blob: 2af4ade4c0b980be42571f4a5f6d6696733dc8ec [file] [log] [blame]
#pragma once
#include "config.h"
#include "libpldm/base.h"
#include "libpldm/requester/pldm.h"
#include "common/types.hpp"
#include "pldmd/dbus_impl_requester.hpp"
#include "request.hpp"
#include <function2/function2.hpp>
#include <sdbusplus/timer.hpp>
#include <sdeventplus/event.hpp>
#include <sdeventplus/source/event.hpp>
#include <cassert>
#include <chrono>
#include <memory>
#include <tuple>
#include <unordered_map>
namespace pldm
{
namespace requester
{
/** @struct RequestKey
*
* RequestKey uniquely identifies the PLDM request message to match it with the
* response and a combination of MCTP endpoint ID, PLDM instance ID, PLDM type
* and PLDM command is the key.
*/
struct RequestKey
{
mctp_eid_t eid; //!< MCTP endpoint ID
uint8_t instanceId; //!< PLDM instance ID
uint8_t type; //!< PLDM type
uint8_t command; //!< PLDM command
bool operator==(const RequestKey& e) const
{
return ((eid == e.eid) && (instanceId == e.instanceId) &&
(type == e.type) && (command == e.command));
}
};
/** @struct RequestKeyHasher
*
* This is a simple hash function, since the instance ID generator API
* generates unique instance IDs for MCTP endpoint ID.
*/
struct RequestKeyHasher
{
std::size_t operator()(const RequestKey& key) const
{
return (key.eid << 24 | key.instanceId << 16 | key.type << 8 |
key.command);
}
};
using ResponseHandler = fu2::unique_function<void(
mctp_eid_t eid, const pldm_msg* response, size_t respMsgLen)>;
/** @class Handler
*
* This class handles the lifecycle of the PLDM request message based on the
* instance ID expiration interval, number of request retries and the timeout
* waiting for a response. The registered response handlers are invoked with
* response once the PLDM responder sends the response. If no response is
* received within the instance ID expiration interval or any other failure the
* response handler is invoked with the empty response.
*
* @tparam RequestInterface - Request class type
*/
template <class RequestInterface>
class Handler
{
public:
Handler() = delete;
Handler(const Handler&) = delete;
Handler(Handler&&) = delete;
Handler& operator=(const Handler&) = delete;
Handler& operator=(Handler&&) = delete;
~Handler() = default;
/** @brief Constructor
*
* @param[in] fd - fd of MCTP communications socket
* @param[in] event - reference to PLDM daemon's main event loop
* @param[in] requester - reference to Requester object
* @param[in] instanceIdExpiryInterval - instance ID expiration interval
* @param[in] numRetries - number of request retries
* @param[in] responseTimeOut - time to wait between each retry
*/
explicit Handler(
int fd, sdeventplus::Event& event, pldm::dbus_api::Requester& requester,
std::chrono::seconds instanceIdExpiryInterval =
std::chrono::seconds(INSTANCE_ID_EXPIRATION_INTERVAL),
uint8_t numRetries = static_cast<uint8_t>(NUMBER_OF_REQUEST_RETRIES),
std::chrono::milliseconds responseTimeOut =
std::chrono::milliseconds(RESPONSE_TIME_OUT)) :
fd(fd),
event(event), requester(requester),
instanceIdExpiryInterval(instanceIdExpiryInterval),
numRetries(numRetries), responseTimeOut(responseTimeOut)
{}
/** @brief Register a PLDM request message
*
* @param[in] eid - endpoint ID of the remote MCTP endpoint
* @param[in] instanceId - instance ID to match request and response
* @param[in] type - PLDM type
* @param[in] command - PLDM command
* @param[in] requestMsg - PLDM request message
* @param[in] responseHandler - Response handler for this request
*
* @return return PLDM_SUCCESS on success and PLDM_ERROR otherwise
*/
int registerRequest(mctp_eid_t eid, uint8_t instanceId, uint8_t type,
uint8_t command, pldm::Request&& requestMsg,
ResponseHandler&& responseHandler)
{
RequestKey key{eid, instanceId, type, command};
auto instanceIdExpiryCallBack = [key, this](void) {
if (this->handlers.contains(key))
{
std::cerr << "Response not received for the request, instance "
"ID expired."
<< " EID = " << (unsigned)key.eid
<< " INSTANCE_ID = " << (unsigned)key.instanceId
<< " TYPE = " << (unsigned)key.type
<< " COMMAND = " << (unsigned)key.command << "\n";
auto& [request, responseHandler, timerInstance] =
this->handlers[key];
request->stop();
auto rc = timerInstance->stop();
if (rc)
{
std::cerr
<< "Failed to stop the instance ID expiry timer. RC = "
<< rc << "\n";
}
// Call response handler with an empty response to indicate no
// response
responseHandler(key.eid, nullptr, 0);
this->removeRequestContainer.emplace(
key, std::make_unique<sdeventplus::source::Defer>(
event, std::bind(&Handler::removeRequestEntry,
this, key)));
}
else
{
// This condition is not possible, if a response is received
// before the instance ID expiry, then the response handler
// is executed and the entry will be removed.
assert(false);
}
};
auto request = std::make_unique<RequestInterface>(
fd, eid, event, std::move(requestMsg), numRetries, responseTimeOut);
auto timer = std::make_unique<phosphor::Timer>(
event.get(), instanceIdExpiryCallBack);
auto rc = request->start();
if (rc)
{
requester.markFree(eid, instanceId);
std::cerr << "Failure to send the PLDM request message"
<< "\n";
return rc;
}
try
{
timer->start(duration_cast<std::chrono::microseconds>(
instanceIdExpiryInterval));
}
catch (const std::runtime_error& e)
{
requester.markFree(eid, instanceId);
std::cerr << "Failed to start the instance ID expiry timer. RC = "
<< e.what() << "\n";
return PLDM_ERROR;
}
handlers.emplace(key, std::make_tuple(std::move(request),
std::move(responseHandler),
std::move(timer)));
return rc;
}
/** @brief Handle PLDM response message
*
* @param[in] eid - endpoint ID of the remote MCTP endpoint
* @param[in] instanceId - instance ID to match request and response
* @param[in] type - PLDM type
* @param[in] command - PLDM command
* @param[in] response - PLDM response message
* @param[in] respMsgLen - length of the response message
*/
void handleResponse(mctp_eid_t eid, uint8_t instanceId, uint8_t type,
uint8_t command, const pldm_msg* response,
size_t respMsgLen)
{
RequestKey key{eid, instanceId, type, command};
if (handlers.contains(key))
{
auto& [request, responseHandler, timerInstance] = handlers[key];
request->stop();
auto rc = timerInstance->stop();
if (rc)
{
std::cerr
<< "Failed to stop the instance ID expiry timer. RC = "
<< rc << "\n";
}
responseHandler(eid, response, respMsgLen);
requester.markFree(key.eid, key.instanceId);
handlers.erase(key);
}
else
{
// Got a response for a PLDM request message not registered with the
// request handler, so freeing up the instance ID, this can be other
// OpenBMC applications relying on PLDM D-Bus apis like
// openpower-occ-control and softoff
requester.markFree(key.eid, key.instanceId);
}
}
private:
int fd; //!< file descriptor of MCTP communications socket
sdeventplus::Event& event; //!< reference to PLDM daemon's main event loop
pldm::dbus_api::Requester& requester; //!< reference to Requester object
std::chrono::seconds
instanceIdExpiryInterval; //!< Instance ID expiration interval
uint8_t numRetries; //!< number of request retries
std::chrono::milliseconds
responseTimeOut; //!< time to wait between each retry
/** @brief Container for storing the details of the PLDM request message,
* handler for the corresponding PLDM response and the timer object
* for the Instance ID expiration
*/
using RequestValue =
std::tuple<std::unique_ptr<RequestInterface>, ResponseHandler,
std::unique_ptr<phosphor::Timer>>;
/** @brief Container for storing the PLDM request entries */
std::unordered_map<RequestKey, RequestValue, RequestKeyHasher> handlers;
/** @brief Container to store information about the request entries to be
* removed after the instance ID timer expires
*/
std::unordered_map<RequestKey, std::unique_ptr<sdeventplus::source::Defer>,
RequestKeyHasher>
removeRequestContainer;
/** @brief Remove request entry for which the instance ID expired
*
* @param[in] key - key for the Request
*/
void removeRequestEntry(RequestKey key)
{
if (removeRequestContainer.contains(key))
{
removeRequestContainer[key].reset();
requester.markFree(key.eid, key.instanceId);
handlers.erase(key);
removeRequestContainer.erase(key);
}
}
};
} // namespace requester
} // namespace pldm