Enquiry for ERROR Param 1 & 2 before GET_CAPABILITIES

[owen126315]

The original order of SPDM emu:

1. GET_VERSION
2. GET_CAPABILITIES
3. NEGOTIATE_ALGORITHMS
4. GET_DIGESTS
5. GET_CERTIFICATE
6. CHALLENGE
7. GET_MEASUREMENTS

I tried to shuffle the SPDM requests order as below:

1. GET_MEASUREMENTS
2. CHALLENGE
3. GET_CERTIFICATE
4. GET_DIGESTS
5. NEGOTIATE_ALGORITHMS
6. GET_CAPABILITIES
7. GET_VERSION

I expected to have ERROR(UnexpectedRequest), but turns out most of the responds were ERROR(VersionMismatch).

Is that a bug? Or just a misunderstanding of the SPDM spec?

[steven-bellock]

See DMTF/libspdm#2213. Note that the SPDM specification has normative language for error codes for only a few conditions / scenarios. The rest it leaves up to the endpoint implementer.