commit	a6a8ccd9486caf14b16320e20bc514bcda715721	[log] [tgz]
author	Sagar Srinivas <sagar.srinivas@ibm.com>	Thu Apr 01 07:58:33 2021 -0500
committer	sagar srinivas <sagar.srinivas@ibm.com>	Wed Sep 22 08:48:59 2021 +0000
tree	dc179a307e6e21093b0981ecc7dd7c56f62fe6f0
parent	2746fb48d197b25942889eca4b802000a746396d [diff]

tree: dc179a307e6e21093b0981ecc7dd7c56f62fe6f0

README.md

To Build

Need meson and ninja. Alternatively, source an OpenBMC ARM/x86 SDK.

meson build && ninja -C build

To run unit tests

The simplest way of running the tests is as described by the meson man page:

meson builddir && meson test -C builddir

Alternatively, tests can be run in the OpenBMC CI docker container, or with an OpenBMC x86 sdk(see below for x86 steps).

meson -Doe-sdk=enabled build
ninja -C build test

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 meson option has to be created in pldm/meson_options.txt with its mapped compiler flag to enable conditional compilation.

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

The pldm/meson.build and the corresponding source file(s) will need to incorporate the logic of adding its mapped compiler flag to allow conditional compilation of the code.

pldmtool

For more information on pldmtool please refer to plmdtool/README.md.

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.

PDR Implementation

While PLDM Platform Descriptor Records (PDRs) are mostly static information, they can vary across platforms and systems. For this reason, platform specific PDR information is encoded in platform specific JSON files. JSON files must be named based on the PDR type number. For example a state effecter PDR JSON file will be named 11.json. The JSON files may also include information to enable additional processing (apart from PDR creation) for specific PDR types, for eg mapping an effecter id to a D-Bus object.

The PLDM responder implementation finds and parses PDR JSON files to create the PDR repository. Platform specific PDR modifications would likely just result in JSON updates. New PDR type support would require JSON updates as well as PDR generation code. The PDR generator is a map of PDR Type -> C++ lambda to create PDR entries for that type based on the JSON, and to update the central PDR repo.