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//
// Copyright 2017 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0
//
#ifndef INCLUDED_MPMD_XPORT_MGR_HPP
#define INCLUDED_MPMD_XPORT_MGR_HPP
#include "../device3/device3_impl.hpp"
#include <uhd/types/dict.hpp>
#include <memory>
#include <map>
#include <vector>
#include <string>
namespace uhd { namespace mpmd { namespace xport {
/*
* Transport specifiers
*/
//! Ethernet address for management and RPC communication
const std::string MGMT_ADDR_KEY = "mgmt_addr";
//! Primary Ethernet address for streaming and RFNoC communication
const std::string FIRST_ADDR_KEY = "addr";
//! Secondary Ethernet address for streaming and RFNoC communication
const std::string SECOND_ADDR_KEY = "second_addr";
/*! Return filtered subset from a device_addr_t
*
* The return dictionary will contain all key/value pairs from \p args
* where the key begins with \p prefix.
*
* \param args Bucket of key/value pairs
* \param prefix Key prefix to match against
*/
uhd::dict<std::string, std::string> filter_args(
const uhd::device_addr_t& args,
const std::string& prefix
);
/*! MPMD Transport Manager
*
* A transport manager is an object which sets up a physical connection to a
* CHDR device. Its implementation is specific to the underlying transport
* medium. For example, if the medium is Ethernet/UDP, this class will create
* sockets.
*/
class mpmd_xport_mgr
{
public:
using uptr = std::unique_ptr<mpmd_xport_mgr>;
using xport_info_t = std::map<std::string, std::string>;
using xport_info_list_t = std::vector<std::map<std::string, std::string>>;
/*! Return a reference to a transport manager
*
* \param mb_args Additional args from the motherboard. These may contain
* transport-related args (e.g., "recv_buff_size") which
* can be relevant to the underlying implementation.
*
* \returns Reference to manager object
* \throws uhd::key_error if \p xport_medium is not supported. The ctor of
* the underlying class that is requested can also throw.
*/
static uptr make(
const uhd::device_addr_t& mb_args
);
/*! Create a transports object
*
* Implementation details depend on the underlying implementation.
* In general, the implementations will follow the following recipe:
* 1. Pick a suitable element from \p xport_info_list
* 2. Do whatever system calls are necessary to create the physical
* transport; to do so, call the underlying implementation (UDP or
* whatever)
* 3. Update the selected element from xport_info_list
* 5. Return results
*
* \param xport_info_list List of possible options to choose from. Every
* element of this argument needs to have the same
* "type" key (e.g., they all need to be "UDP").
* \param xport_type Transport type (CTRL, RX_DATA, ...)
* \param xport_args Arbitrary additional transport args. These could come
* from the user, or other places.
* \param xport_info_out The updated dictionary from xport_info_list that
* was eventually chosen
*
* \returns The both_xports_t object containing the actual transport info,
* and xport_info_out contains the updated transport option info.
* The latter needs to get sent back to MPM to complete the
* transport handshake.
*/
virtual both_xports_t make_transport(
const xport_info_list_t &xport_info_list,
const usrp::device3_impl::xport_type_t xport_type,
const uhd::device_addr_t& xport_args,
xport_info_t& xport_info_out
) = 0;
/*! Return the path MTU for whatever this manager lets us do
*/
virtual size_t get_mtu(
const uhd::direction_t dir
) const = 0;
};
}}} /* namespace uhd::mpmd::xport */
#endif /* INCLUDED_MPMD_XPORT_MGR_HPP */
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