message type in a MCTP packet payload.
>
>     > Proposal:
>
>     > LINKTYPE_ name LINKTYPE_ value Corresponding DLT_ name Description
>     > LINKTYPE_MCTP XXX DLT_MCTP MCTP packet is defined in DMTF PMCI working
>     > group Management Component Transport Protocol (MCTP) Base
>     > Specification(https://www.dmtf.org/sites/default/files/standards/documents/DSP0236_1.3.1.pdf)
>     > 8.1 MCTP packet fields. It starts with MCTP transport header in Figure
>     > 4 - Generic message fields.
>
> These descriptions look great.
> Why not follow https://github.com/the-tcpdump-group/libpcap/blob/master/doc/DLT_ALLOCATE_HOWTO.md
> and send a pull request?
>
>     >   1.  PCI_DOE
>
>     > PCI Data Object Exchange (DOE) is an industry standard defined by
>     > PCI-SIG (https://pcisig.com/) Data Object Exchange (DOE)
>     > ECN<https://members.pcisig.com/wg/PCI-SIG/document/14143>
>     > (https://members.pcisig.com/wg/PCI-SIG/document/14143).
>
> This link is behind some kind of paywall.
> Maybe there is a public definition we can refer to?
>
>     > Proposal:
>
>     > LINKTYPE_ name LINKTYPE_ value Corresponding DLT_ name Description
>     > LINKTYPE_PCI_DOE XXX DLT_PCI_DOE PCI Data Object Exchange (DOE) is
>     > defined in PCI-SIG Data Object Exchange (DOE) ECN
>     > (https://members.pcisig.com/wg/PCI-SIG/document/14143) 6.xx.1 Data
>     > Objects. It starts with DOE Data Object Header 1 in Figure 6-x1: DOE
>     > Data Object Format.
>
>
>
>     > The reason I submit this request is because we are implementing a
>     > "SpdmDump" tool to dump the SPDM message defined in DMTF PMCI Security
>     > Protocol and Data Model (SPDM) Specification DSP0274
>     > (https://www.dmtf.org/sites/default/files/standards/documents/DSP0274_1.1.0.pdf).
>     > SPDM is similar to network Transport Layer Security (TLS) protocol. It
>     > is a transport layer protocol.  The MCTP and the PCI_DOE are the
>     > transport layer binding to send message to hardware device (MCTP
>     > capable device or PCI_DOE capable device).
>
>     > We did a prototype for the SpdmDump tool
>     > (https://github.com/jyao1/openspdm/blob/master/Doc/SpdmDump.md). We can
>     > generate a PCAP file and parse it offline.  In our prototype, we use
>     > below definition: #define LINKTYPE_MCTP 290 // 0x0122 #define
>     > LINKTYPE_PCI_DOE 291 // 0x0123 If you can assign same number, it will
>     > be great.  If different number is assigned, we will change our
>     > implementation accordingly.
>
>     > Thank you Yao Jiewen
>
>
>
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