Simplify encode/decode for PLDM bios commands

The encode/decode for PLDM bios commands was implemented
using extensive pointer arithmetic and memcpys. To reduce
the pointer usage and also for the simple assignments,
structures have been created for each of the PLDM bios commands.

Change-Id: I34aff3ee817c6c09a28556bd2fd8b60d07374ad2
Signed-off-by: Priyanga <priyram1@in.ibm.com>
2 files changed
tree: 67df1ab1fad7cdfc5a309bf92cc265d053f84407
  1. libpldm/
  2. libpldmresponder/
  3. oem/
  4. test/
  5. .clang-format
  6. .gitignore
  7. .lcovrc
  8. bootstrap.sh
  9. configure.ac
  10. LICENSE
  11. MAINTAINERS
  12. Makefile.am
  13. README.md
README.md

Code Organization

At a high-level, code in this repository belongs to one of the following three components.

libpldm

This is a library which deals with the encoding and decoding of PLDM messages. It should be possible to use this library by projects other than OpenBMC, and hence certain constraints apply to it:

  • keeping it light weight
  • implementation in C
  • minimal dynamic memory allocations
  • endian-safe
  • no OpenBMC specific dependencies

Source files are named according to the PLDM Type, for eg base.[h/c], fru.[h/c], etc.

Given a PLDM command "foo", the library will provide the following API: For the Requester function:

encode_foo_req() - encode a foo request
decode_foo_resp() - decode a response to foo

For the Responder function:

decode_foo_req() - decode a foo request
encode_foo_resp() - encode a response to foo

The library also provides API to pack and unpack PLDM headers.

libpldmresponder

This library provides handlers for incoming PLDM request messages. It provides for a registration as well as a plug-in mechanism. The library is implemented in modern C++, and handles OpenBMC's platform specifics.

The handlers are of the form

Response handler(Request payload, size_t payloadLen)

Source files are named according to the PLDM Type, for eg base.[hpp/cpp], fru.[hpp/cpp], etc.

OEM/vendor-specific functions

This will support OEM or vendor-specific functions and semantic information. Following directory structure has to be used:

    pldm repo
     |---- oem
            |----<oem_name>
                      |----libpldm
                            |----<oem based encoding and decoding files>
                      |----libpldmresponder
                            |---<oem based handler files>

<oem_name> - This folder must be created with the name of the OEM/vendor in lower case. Folders named libpldm and libpldmresponder must be created under the folder <oem_name>

Files having the oem functionality for the libpldm library should be placed under the folder oem/<oem_name>/libpldm. They must be adhering to the rules mentioned under the libpldm section above.

Files having the oem functionality for the libpldmresponder library should be placed under the folder oem/<oem_name>/libpldmresponder. They must be adhering to the rules mentioned under the libpldmresponder section above.

Once the above is done a conditional flag has to be created in the configure.ac to enable conditional compilation.

For consistency would recommend using "--enable-oem-<oem_name>".

The Makefile.am files in libpldm and libpldmresponder will need to be changed to allow conditional compilation of the code.

TODO

Consider hosting libpldm above in a repo of its own, probably even outside the OpenBMC project? A separate repo would enable something like git submodule.

Flows

This section documents important code flow paths.

BMC as PLDM responder

a) PLDM daemon receives PLDM request message from underlying transport (MCTP).

b) PLDM daemon routes message to message handler, based on the PLDM command.

c) Message handler decodes request payload into various field(s) of the request message. It can make use of a decode_foo_req() API, and doesn't have to perform deserialization of the request payload by itself.

d) Message handler works with the request field(s) and generates response field(s).

e) Message handler prepares a response message. It can make use of an encode_foo_resp() API, and doesn't have to perform the serialization of the response field(s) by itself.

f) The PLDM daemon sends the response message prepared at step e) to the remote PLDM device.

BMC as PLDM requester

a) A BMC PLDM requester app prepares a PLDM request message. There would be several requester apps (based on functionality/PLDM remote device). Each of them needn't bother with the serialization of request field(s), and can instead make use of an encode_foo_req() API.

b) BMC requester app requests PLDM daemon to send the request message to remote PLDM device.

c) Once the PLDM daemon receives a corresponding response message, it notifies the requester app.

d) The requester app has to work with the response field(s). It can make use of a decode_foo_resp() API to deserialize the response message.