KCS actually layer on LPC interface.
KCS is a usual BMC-to-CPU communication channel.
Does MCTP-over-KCS feature require some special LPC interface hardware changes?
Or, MCTP is just a software stack and it uses current LPC interface, not any special hardward design change requirement.
Thanks
At 2023-10-26 13:03:02, "Chang, Abner via groups.io" <abner.chang=amd.com@groups.io> wrote:
>[AMD Official Use Only - General]
>
>Merged. I will send another patch for Uncrustify updates if any.
>
>Abner
>
>> -----Original Message-----
>> From: Chang, Abner
>> Sent: Tuesday, October 24, 2023 10:44 AM
>> To: Konstantin Aladyshev <aladyshev22@gmail.com>; devel@edk2.groups.io
>> Cc: Attar, AbdulLateef (Abdul Lateef) <AbdulLateef.Attar@amd.com>;
>> nicklew@nvidia.com
>> Subject: RE: [PATCH edk2-platforms v3 00/16] MTCP-over-KCS support
>>
>> For entire V3 and the additional patch 16/16,
>> Reviewed-by: Abner Chang <abner.chang@amd.com>
>>
>> I will do the Uncrustify check and merge this patch set once the corresponding
>> edk2 changes are merged.
>> Thanks
>> Abner
>>
>> > -----Original Message-----
>> > From: Konstantin Aladyshev <aladyshev22@gmail.com>
>> > Sent: Monday, October 23, 2023 9:05 PM
>> > To: devel@edk2.groups.io
>> > Cc: Chang, Abner <Abner.Chang@amd.com>; Attar, AbdulLateef (Abdul
>> > Lateef) <AbdulLateef.Attar@amd.com>; nicklew@nvidia.com; Konstantin
>> > Aladyshev <aladyshev22@gmail.com>
>> > Subject: [PATCH edk2-platforms v3 00/16] MTCP-over-KCS support
>> >
>> > Caution: This message originated from an External Source. Use proper
>> caution
>> > when opening attachments, clicking links, or responding.
>> >
>> >
>> > The Manageability KCS transport library needs to support requests both
>> > from MCTP and IPMI transports. Currently the code only handles IPMI
>> > case correctly.
>> > In the MCTP case the communication should be based on the MCTP-over-
>> KCS
>> > specification (DSP0254). This specification defines a special KCS
>> > binding header and trailer structures that need to be present in every
>> > MCTP message.
>> > The header structure contains a length field, therefore response packet
>> > size is not needed to be known beforehand.
>> > The trailer structure contains a PEC checksum that can be used to check
>> > itegrity of the response message.
>> > Modify Manageability KCS transport library code to check which message
>> > is processed (IPMI or MCTP) and handle each case correctly based on its
>> > own specification.
>> > This patch is a result of a joint effort from the Konstantin Aladyshev
>> > <aladyshev22@gmail.com> and Abner Chang <abner.chang@amd.com>.
>> >
>> > Tested:
>> > PLDM communication between the HOST and BMC was tested with both
>> > components implemented via open-source software:
>> > - The HOST (UEFI firmware) part was based one the edk2 [1] and
>> > edk2-platforms [2] code,
>> > - The BMC part was based on the openbmc [3] distribution.
>> >
>> > The testing process and all the necessary utilities are described in
>> > the [4] repository.
>> >
>> > The provided changes keep IPMI over KCS stack working as reported by
>> > Abner Chang.
>> >
>> > [1]: https://github.com/tianocore/edk2
>> > [2]: https://github.com/tianocore/edk2-platforms
>> > [3]: https://github.com/openbmc/openbmc
>> > [4]: https://github.com/Kostr/PLDM
>> >
>> > Changes v2 -> v3:
>> > - Add new patch that adds PLDM completion code check
>> >
>> > Changes v1 -> v2:
>> > - Add new patches with corrections for the PLDM protocol. The
>> > resulting communication via EDKII_PLDM_PROTOCOL was successfully
>> > tested.
>> >
>> > Abner Chang (4):
>> > ManageabilityPkg: Add PLDM terminus PCDs
>> > PldmProtocolDxe: Correct TID argument usage
>> > ManageabilityPkg/PldmProtocol: Remove PLDM command table
>> > PldmSmbiosTransferDxe: Implement Set PLDM terminus ID API
>> >
>> > Konstantin Aladyshev (12):
>> > ManageabilityPkg: Add definition for the MCTP KCS TRAILER structure
>> > ManageabilityPkg: Check MCTP EIDs for reserved values
>> > ManageabilityPkg: Support both MCTP and IPMI in KCS tranport library
>> > ManageabilityPkg: Check header fields in the MCTP response
>> > ManageabilityPkg: Correct typo in MCTP destination EID field
>> > ManageabilityPkg: Update the algorithm of using MCTP endpoint ID PCD
>> > ManageabilityPkg: Correct value for the MCTP TAG_OWNER response bit
>> > ManageabilityPkg: Don't check MCTP header fields if transfer has
>> > failed
>> > ManageabilityPkg: Use correct constants for PLDM header checks
>> > ManageabilityPkg: Return error on multiple-packet MCTP responses
>> > ManageabilityPkg: Return error on PLDM header check fails
>> > ManageabilityPkg: Check PLDM completion code
>> >
>> > .../Include/Library/BasePldmProtocolLib.h | 16 +
>> > .../Library/ManageabilityTransportMctpLib.h | 9 +-
>> > .../Include/Protocol/MctpProtocol.h | 12 +-
>> > .../Include/Protocol/PldmProtocol.h | 18 +-
>> > .../Protocol/PldmSmbiosTransferProtocol.h | 26 ++
>> > .../Common/KcsCommon.c | 284 +++++++++++++++---
>> > .../Dxe/ManageabilityTransportMctp.c | 4 +-
>> > .../PldmProtocolLibrary/Dxe/PldmProtocolLib.c | 49 ++-
>> > .../Dxe/PldmProtocolLib.inf | 6 +-
>> > .../ManageabilityPkg/ManageabilityPkg.dec | 6 +
>> > .../MctpProtocol/Common/MctpProtocolCommon.c | 129 +++++++-
>> > .../Universal/MctpProtocol/Dxe/MctpProtocol.c | 51 +++-
>> > .../PldmProtocol/Common/PldmProtocolCommon.c | 148 +++------
>> > .../PldmProtocol/Common/PldmProtocolCommon.h | 25 +-
>> > .../Universal/PldmProtocol/Dxe/PldmProtocol.c | 69 ++++-
>> > .../PldmProtocol/Dxe/PldmProtocolDxe.inf | 4 -
>> > .../PldmSmbiosTransferDxe.c | 28 ++
>> > 17 files changed, 690 insertions(+), 194 deletions(-)
>> >
>> > --
>> > 2.34.1
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