spdm_responder_lib cannot identify capability conflict of DATA_TRANSFER_SIZE and MAX_SPDM_MSG_SIZE for SPDM version 1.0 & 1.1

[owen126315]

I ran the spdm_responder_validator test case 7.1 with below Responder settings:

Requester

• SPDM (as the setup function)
• DATA_TRANSFER_SIZE = 256
• MAX_SPDM_MSG_SIZE = 0x1200 (this is conflict with DATA_TRANSFER_SIZE)

Responder

• SPDM 1.3
• DATA_TRANSFER_SIZE = 256
• MAX_SPDM_MSG_SIZE = 0x1200
• CHUNK_CAP = 1

The _libspdm_get_responsecapabilities seems cannot detect the conflict while handling get capability. How should the responder handle this?

[steven-bellock]

What SPDM version(s) does the Requester support? If it's the https://github.com/DMTF/SPDM-Responder-Validator then it cannot talk to a 1.3-only Responder since we haven't updated Responder Validator to 1.3 yet.

[owen126315]

The problem still here even responder is 1.2.

[owen126315]

I guess the root cause is can both requester and responder support chunk, not SPDM version. the DATA_TRANSFER_SIZE and MAX_SPDM_MSG_SIZE must be equal if chunk is not support. And libspdm_get_response_capabilities never check these two parameters when request.version = 1.0.

[steven-bellock]

Those two fields, and chunking, did not exist until SPDM 1.2.