rfnoc: Refactored CHDR packet interfaces

- Moved packet interface code from public to private include
- Split packet interface into two files: payload paring and packet iface
- Added support for all CHDR packet types
- Added more test cases to unit test

6 files changed, 1783 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/rfnoc/chdr/chdr_packet.hpp b/host/lib/include/uhdlib/rfnoc/chdr/chdr_packet.hpp
new file mode 100644
index 000000000..102a6e104
--- /dev/null
+++ b/host/lib/include/uhdlib/rfnoc/chdr/chdr_packet.hpp
@@ -0,0 +1,290 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#ifndef INCLUDED_RFNOC_CHDR_PACKET_HPP
+#define INCLUDED_RFNOC_CHDR_PACKET_HPP
+
+#include <uhd/types/endianness.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <uhdlib/rfnoc/chdr/chdr_types.hpp>
+#include <limits>
+
+namespace uhd { namespace rfnoc { namespace chdr {
+
+//----------------------------------------------------
+// Generic CHDR Packet Container
+//----------------------------------------------------
+
+//! A container class that wraps a generic buffer that contains a CHDR packet. The
+//  container provides a high level API to read and write the header, metadata and payload
+//  of the packet. The payload can be accessed as a generic buffer using this interface.
+//
+class chdr_packet
+{
+public:
+    //! A unique pointer to a const chdr_packet. Useful as a read-only interface.
+    typedef std::unique_ptr<const chdr_packet> cuptr;
+    //! A unique pointer to a non-const chdr_packet. Useful as a read-write interface.
+    typedef std::unique_ptr<chdr_packet> uptr;
+
+    virtual ~chdr_packet() = 0;
+
+    /*! Updates the underlying storage of this packet. This is a const method and is
+     *  only useful for read-only (RX) access.
+     *
+     * \param pkt_buff Pointer to a buffer that contains the RX packet
+     */
+    virtual void refresh(const void* pkt_buff) const = 0;
+
+    /*! Updates the underlying storage of this packet, and populates it with the specified
+     *  arguments. This is a non-const method and is useful for read-write (TX) access.
+     *
+     * \param pkt_buff Pointer to a buffer that should be populated with the TX packet
+     * \param header The CHDR header to fill into the TX packet
+     * \param timestamp The timestamp to fill into the TX packet (if requested)
+     */
+    virtual void refresh(void* pkt_buff, chdr_header& header, uint64_t timestamp = 0) = 0;
+
+    /*! Updates the CHDR header with the written payload size
+     *
+     * \param payload_size_bytes The payload size in bytes
+     */
+    virtual void update_payload_size(size_t payload_size_bytes) = 0;
+
+    /*! Returns a class that represents the contents of the CHDR header
+     *
+     * \return The CHDR header
+     */
+    virtual chdr_header get_chdr_header() const = 0;
+
+    /*! Returns the timestamp in the packet as an optional value
+     *
+     * \return A boost::optional which if initialized has the timestamp
+     */
+    virtual boost::optional<uint64_t> get_timestamp() const = 0;
+
+    /*! Returns the endianness of the metadata and payload buffers
+     *
+     * \return The byte order as a uhd::endianness_t
+     */
+    virtual endianness_t get_byte_order() const = 0;
+
+    /*! Returns the maximum transfer unit in bytes
+     *
+     * \return The maximum transfer unit in bytes
+     */
+    virtual size_t get_mtu_bytes() const = 0;
+
+    /*! Returns the metadata size in bytes
+     *
+     * \return The size in bytes
+     */
+    virtual size_t get_mdata_size() const = 0;
+
+    /*! Returns a const void pointer to the metadata section in the packet
+     *
+     * \return A pointer to the metadata
+     */
+    virtual const void* get_mdata_const_ptr() const = 0;
+
+    /*! Returns a non-const void pointer to the metadata section in the packet
+     *
+     * \return A pointer to the metadata
+     */
+    virtual void* get_mdata_ptr() = 0;
+
+    /*! Returns the payload size in bytes
+     *
+     * \return The size in bytes
+     */
+    virtual size_t get_payload_size() const = 0;
+
+    /*! Returns a const void pointer to the payload section in the packet
+     *
+     * \return A pointer to the payload
+     */
+    virtual const void* get_payload_const_ptr() const = 0;
+
+    /*! Returns a non-const void pointer to the payload section in the packet
+     *
+     * \return A pointer to the payload
+     */
+    virtual void* get_payload_ptr() = 0;
+
+    //! Shortcut to return the const metadata pointer cast as a specific type
+    template <typename data_t>
+    inline const data_t* get_mdata_const_ptr_as() const
+    {
+        return reinterpret_cast<const data_t*>(get_mdata_const_ptr());
+    }
+
+    //! Shortcut to return the non-const metadata pointer cast as a specific type
+    template <typename data_t>
+    inline data_t* get_mdata_ptr_as()
+    {
+        return reinterpret_cast<data_t*>(get_mdata_ptr());
+    }
+
+    //! Shortcut to return the const payload pointer cast as a specific type
+    template <typename data_t>
+    inline const data_t* get_payload_const_ptr_as() const
+    {
+        return reinterpret_cast<const data_t*>(get_payload_const_ptr());
+    }
+
+    //! Shortcut to return the non-const payload pointer cast as a specific type
+    template <typename data_t>
+    inline data_t* get_payload_ptr_as()
+    {
+        return reinterpret_cast<data_t*>(get_payload_ptr());
+    }
+
+    //! Return a function to convert a word of type data_t to host order
+    template <typename data_t>
+    const std::function<data_t(data_t)> conv_to_host() const
+    {
+        return (get_byte_order() == uhd::ENDIANNESS_BIG) ? uhd::ntohx<data_t>
+                                                         : uhd::wtohx<data_t>;
+    }
+
+    //! Return a function to convert a word of type data_t from host order
+    template <typename data_t>
+    const std::function<data_t(data_t)> conv_from_host() const
+    {
+        return (get_byte_order() == uhd::ENDIANNESS_BIG) ? uhd::htonx<data_t>
+                                                         : uhd::htowx<data_t>;
+    }
+};
+
+//----------------------------------------------------
+// Container for specific CHDR Packets
+//----------------------------------------------------
+
+//! A container class that wraps a generic buffer that contains a CHDR packet. The
+//  container provides a high level API to read and write the header, metadata and payload
+//  of the packet. The payload can be accessed as a specific type that will be serialized
+//  and deserialized appropriately.
+//
+template <typename payload_t>
+class chdr_packet_specific
+{
+public:
+    //! A unique pointer to a const chdr_packet. Useful as a read-only interface.
+    typedef std::unique_ptr<const chdr_packet_specific<payload_t>> cuptr;
+    //! A unique pointer to a non-const chdr_packet. Useful as a read-write interface.
+    typedef std::unique_ptr<chdr_packet_specific<payload_t>> uptr;
+
+    chdr_packet_specific(chdr_packet::uptr chdr_pkt) : _chdr_pkt(std::move(chdr_pkt)) {}
+    ~chdr_packet_specific() = default;
+
+    //! Updates the underlying storage of this packet. This is a const method and is
+    //  only useful for read-only access.
+    inline void refresh(const void* pkt_buff) const
+    {
+        _chdr_pkt->refresh(pkt_buff);
+    }
+
+    //! Updates the underlying storage of this packet, and populates it with the specified
+    //  arguments. This is a non-const method and is useful for read-write access.
+    inline void refresh(void* pkt_buff, chdr_header& header, const payload_t& payload)
+    {
+        payload.populate_header(header);
+        _chdr_pkt->refresh(pkt_buff, header);
+        size_t bytes_copied = payload.serialize(_chdr_pkt->get_payload_ptr_as<uint64_t>(),
+            _chdr_pkt->get_mtu_bytes(),
+            _chdr_pkt->conv_from_host<uint64_t>());
+        _chdr_pkt->update_payload_size(bytes_copied);
+        header = _chdr_pkt->get_chdr_header();
+    }
+
+    //! Returns a class that represents the contents of the CHDR header
+    inline chdr_header get_chdr_header() const
+    {
+        return std::move(_chdr_pkt->get_chdr_header());
+    }
+
+    //! Returns a class that represents the contents of the CHDR payload
+    inline payload_t get_payload() const
+    {
+        payload_t payload;
+        payload.deserialize(_chdr_pkt->get_payload_const_ptr_as<uint64_t>(),
+            _chdr_pkt->get_payload_size() / sizeof(uint64_t),
+            _chdr_pkt->conv_to_host<uint64_t>());
+        return std::move(payload);
+    }
+
+    //! Fills the CHDR payload into the specified parameter
+    inline void fill_payload(payload_t& payload) const
+    {
+        payload.deserialize(_chdr_pkt->get_payload_const_ptr_as<uint64_t>(),
+            _chdr_pkt->get_payload_size() / sizeof(uint64_t),
+            _chdr_pkt->conv_to_host<uint64_t>());
+    }
+
+private:
+    chdr_packet::uptr _chdr_pkt;
+};
+
+//----------------------------------------------------
+// Specific CHDR packet types
+//----------------------------------------------------
+
+//! CHDR control packet
+typedef chdr_packet_specific<ctrl_payload> chdr_ctrl_packet;
+
+//! CHDR stream status packet
+typedef chdr_packet_specific<strs_payload> chdr_strs_packet;
+
+//! CHDR stream command packet
+typedef chdr_packet_specific<strc_payload> chdr_strc_packet;
+
+//! CHDR management packet
+typedef chdr_packet_specific<mgmt_payload> chdr_mgmt_packet;
+
+//----------------------------------------------------
+// CHDR packet factory
+//----------------------------------------------------
+
+//! A copyable and movable factory class that is capable of generating generic and
+//! specific CHDR packet containers.
+//
+class chdr_packet_factory
+{
+public:
+    //! A parametrized ctor that takes in all the info required to generate a CHDR packet
+    chdr_packet_factory(chdr_w_t chdr_w, endianness_t endianness);
+    chdr_packet_factory()                               = delete;
+    chdr_packet_factory(const chdr_packet_factory& rhs) = default;
+    chdr_packet_factory(chdr_packet_factory&& rhs)      = default;
+
+    //! Makes a generic CHDR packet and transfers ownership to the client
+    chdr_packet::uptr make_generic(
+        size_t mtu_bytes = std::numeric_limits<size_t>::max()) const;
+
+    //! Makes a CHDR control packet and transfers ownership to the client
+    chdr_ctrl_packet::uptr make_ctrl(
+        size_t mtu_bytes = std::numeric_limits<size_t>::max()) const;
+
+    //! Makes a CHDR stream status packet and transfers ownership to the client
+    chdr_strs_packet::uptr make_strs(
+        size_t mtu_bytes = std::numeric_limits<size_t>::max()) const;
+
+    //! Makes a CHDR stream cmd packet and transfers ownership to the client
+    chdr_strc_packet::uptr make_strc(
+        size_t mtu_bytes = std::numeric_limits<size_t>::max()) const;
+
+    //! Makes a CHDR management packet and transfers ownership to the client
+    chdr_mgmt_packet::uptr make_mgmt(
+        size_t mtu_bytes = std::numeric_limits<size_t>::max()) const;
+
+private:
+    const chdr_w_t _chdr_w;
+    const endianness_t _endianness;
+};
+
+}}} // namespace uhd::rfnoc::chdr
+
+#endif /* INCLUDED_RFNOC_CHDR_PACKET_HPP */
diff --git a/host/lib/include/uhdlib/rfnoc/chdr/chdr_types.hpp b/host/lib/include/uhdlib/rfnoc/chdr/chdr_types.hpp
new file mode 100644
index 000000000..8363e1bcf
--- /dev/null
+++ b/host/lib/include/uhdlib/rfnoc/chdr/chdr_types.hpp
@@ -0,0 +1,837 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#ifndef INCLUDED_RFNOC_CHDR_TYPES_HPP
+#define INCLUDED_RFNOC_CHDR_TYPES_HPP
+
+#include <uhd/types/endianness.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <boost/optional.hpp>
+#include <list>
+#include <memory>
+#include <vector>
+
+namespace uhd { namespace rfnoc {
+
+enum chdr_w_t {
+    //! CHDR_W = 64 bits
+    CHDR_W_64 = 0,
+    //! CHDR_W = 128 bits
+    CHDR_W_128 = 1,
+    //! CHDR_W = 256 bits
+    CHDR_W_256 = 2,
+    //! CHDR_W = 512 bits
+    CHDR_W_512 = 3
+};
+
+using device_id_t = uint16_t;
+using sep_inst_t  = uint16_t;
+using sep_addr_t  = std::pair<device_id_t, sep_inst_t>;
+using sep_id_t    = uint16_t;
+
+constexpr size_t chdr_w_to_bits(chdr_w_t chdr_w)
+{
+    switch (chdr_w) {
+        case CHDR_W_64:
+            return 64;
+        case CHDR_W_128:
+            return 128;
+        case CHDR_W_256:
+            return 256;
+        case CHDR_W_512:
+            return 512;
+        default:
+            return 0;
+    }
+}
+
+namespace chdr {
+
+enum packet_type_t {
+    PKT_TYPE_MGMT         = 0x0, //! Management packet
+    PKT_TYPE_STRS         = 0x1, //! Stream status
+    PKT_TYPE_STRC         = 0x2, //! Stream Command
+    PKT_TYPE_CTRL         = 0x4, //! Control Transaction
+    PKT_TYPE_DATA_NO_TS   = 0x6, //! Data Packet without TimeStamp
+    PKT_TYPE_DATA_WITH_TS = 0x7, //! Data Packet with TimeStamp
+};
+
+//----------------------------------------------------
+// CHDR Header
+//----------------------------------------------------
+
+class chdr_header
+{
+public: // Functions
+    chdr_header()                       = default;
+    chdr_header(const chdr_header& rhs) = default;
+    chdr_header(chdr_header&& rhs)      = default;
+
+    //! Unpack the header from a uint64_t
+    chdr_header(uint64_t flat_hdr) : _flat_hdr(flat_hdr) {}
+
+    //! Get the virtual channel field (6 bits)
+    inline uint8_t get_vc() const
+    {
+        return get_field<uint8_t>(_flat_hdr, VC_OFFSET, VC_WIDTH);
+    }
+
+    //! Set the virtual channel field (6 bits)
+    inline void set_vc(uint8_t vc)
+    {
+        _flat_hdr = set_field(_flat_hdr, vc, VC_OFFSET, VC_WIDTH);
+    }
+
+    //! Get the end-of-burst flag (1 bit)
+    inline bool get_eob() const
+    {
+        return get_field<bool>(_flat_hdr, EOB_OFFSET, EOB_WIDTH);
+    }
+
+    //! Set the end-of-burst flag (1 bit)
+    inline void set_eob(bool eob)
+    {
+        _flat_hdr = set_field(_flat_hdr, eob, EOB_OFFSET, EOB_WIDTH);
+    }
+
+    //! Get the end-of-vector flag (1 bit)
+    inline bool get_eov() const
+    {
+        return get_field<bool>(_flat_hdr, EOV_OFFSET, EOV_WIDTH);
+    }
+
+    //! Set the end-of-vector flag (1 bit)
+    inline void set_eov(bool eov)
+    {
+        _flat_hdr = set_field(_flat_hdr, eov, EOV_OFFSET, EOV_WIDTH);
+    }
+
+    //! Get the packet type field (3 bits)
+    inline packet_type_t get_pkt_type() const
+    {
+        return get_field<packet_type_t>(_flat_hdr, PKT_TYPE_OFFSET, PKT_TYPE_WIDTH);
+    }
+
+    //! Set the packet type field (3 bits)
+    inline void set_pkt_type(packet_type_t pkt_type)
+    {
+        _flat_hdr = set_field(_flat_hdr, pkt_type, PKT_TYPE_OFFSET, PKT_TYPE_WIDTH);
+    }
+
+    //! Get number of metadata words field (5 bits)
+    inline uint8_t get_num_mdata() const
+    {
+        return get_field<uint8_t>(_flat_hdr, NUM_MDATA_OFFSET, NUM_MDATA_WIDTH);
+    }
+
+    //! Set number of metadata words field (5 bits)
+    inline void set_num_mdata(uint8_t num_mdata)
+    {
+        _flat_hdr = set_field(_flat_hdr, num_mdata, NUM_MDATA_OFFSET, NUM_MDATA_WIDTH);
+    }
+
+    //! Get the sequence number field (16 bits)
+    inline uint16_t get_seq_num() const
+    {
+        return get_field<uint16_t>(_flat_hdr, SEQ_NUM_OFFSET, SEQ_NUM_WIDTH);
+    }
+
+    //! Set the sequence number field (16 bits)
+    inline void set_seq_num(uint16_t seq_num)
+    {
+        _flat_hdr = set_field(_flat_hdr, seq_num, SEQ_NUM_OFFSET, SEQ_NUM_WIDTH);
+    }
+
+    //! Get the packet length field (16 bits)
+    inline uint16_t get_length() const
+    {
+        return get_field<uint16_t>(_flat_hdr, LENGTH_OFFSET, LENGTH_WIDTH);
+    }
+
+    //! Set the packet length field (16 bits)
+    inline void set_length(uint16_t length)
+    {
+        _flat_hdr = set_field(_flat_hdr, length, LENGTH_OFFSET, LENGTH_WIDTH);
+    }
+
+    //! Get the destination EPID field (16 bits)
+    inline uint16_t get_dst_epid() const
+    {
+        return get_field<uint16_t>(_flat_hdr, DST_EPID_OFFSET, DST_EPID_WIDTH);
+    }
+
+    //! Set the destination EPID field (16 bits)
+    inline void set_dst_epid(uint16_t dst_epid)
+    {
+        _flat_hdr = set_field(_flat_hdr, dst_epid, DST_EPID_OFFSET, DST_EPID_WIDTH);
+    }
+
+    //! Pack the header into a uint64_t
+    inline uint64_t pack() const
+    {
+        return _flat_hdr;
+    }
+
+    //! Pack the header into a uint64_t as an implicit cast
+    inline operator uint64_t() const
+    {
+        return pack();
+    }
+
+    //! Comparison operator (==)
+    inline bool operator==(const chdr_header& rhs) const
+    {
+        return _flat_hdr == rhs._flat_hdr;
+    }
+
+    //! Comparison operator (!=)
+    inline bool operator!=(const chdr_header& rhs) const
+    {
+        return _flat_hdr != rhs._flat_hdr;
+    }
+
+    //! Assignment operator (=) from a chdr_header
+    inline const chdr_header& operator=(const chdr_header& rhs)
+    {
+        _flat_hdr = rhs._flat_hdr;
+        return *this;
+    }
+
+    //! Assignment operator (=) from a uint64_t
+    inline const chdr_header& operator=(const uint64_t& rhs)
+    {
+        _flat_hdr = rhs;
+        return *this;
+    }
+
+private:
+    // The flattened representation of the header stored in host order
+    uint64_t _flat_hdr = 0;
+
+    static constexpr size_t VC_WIDTH        = 6;
+    static constexpr size_t EOB_WIDTH       = 1;
+    static constexpr size_t EOV_WIDTH       = 1;
+    static constexpr size_t PKT_TYPE_WIDTH  = 3;
+    static constexpr size_t NUM_MDATA_WIDTH = 5;
+    static constexpr size_t SEQ_NUM_WIDTH   = 16;
+    static constexpr size_t LENGTH_WIDTH    = 16;
+    static constexpr size_t DST_EPID_WIDTH  = 16;
+
+    static constexpr size_t VC_OFFSET        = 58;
+    static constexpr size_t EOB_OFFSET       = 57;
+    static constexpr size_t EOV_OFFSET       = 56;
+    static constexpr size_t PKT_TYPE_OFFSET  = 53;
+    static constexpr size_t NUM_MDATA_OFFSET = 48;
+    static constexpr size_t SEQ_NUM_OFFSET   = 32;
+    static constexpr size_t LENGTH_OFFSET    = 16;
+    static constexpr size_t DST_EPID_OFFSET  = 0;
+
+    static inline constexpr uint64_t mask(size_t width)
+    {
+        return ((uint64_t(1) << width) - 1);
+    }
+
+    template <typename field_t>
+    static inline constexpr field_t get_field(
+        uint64_t flat_hdr, size_t offset, size_t width)
+    {
+        return static_cast<field_t>((flat_hdr >> offset) & mask(width));
+    }
+
+    template <typename field_t>
+    static inline constexpr uint64_t set_field(
+        const uint64_t old_val, field_t field, size_t offset, size_t width)
+    {
+        return (old_val & ~(mask(width) << offset))
+               | ((static_cast<uint64_t>(field) & mask(width)) << offset);
+    }
+};
+
+
+//----------------------------------------------------
+// CHDR Control Packet Payload
+//----------------------------------------------------
+
+enum ctrl_status_t {
+    CMD_OKAY    = 0x0, //! Transaction successful
+    CMD_CMDERR  = 0x1, //! Slave asserted a command error
+    CMD_TSERR   = 0x2, //! Slave asserted a time stamp error
+    CMD_WARNING = 0x3, //! Slave asserted non-critical error
+};
+
+enum ctrl_opcode_t {
+    OP_SLEEP       = 0x0,
+    OP_WRITE       = 0x1,
+    OP_READ        = 0x2,
+    OP_READ_WRITE  = 0x3,
+    OP_BLOCK_WRITE = 0x4,
+    OP_BLOCK_READ  = 0x5,
+    OP_POLL        = 0x6,
+    OP_USER1       = 0xA,
+    OP_USER2       = 0xB,
+    OP_USER3       = 0xC,
+    OP_USER4       = 0xD,
+    OP_USER5       = 0xE,
+    OP_USER6       = 0xF,
+};
+
+class ctrl_payload
+{
+public: // Members
+    //! Destination port for transaction (10 bits)
+    uint16_t dst_port = 0;
+    //! Source port for transaction (10 bits)
+    uint16_t src_port = 0;
+    //! Sequence number (6 bits)
+    uint8_t seq_num = 0;
+    //! Has Time Flag (1 bit) and timestamp (64 bits)
+    boost::optional<uint64_t> timestamp = boost::none;
+    //! Is Acknowledgment Flag (1 bit)
+    bool is_ack = false;
+    //! Source endpoint ID of transaction (16 bits)
+    uint16_t src_epid = 0;
+    //! Address for transaction (20 bits)
+    uint32_t address = 0;
+    //! Data for transaction (vector of 32 bits)
+    std::vector<uint32_t> data_vtr = {0};
+    //! Byte-enable mask for transaction (4 bits)
+    uint8_t byte_enable = 0xF;
+    //! Operation code (4 bits)
+    ctrl_opcode_t op_code = OP_SLEEP;
+    //! Transaction status (4 bits)
+    ctrl_status_t status = CMD_OKAY;
+
+public: // Functions
+    ctrl_payload()                        = default;
+    ctrl_payload(const ctrl_payload& rhs) = default;
+    ctrl_payload(ctrl_payload&& rhs)      = default;
+
+    //! Populate the header for this type of packet
+    void populate_header(chdr_header& header) const;
+
+    //! Serialize the payload to a uint64_t buffer
+    size_t serialize(uint64_t* buff,
+        size_t max_size_bytes,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order) const;
+
+    //! Serialize the payload to a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    size_t serialize(uint64_t* buff, size_t max_size_bytes) const
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::htonx<uint64_t>(x)
+                                                       : uhd::htowx<uint64_t>(x);
+        };
+        return serialize(buff, max_size_bytes, conv_byte_order);
+    }
+
+    //! Deserialize the payload from a uint64_t buffer
+    void deserialize(const uint64_t* buff,
+        size_t num_elems,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order);
+
+    //! Deserialize the payload from a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    void deserialize(const uint64_t* buff, size_t num_elems)
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::ntohx<uint64_t>(x)
+                                                       : uhd::wtohx<uint64_t>(x);
+        };
+        deserialize(buff, num_elems, conv_byte_order);
+    }
+
+    //! Comparison operator (==)
+    bool operator==(const ctrl_payload& rhs) const;
+
+    //! Comparison operator (!=)
+    inline bool operator!=(const ctrl_payload& rhs) const
+    {
+        return !(*this == rhs);
+    }
+
+    //! Return a string representation of this object
+    const std::string to_string() const;
+
+private:
+    static constexpr size_t DST_PORT_WIDTH    = 10;
+    static constexpr size_t SRC_PORT_WIDTH    = 10;
+    static constexpr size_t NUM_DATA_WIDTH    = 4;
+    static constexpr size_t SEQ_NUM_WIDTH     = 6;
+    static constexpr size_t HAS_TIME_WIDTH    = 1;
+    static constexpr size_t IS_ACK_WIDTH      = 1;
+    static constexpr size_t SRC_EPID_WIDTH    = 16;
+    static constexpr size_t ADDRESS_WIDTH     = 20;
+    static constexpr size_t BYTE_ENABLE_WIDTH = 4;
+    static constexpr size_t OPCODE_WIDTH      = 4;
+    static constexpr size_t STATUS_WIDTH      = 2;
+
+    // Offsets assume 64-bit alignment
+    static constexpr size_t DST_PORT_OFFSET    = 0;
+    static constexpr size_t SRC_PORT_OFFSET    = 10;
+    static constexpr size_t NUM_DATA_OFFSET    = 20;
+    static constexpr size_t SEQ_NUM_OFFSET     = 24;
+    static constexpr size_t HAS_TIME_OFFSET    = 30;
+    static constexpr size_t IS_ACK_OFFSET      = 31;
+    static constexpr size_t SRC_EPID_OFFSET    = 32;
+    static constexpr size_t ADDRESS_OFFSET     = 0;
+    static constexpr size_t BYTE_ENABLE_OFFSET = 20;
+    static constexpr size_t OPCODE_OFFSET      = 24;
+    static constexpr size_t STATUS_OFFSET      = 30;
+    static constexpr size_t LO_DATA_OFFSET     = 0;
+    static constexpr size_t HI_DATA_OFFSET     = 32;
+};
+
+//----------------------------------------------------
+// CHDR Stream Status Packet Payload
+//----------------------------------------------------
+
+enum strs_status_t {
+    STRS_OKAY    = 0x0, //! No error
+    STRS_CMDERR  = 0x1, //! A stream command signalled an error
+    STRS_SEQERR  = 0x2, //! Packet out of sequence (sequence error)
+    STRS_DATAERR = 0x3, //! Data integrity check failed
+    STRS_RTERR   = 0x4, //! Unexpected destination (routing error)
+};
+
+class strs_payload
+{
+public: // Members
+    //! The source EPID for the stream (16 bits)
+    uint16_t src_epid = 0;
+    //! The status of the stream (4 bits)
+    strs_status_t status = STRS_OKAY;
+    //! Buffer capacity in bytes (40 bits)
+    uint64_t capacity_bytes = 0;
+    //! Buffer capacity in packets (24 bits)
+    uint32_t capacity_pkts = 0;
+    //! Transfer count in bytes (64 bits)
+    uint64_t xfer_count_bytes = 0;
+    //! Transfer count in packets (40 bits)
+    uint64_t xfer_count_pkts = 0;
+    //! Buffer info (16 bits)
+    uint16_t buff_info = 0;
+    //! Extended status info (48 bits)
+    uint64_t status_info = 0;
+
+public: // Functions
+    strs_payload()                        = default;
+    strs_payload(const strs_payload& rhs) = default;
+    strs_payload(strs_payload&& rhs)      = default;
+
+    //! Populate the header for this type of packet
+    void populate_header(chdr_header& header) const;
+
+    //! Serialize the payload to a uint64_t buffer
+    size_t serialize(uint64_t* buff,
+        size_t max_size_bytes,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order) const;
+
+    //! Serialize the payload to a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    size_t serialize(uint64_t* buff, size_t max_size_bytes) const
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::htonx<uint64_t>(x)
+                                                       : uhd::htowx<uint64_t>(x);
+        };
+        return serialize(buff, max_size_bytes, conv_byte_order);
+    }
+
+    //! Deserialize the payload from a uint64_t buffer
+    void deserialize(const uint64_t* buff,
+        size_t num_elems,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order);
+
+    //! Deserialize the payload from a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    void deserialize(const uint64_t* buff, size_t num_elems)
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::ntohx<uint64_t>(x)
+                                                       : uhd::wtohx<uint64_t>(x);
+        };
+        deserialize(buff, num_elems, conv_byte_order);
+    }
+
+    //! Comparison operator (==)
+    bool operator==(const strs_payload& rhs) const;
+
+    //! Comparison operator (!=)
+    inline bool operator!=(const strs_payload& rhs) const
+    {
+        return !(*this == rhs);
+    }
+
+    //! Return a string representation of this object
+    const std::string to_string() const;
+
+private:
+    static constexpr size_t SRC_EPID_WIDTH        = 16;
+    static constexpr size_t STATUS_WIDTH          = 4;
+    static constexpr size_t CAPACITY_BYTES_WIDTH  = 40;
+    static constexpr size_t CAPACITY_PKTS_WIDTH   = 24;
+    static constexpr size_t XFER_COUNT_PKTS_WIDTH = 40;
+    static constexpr size_t BUFF_INFO_WIDTH       = 16;
+    static constexpr size_t STATUS_INFO_WIDTH     = 48;
+
+    // Offsets assume 64-bit alignment
+    static constexpr size_t SRC_EPID_OFFSET        = 0;
+    static constexpr size_t STATUS_OFFSET          = 16;
+    static constexpr size_t CAPACITY_BYTES_OFFSET  = 24;
+    static constexpr size_t CAPACITY_PKTS_OFFSET   = 0;
+    static constexpr size_t XFER_COUNT_PKTS_OFFSET = 24;
+    static constexpr size_t BUFF_INFO_OFFSET       = 0;
+    static constexpr size_t STATUS_INFO_OFFSET     = 16;
+};
+
+//----------------------------------------------------
+// CHDR Stream Command Packet Payload
+//----------------------------------------------------
+
+enum strc_op_code_t {
+    STRC_INIT   = 0x0, //! Initialize stream
+    STRC_PING   = 0x1, //! Trigger a stream status response
+    STRC_RESYNC = 0x2, //! Re-synchronize flow control
+};
+
+class strc_payload
+{
+public: // Members
+    //! The source EPID for the stream (16 bits)
+    uint16_t src_epid = 0;
+    //! Operation code for the command (4 bits)
+    strc_op_code_t op_code = STRC_INIT;
+    //! Data associated with the operation (4 bits)
+    uint8_t op_data = 0;
+    //! Number of packets to use for operation (40 bits)
+    uint64_t num_pkts = 0;
+    //! Number of bytes to use for operation (64 bits)
+    uint64_t num_bytes = 0;
+
+public: // Functions
+    strc_payload()                        = default;
+    strc_payload(const strc_payload& rhs) = default;
+    strc_payload(strc_payload&& rhs)      = default;
+
+    //! Populate the header for this type of packet
+    void populate_header(chdr_header& header) const;
+
+    //! Serialize the payload to a uint64_t buffer
+    size_t serialize(uint64_t* buff,
+        size_t max_size_bytes,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order) const;
+
+    //! Serialize the payload to a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    size_t serialize(uint64_t* buff, size_t max_size_bytes) const
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::htonx<uint64_t>(x)
+                                                       : uhd::htowx<uint64_t>(x);
+        };
+        return serialize(buff, max_size_bytes, conv_byte_order);
+    }
+
+    //! Deserialize the payload from a uint64_t buffer
+    void deserialize(const uint64_t* buff,
+        size_t num_elems,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order);
+
+    //! Deserialize the payload from a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    void deserialize(const uint64_t* buff, size_t num_elems)
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::ntohx<uint64_t>(x)
+                                                       : uhd::wtohx<uint64_t>(x);
+        };
+        deserialize(buff, num_elems, conv_byte_order);
+    }
+
+    //! Comparison operator (==)
+    bool operator==(const strc_payload& rhs) const;
+
+    //! Comparison operator (!=)
+    inline bool operator!=(const strc_payload& rhs) const
+    {
+        return !(*this == rhs);
+    }
+
+    //! Return a string representation of this object
+    const std::string to_string() const;
+
+private:
+    static constexpr size_t SRC_EPID_WIDTH = 16;
+    static constexpr size_t OP_CODE_WIDTH  = 4;
+    static constexpr size_t OP_DATA_WIDTH  = 4;
+    static constexpr size_t NUM_PKTS_WIDTH = 40;
+
+    // Offsets assume 64-bit alignment
+    static constexpr size_t SRC_EPID_OFFSET = 0;
+    static constexpr size_t OP_CODE_OFFSET  = 16;
+    static constexpr size_t OP_DATA_OFFSET  = 20;
+    static constexpr size_t NUM_PKTS_OFFSET = 24;
+};
+
+//----------------------------------------------------
+// CHDR Management Packet Payload
+//----------------------------------------------------
+
+//! A class that represents a single management operation
+//  An operation consists of an operation code and some
+//  payload associated with that operation.
+class mgmt_op_t
+{
+public:
+    // Operation code
+    enum op_code_t {
+        //! Do nothing
+        MGMT_OP_NOP = 0,
+        //! Advertise this operation to the outside logic
+        MGMT_OP_ADVERTISE = 1,
+        //! Select the next destination for routing
+        MGMT_OP_SEL_DEST = 2,
+        //! Return the management packet back to its source
+        MGMT_OP_RETURN = 3,
+        //! Request information about the current node
+        MGMT_OP_INFO_REQ = 4,
+        //! A response to an information request
+        MGMT_OP_INFO_RESP = 5,
+        //! Perform a configuration write on the node
+        MGMT_OP_CFG_WR_REQ = 6,
+        //! Perform a configuration read on the node
+        MGMT_OP_CFG_RD_REQ = 7,
+        //! A response to a configuration read
+        MGMT_OP_CFG_RD_RESP = 8
+    };
+
+    //! The payload for an operation is 48 bits wide.
+    using payload_t = uint64_t;
+
+    //! An interpretation class for the payload for MGMT_OP_SEL_DEST
+    struct sel_dest_payload
+    {
+        const uint16_t dest;
+
+        sel_dest_payload(uint16_t dest_) : dest(dest_) {}
+        sel_dest_payload(payload_t payload_) : dest(static_cast<uint16_t>(payload_)) {}
+        operator payload_t() const
+        {
+            return static_cast<payload_t>(dest);
+        }
+    };
+
+    //! An interpretation class for the payload for MGMT_OP_CFG_WR_REQ,
+    //! MGMT_OP_CFG_RD_REQ and MGMT_OP_CFG_RD_RESP
+    struct cfg_payload
+    {
+        const uint16_t addr;
+        const uint32_t data;
+
+        cfg_payload(uint16_t addr_, uint32_t data_ = 0) : addr(addr_), data(data_) {}
+        cfg_payload(payload_t payload_)
+            : addr(static_cast<uint16_t>(payload_ >> 0))
+            , data(static_cast<uint32_t>(payload_ >> 16))
+        {
+        }
+        operator payload_t() const
+        {
+            return ((static_cast<payload_t>(data) << 16) | static_cast<payload_t>(addr));
+        }
+    };
+
+    //! An interpretation class for the payload for MGMT_OP_INFO_RESP
+    struct node_info_payload
+    {
+        const uint16_t device_id;
+        const uint8_t node_type;
+        const uint16_t node_inst;
+        const uint32_t ext_info;
+
+        node_info_payload(uint16_t device_id_,
+            uint8_t node_type_,
+            uint16_t node_inst_,
+            uint32_t ext_info_)
+            : device_id(device_id_)
+            , node_type(node_type_)
+            , node_inst(node_inst_)
+            , ext_info(ext_info_)
+        {
+        }
+        node_info_payload(payload_t payload_)
+            : device_id(static_cast<uint16_t>(payload_ >> 0))
+            , node_type(static_cast<uint8_t>((payload_ >> 16) & 0xF))
+            , node_inst(static_cast<uint16_t>((payload_ >> 20) & 0x3FF))
+            , ext_info(static_cast<uint32_t>((payload_ >> 30) & 0x3FFFF))
+        {
+        }
+        operator payload_t() const
+        {
+            return ((static_cast<payload_t>(device_id) << 0)
+                    | (static_cast<payload_t>(node_type & 0xF) << 16)
+                    | (static_cast<payload_t>(node_inst & 0x3FF) << 20)
+                    | (static_cast<payload_t>(ext_info & 0x3FFFF) << 30));
+        }
+    };
+
+    mgmt_op_t(const op_code_t op_code, const payload_t op_payload = 0)
+        : _op_code(op_code), _op_payload(op_payload)
+    {
+    }
+    mgmt_op_t(const mgmt_op_t& rhs) = default;
+
+    //! Get the op-code for this transaction
+    inline op_code_t get_op_code() const
+    {
+        return _op_code;
+    }
+
+    //! Get the payload for this transaction
+    inline uint64_t get_op_payload() const
+    {
+        return _op_payload;
+    }
+
+private:
+    const op_code_t _op_code;
+    const payload_t _op_payload;
+};
+
+//! A class that represents a single management hop
+//  A hop is a collection for management transactions for
+//  a single node.
+class mgmt_hop_t
+{
+public:
+    mgmt_hop_t()                      = default;
+    mgmt_hop_t(const mgmt_hop_t& rhs) = default;
+
+    //! Add a management operation to this hop.
+    //  Operations are added to the hop in FIFO order and executed in FIFO order.
+    inline void add_op(const mgmt_op_t& op)
+    {
+        _ops.push_back(op);
+    }
+
+    //! Get the number of management operations in this hop
+    inline size_t get_num_ops() const
+    {
+        return _ops.size();
+    }
+
+    //! Get the n'th operation in the hop
+    inline const mgmt_op_t& get_op(size_t i) const
+    {
+        return _ops.at(i);
+    }
+
+    //! Serialize the payload to a uint64_t buffer
+    size_t serialize(std::vector<uint64_t>& target,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order) const;
+
+    //! Deserialize the payload from a uint64_t buffer
+    void deserialize(std::list<uint64_t>& src,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order);
+
+private:
+    std::vector<mgmt_op_t> _ops;
+};
+
+//! A class that represents a complete multi-hop management transaction
+//  A transaction is a collection of hops, where each hop is a collection
+//  of management transactions.
+class mgmt_payload
+{
+public:
+    mgmt_payload()                        = default;
+    mgmt_payload(const mgmt_payload& rhs) = default;
+    mgmt_payload(mgmt_payload&& rhs)      = default;
+
+    inline void set_header(sep_id_t src_epid, uint16_t protover, chdr_w_t chdr_w)
+    {
+        _src_epid = src_epid;
+        _chdr_w   = chdr_w;
+        _protover = protover;
+    }
+
+    //! Add a management hop to this transaction
+    //  Hops are added to the hop in FIFO order and executed in FIFO order.
+    inline void add_hop(const mgmt_hop_t& hop)
+    {
+        _hops.push_back(hop);
+    }
+
+    //! Get the number of management hops in this hop
+    inline size_t get_num_hops() const
+    {
+        return _hops.size();
+    }
+
+    //! Get the n'th hop in the transaction
+    inline const mgmt_hop_t& get_hop(size_t i) const
+    {
+        return _hops.at(i);
+    }
+
+    inline size_t get_size_bytes() const
+    {
+        size_t num_lines = 1; /* header */
+        for (const auto& hop : _hops) {
+            num_lines += hop.get_num_ops();
+        }
+        return num_lines * (chdr_w_to_bits(_chdr_w) / 8);
+    }
+
+    //! Populate the header for this type of packet
+    void populate_header(chdr_header& header) const;
+
+    //! Serialize the payload to a uint64_t buffer
+    size_t serialize(uint64_t* buff,
+        size_t max_size_bytes,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order) const;
+
+    //! Serialize the payload to a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    size_t serialize(uint64_t* buff, size_t max_size_bytes) const
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::htonx<uint64_t>(x)
+                                                       : uhd::htowx<uint64_t>(x);
+        };
+        return serialize(buff, max_size_bytes, conv_byte_order);
+    }
+
+    //! Deserialize the payload from a uint64_t buffer
+    void deserialize(const uint64_t* buff,
+        size_t num_elems,
+        const std::function<uint64_t(uint64_t)>& conv_byte_order);
+
+    //! Deserialize the payload from a uint64_t buffer (no conversion function)
+    template <endianness_t endianness>
+    void deserialize(const uint64_t* buff, size_t num_elems)
+    {
+        auto conv_byte_order = [](uint64_t x) -> uint64_t {
+            return (endianness == uhd::ENDIANNESS_BIG) ? uhd::ntohx<uint64_t>(x)
+                                                       : uhd::wtohx<uint64_t>(x);
+        };
+        deserialize(buff, num_elems, conv_byte_order);
+    }
+
+    //! Return a string representation of this object
+    const std::string to_string() const;
+
+private:
+    sep_id_t _src_epid = 0;
+    uint16_t _protover = 0;
+    chdr_w_t _chdr_w   = CHDR_W_64;
+    std::vector<mgmt_hop_t> _hops;
+};
+
+} // namespace chdr
+}} // namespace uhd::rfnoc
+
+#endif /* INCLUDED_RFNOC_CHDR_TYPES_HPP */
diff --git a/host/lib/rfnoc/CMakeLists.txt b/host/lib/rfnoc/CMakeLists.txt
index 9b14f3456..fe8e8a564 100644
--- a/host/lib/rfnoc/CMakeLists.txt
+++ b/host/lib/rfnoc/CMakeLists.txt
@@ -32,6 +32,7 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/sink_node_ctrl.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/source_block_ctrl_base.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/source_node_ctrl.cpp
+#    ${CMAKE_CURRENT_SOURCE_DIR}/mgmt_portal.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/stream_sig.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/tick_node_ctrl.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/tx_stream_terminator.cpp
@@ -48,4 +49,5 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/replay_block_ctrl_impl.cpp
 )
 
+INCLUDE_SUBDIRECTORY(chdr)
 INCLUDE_SUBDIRECTORY(nocscript)
diff --git a/host/lib/rfnoc/chdr/CMakeLists.txt b/host/lib/rfnoc/chdr/CMakeLists.txt
new file mode 100644
index 000000000..fca46fe4a
--- /dev/null
+++ b/host/lib/rfnoc/chdr/CMakeLists.txt
@@ -0,0 +1,15 @@
+#
+# Copyright 2014-2015,2017 Ettus Research LLC
+# Copyright 2018 Ettus Research, a National Instruments Company
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+########################################################################
+# This file included, use CMake directory variables
+########################################################################
+
+LIBUHD_APPEND_SOURCES(
+    ${CMAKE_CURRENT_SOURCE_DIR}/chdr_types.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/chdr_packet.cpp
+)
diff --git a/host/lib/rfnoc/chdr/chdr_packet.cpp b/host/lib/rfnoc/chdr/chdr_packet.cpp
new file mode 100644
index 000000000..b058115ab
--- /dev/null
+++ b/host/lib/rfnoc/chdr/chdr_packet.cpp
@@ -0,0 +1,213 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhdlib/rfnoc/chdr/chdr_packet.hpp>
+#include <cassert>
+#include <functional>
+#include <memory>
+
+using namespace uhd;
+using namespace uhd::rfnoc::chdr;
+
+chdr_packet::~chdr_packet() = default;
+
+//------------------------------------------------------------
+// chdr_packet
+//------------------------------------------------------------
+
+template <size_t chdr_w, endianness_t endianness>
+class chdr_packet_impl : public chdr_packet
+{
+public:
+    chdr_packet_impl() = delete;
+    chdr_packet_impl(size_t mtu_bytes) : _mtu_bytes(mtu_bytes) {}
+    ~chdr_packet_impl() = default;
+
+    virtual void refresh(const void* pkt_buff) const
+    {
+        assert(pkt_buff);
+        _pkt_buff = const_cast<uint64_t*>(reinterpret_cast<const uint64_t*>(pkt_buff));
+        _compute_mdata_offset();
+    }
+
+    virtual void refresh(void* pkt_buff, chdr_header& header, uint64_t timestamp = 0)
+    {
+        assert(pkt_buff);
+        _pkt_buff    = reinterpret_cast<uint64_t*>(pkt_buff);
+        _pkt_buff[0] = u64_from_host(header);
+        if (_has_timestamp(header)) {
+            _pkt_buff[1] = timestamp;
+        }
+        _compute_mdata_offset();
+    }
+
+    virtual void update_payload_size(size_t payload_size_bytes)
+    {
+        chdr_header header = get_chdr_header();
+        header.set_length(((_mdata_offset + header.get_num_mdata()) * chdr_w_bytes)
+                          + payload_size_bytes);
+        _pkt_buff[0] = u64_from_host(header);
+    }
+
+    virtual endianness_t get_byte_order() const
+    {
+        return endianness;
+    }
+
+    virtual size_t get_mtu_bytes() const
+    {
+        return _mtu_bytes;
+    }
+
+    virtual chdr_header get_chdr_header() const
+    {
+        assert(_pkt_buff);
+        return std::move(chdr_header(u64_to_host(_pkt_buff[0])));
+    }
+
+    virtual boost::optional<uint64_t> get_timestamp() const
+    {
+        if (_has_timestamp(get_chdr_header())) {
+            // In a unit64_t buffer, the timestamp is always immediately after the header
+            // regardless of chdr_w.
+            return u64_to_host(_pkt_buff[1]);
+        } else {
+            return boost::none;
+        }
+    }
+
+    virtual size_t get_mdata_size() const
+    {
+        return get_chdr_header().get_num_mdata() * chdr_w_bytes;
+    }
+
+    virtual const void* get_mdata_const_ptr() const
+    {
+        return const_cast<void*>(
+            const_cast<chdr_packet_impl<chdr_w, endianness>*>(this)->get_mdata_ptr());
+    }
+
+    virtual void* get_mdata_ptr()
+    {
+        return reinterpret_cast<void*>(_pkt_buff + (chdr_w_stride * _mdata_offset));
+    }
+
+    virtual size_t get_payload_size() const
+    {
+        return get_chdr_header().get_length() - get_mdata_size()
+               - (chdr_w_bytes * _mdata_offset);
+    }
+
+    virtual const void* get_payload_const_ptr() const
+    {
+        return const_cast<void*>(
+            const_cast<chdr_packet_impl<chdr_w, endianness>*>(this)->get_payload_ptr());
+    }
+
+    virtual void* get_payload_ptr()
+    {
+        return reinterpret_cast<void*>(
+            _pkt_buff
+            + (chdr_w_stride * (_mdata_offset + get_chdr_header().get_num_mdata())));
+    }
+
+private:
+    inline bool _has_timestamp(const chdr_header& header) const
+    {
+        return (header.get_pkt_type() == PKT_TYPE_DATA_WITH_TS);
+    }
+
+    inline void _compute_mdata_offset() const
+    {
+        // The metadata offset depends on the chdr_w and whether we have a timestamp
+        if (chdr_w == 64) {
+            _mdata_offset = _has_timestamp(get_chdr_header()) ? 2 : 1;
+        } else {
+            _mdata_offset = 1;
+        }
+    }
+
+    inline static uint64_t u64_to_host(uint64_t word)
+    {
+        return (endianness == ENDIANNESS_BIG) ? uhd::ntohx<uint64_t>(word)
+                                              : uhd::wtohx<uint64_t>(word);
+    }
+
+    inline static uint64_t u64_from_host(uint64_t word)
+    {
+        return (endianness == ENDIANNESS_BIG) ? uhd::htonx<uint64_t>(word)
+                                              : uhd::htowx<uint64_t>(word);
+    }
+
+    static const size_t chdr_w_bytes  = (chdr_w / 8);
+    static const size_t chdr_w_stride = (chdr_w / 64);
+
+    // Packet state
+    const size_t _mtu_bytes      = 0;
+    mutable uint64_t* _pkt_buff  = nullptr;
+    mutable size_t _mdata_offset = 0;
+};
+
+chdr_packet_factory::chdr_packet_factory(chdr_w_t chdr_w, endianness_t endianness)
+    : _chdr_w(chdr_w), _endianness(endianness)
+{
+}
+
+chdr_packet::uptr chdr_packet_factory::make_generic(size_t mtu_bytes) const
+{
+    if (_endianness == ENDIANNESS_BIG) {
+        switch (_chdr_w) {
+            case CHDR_W_512:
+                return std::make_unique<chdr_packet_impl<512, ENDIANNESS_BIG>>(mtu_bytes);
+            case CHDR_W_256:
+                return std::make_unique<chdr_packet_impl<256, ENDIANNESS_BIG>>(mtu_bytes);
+            case CHDR_W_128:
+                return std::make_unique<chdr_packet_impl<128, ENDIANNESS_BIG>>(mtu_bytes);
+            case CHDR_W_64:
+                return std::make_unique<chdr_packet_impl<64, ENDIANNESS_BIG>>(mtu_bytes);
+            default:
+                assert(0);
+        }
+    } else {
+        switch (_chdr_w) {
+            case CHDR_W_512:
+                return std::make_unique<chdr_packet_impl<512, ENDIANNESS_LITTLE>>(
+                    mtu_bytes);
+            case CHDR_W_256:
+                return std::make_unique<chdr_packet_impl<256, ENDIANNESS_LITTLE>>(
+                    mtu_bytes);
+            case CHDR_W_128:
+                return std::make_unique<chdr_packet_impl<128, ENDIANNESS_LITTLE>>(
+                    mtu_bytes);
+            case CHDR_W_64:
+                return std::make_unique<chdr_packet_impl<64, ENDIANNESS_LITTLE>>(
+                    mtu_bytes);
+            default:
+                assert(0);
+        }
+    }
+    return chdr_packet::uptr();
+}
+
+chdr_ctrl_packet::uptr chdr_packet_factory::make_ctrl(size_t mtu_bytes) const
+{
+    return std::make_unique<chdr_ctrl_packet>(make_generic(mtu_bytes));
+}
+
+chdr_strs_packet::uptr chdr_packet_factory::make_strs(size_t mtu_bytes) const
+{
+    return std::make_unique<chdr_strs_packet>(make_generic(mtu_bytes));
+}
+
+chdr_strc_packet::uptr chdr_packet_factory::make_strc(size_t mtu_bytes) const
+{
+    return std::make_unique<chdr_strc_packet>(make_generic(mtu_bytes));
+}
+
+chdr_mgmt_packet::uptr chdr_packet_factory::make_mgmt(size_t mtu_bytes) const
+{
+    return std::make_unique<chdr_mgmt_packet>(make_generic(mtu_bytes));
+}
diff --git a/host/lib/rfnoc/chdr/chdr_types.cpp b/host/lib/rfnoc/chdr/chdr_types.cpp
new file mode 100644
index 000000000..8786b8193
--- /dev/null
+++ b/host/lib/rfnoc/chdr/chdr_types.cpp
@@ -0,0 +1,426 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhd/exception.hpp>
+#include <uhd/types/endianness.hpp>
+#include <uhdlib/rfnoc/chdr/chdr_types.hpp>
+#include <boost/format.hpp>
+#include <cassert>
+
+using namespace uhd;
+using namespace uhd::rfnoc::chdr;
+
+//----------------------------------------------------
+// Utility Functions
+//----------------------------------------------------
+
+static inline constexpr uint64_t mask_u64(size_t width)
+{
+    return ((uint64_t(1) << width) - 1);
+}
+
+template <typename field_t>
+static inline constexpr field_t get_field_u64(
+    uint64_t flat_hdr, size_t offset, size_t width)
+{
+    return static_cast<field_t>((flat_hdr >> offset) & mask_u64(width));
+}
+
+//----------------------------------------------------
+// CHDR Control Payload
+//----------------------------------------------------
+
+void ctrl_payload::populate_header(chdr_header& header) const
+{
+    header.set_pkt_type(PKT_TYPE_CTRL);
+    header.set_eob(false);
+    header.set_eov(false);
+    header.set_num_mdata(0);
+}
+
+size_t ctrl_payload::serialize(uint64_t* buff,
+    size_t max_size_bytes,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order) const
+{
+    UHD_ASSERT_THROW((data_vtr.size() > 0 && data_vtr.size() < 16));
+    // We assume that buff has room to hold the entire packet
+    size_t ptr = 0;
+
+    // Populate control header
+    buff[ptr++] = conv_byte_order(
+        ((static_cast<uint64_t>(dst_port) & mask_u64(DST_PORT_WIDTH)) << DST_PORT_OFFSET)
+        | ((static_cast<uint64_t>(src_port) & mask_u64(SRC_PORT_WIDTH))
+              << SRC_PORT_OFFSET)
+        | ((static_cast<uint64_t>(data_vtr.size()) & mask_u64(NUM_DATA_WIDTH))
+              << NUM_DATA_OFFSET)
+        | ((static_cast<uint64_t>(seq_num) & mask_u64(SEQ_NUM_WIDTH)) << SEQ_NUM_OFFSET)
+        | ((static_cast<uint64_t>(timestamp ? 1 : 0) & mask_u64(HAS_TIME_WIDTH))
+              << HAS_TIME_OFFSET)
+        | ((static_cast<uint64_t>(is_ack) & mask_u64(IS_ACK_WIDTH)) << IS_ACK_OFFSET)
+        | ((static_cast<uint64_t>(src_epid) & mask_u64(SRC_EPID_WIDTH))
+              << SRC_EPID_OFFSET));
+
+    // Populate optional timestamp
+    if (timestamp.is_initialized()) {
+        buff[ptr++] = conv_byte_order(timestamp.get());
+    }
+
+    // Populate control operation word
+    buff[ptr++] = conv_byte_order(
+        ((static_cast<uint64_t>(address) & mask_u64(ADDRESS_WIDTH)) << ADDRESS_OFFSET)
+        | ((static_cast<uint64_t>(byte_enable) & mask_u64(BYTE_ENABLE_WIDTH))
+              << BYTE_ENABLE_OFFSET)
+        | ((static_cast<uint64_t>(op_code) & mask_u64(OPCODE_WIDTH)) << OPCODE_OFFSET)
+        | ((static_cast<uint64_t>(status) & mask_u64(STATUS_WIDTH)) << STATUS_OFFSET)
+        | (static_cast<uint64_t>(data_vtr[0]) << HI_DATA_OFFSET));
+
+    // Populate the rest of the data
+    for (size_t i = 1; i < data_vtr.size(); i += 2) {
+        const uint32_t hi_data =
+            (((i + 2) >= data_vtr.size()) && (data_vtr.size() % 2 == 0))
+                ? 0
+                : data_vtr[i + 1];
+        buff[ptr++] =
+            conv_byte_order(static_cast<uint64_t>(hi_data) << HI_DATA_OFFSET
+                            | static_cast<uint64_t>(data_vtr[i]) << LO_DATA_OFFSET);
+    }
+
+    // FIXME: This UHD_ASSERT_THROW is a bit late because memory has already been
+    // corrupted
+    UHD_ASSERT_THROW(ptr <= max_size_bytes);
+    // Return bytes written
+    return (ptr * sizeof(uint64_t));
+}
+
+void ctrl_payload::deserialize(const uint64_t* buff,
+    size_t max_size_bytes,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order)
+{
+    // We assume that buff has room to hold the entire packet
+    size_t ptr = 0;
+
+    // Read control header
+    uint64_t ctrl_header = conv_byte_order(buff[ptr++]);
+    data_vtr.resize(get_field_u64<size_t>(ctrl_header, NUM_DATA_OFFSET, NUM_DATA_WIDTH));
+    UHD_ASSERT_THROW((data_vtr.size() > 0 && data_vtr.size() < 16));
+    dst_port = get_field_u64<uint16_t>(ctrl_header, DST_PORT_OFFSET, DST_PORT_WIDTH);
+    src_port = get_field_u64<uint16_t>(ctrl_header, SRC_PORT_OFFSET, SRC_PORT_WIDTH);
+    seq_num  = get_field_u64<uint8_t>(ctrl_header, SEQ_NUM_OFFSET, SEQ_NUM_WIDTH);
+    is_ack   = get_field_u64<bool>(ctrl_header, IS_ACK_OFFSET, IS_ACK_WIDTH);
+    src_epid = get_field_u64<uint16_t>(ctrl_header, SRC_EPID_OFFSET, SRC_EPID_WIDTH);
+
+    // Read optional timestamp
+    if (get_field_u64<bool>(ctrl_header, HAS_TIME_OFFSET, HAS_TIME_WIDTH)) {
+        timestamp = conv_byte_order(buff[ptr++]);
+    } else {
+        timestamp = boost::none;
+    }
+
+    // Read control operation word
+    uint64_t op_word = conv_byte_order(buff[ptr++]);
+    if (data_vtr.size() > 0) {
+        data_vtr[0] = get_field_u64<uint32_t>(op_word, HI_DATA_OFFSET, 32);
+    }
+    address     = get_field_u64<uint32_t>(op_word, ADDRESS_OFFSET, ADDRESS_WIDTH);
+    byte_enable = get_field_u64<uint8_t>(op_word, BYTE_ENABLE_OFFSET, BYTE_ENABLE_WIDTH);
+    op_code     = get_field_u64<ctrl_opcode_t>(op_word, OPCODE_OFFSET, OPCODE_WIDTH);
+    status      = get_field_u64<ctrl_status_t>(op_word, STATUS_OFFSET, STATUS_WIDTH);
+
+    // Read the rest of the data
+    for (size_t i = 1; i < data_vtr.size(); i += 2) {
+        uint64_t data_word = conv_byte_order(buff[ptr++]);
+        if (((i + 2) < data_vtr.size()) || (data_vtr.size() % 2 != 0)) {
+            data_vtr[i + 1] = get_field_u64<uint32_t>(data_word, HI_DATA_OFFSET, 32);
+        }
+        data_vtr[i] = get_field_u64<uint32_t>(data_word, LO_DATA_OFFSET, 32);
+    }
+    UHD_ASSERT_THROW(ptr <= max_size_bytes);
+}
+
+bool ctrl_payload::operator==(const ctrl_payload& rhs) const
+{
+    return (dst_port == rhs.dst_port) && (src_port == rhs.src_port)
+           && (seq_num == rhs.seq_num)
+           && (timestamp.is_initialized() == rhs.timestamp.is_initialized())
+           && ((!timestamp.is_initialized()) || (timestamp.get() == rhs.timestamp.get()))
+           && (is_ack == rhs.is_ack) && (src_epid == rhs.src_epid)
+           && (address == rhs.address) && (data_vtr == rhs.data_vtr)
+           && (byte_enable == rhs.byte_enable) && (op_code == rhs.op_code)
+           && (status == rhs.status);
+}
+
+const std::string ctrl_payload::to_string() const
+{
+    return str(
+        boost::format("ctrl_payload{dst_port:%d, dst_port:%d, seq_num:%d, timestamp:%s, "
+                      "is_ack:%s, src_epid:%d, address:0x%05x, byte_enable:0x%x, "
+                      "op_code:%d, status:%d, data[0]:0x%08x}\n")
+        % dst_port % src_port % int(seq_num)
+        % (timestamp.is_initialized() ? str(boost::format("0x%016x") % timestamp.get())
+                                      : std::string("<not present>"))
+        % (is_ack ? "true" : "false") % src_epid % address % int(byte_enable) % op_code
+        % status % data_vtr[0]);
+}
+
+//----------------------------------------------------
+// CHDR Stream Status Payload
+//----------------------------------------------------
+
+void strs_payload::populate_header(chdr_header& header) const
+{
+    header.set_pkt_type(PKT_TYPE_STRS);
+    header.set_eob(false);
+    header.set_eov(false);
+    header.set_num_mdata(0);
+}
+
+size_t strs_payload::serialize(uint64_t* buff,
+    size_t max_size_bytes,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order) const
+{
+    UHD_ASSERT_THROW(max_size_bytes >= (4 * sizeof(uint64_t)));
+
+    // Populate first word
+    buff[0] = conv_byte_order(
+        ((static_cast<uint64_t>(src_epid) & mask_u64(SRC_EPID_WIDTH)) << SRC_EPID_OFFSET)
+        | ((static_cast<uint64_t>(status) & mask_u64(STATUS_WIDTH)) << STATUS_OFFSET)
+        | ((static_cast<uint64_t>(capacity_bytes) & mask_u64(CAPACITY_BYTES_WIDTH))
+              << CAPACITY_BYTES_OFFSET));
+
+    // Populate second word
+    buff[1] = conv_byte_order(
+        ((static_cast<uint64_t>(capacity_pkts) & mask_u64(CAPACITY_PKTS_WIDTH))
+            << CAPACITY_PKTS_OFFSET)
+        | ((static_cast<uint64_t>(xfer_count_pkts) & mask_u64(XFER_COUNT_PKTS_WIDTH))
+              << XFER_COUNT_PKTS_OFFSET));
+
+    // Populate third word
+    buff[2] = conv_byte_order(xfer_count_bytes);
+
+    // Populate fourth word
+    buff[3] = conv_byte_order(
+        ((static_cast<uint64_t>(buff_info) & mask_u64(BUFF_INFO_WIDTH))
+            << BUFF_INFO_OFFSET)
+        | ((static_cast<uint64_t>(status_info) & mask_u64(STATUS_INFO_WIDTH))
+              << STATUS_INFO_OFFSET));
+
+    // Return bytes written
+    return (4 * sizeof(uint64_t));
+}
+
+void strs_payload::deserialize(const uint64_t* buff,
+    size_t num_elems,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order)
+{
+    UHD_ASSERT_THROW(num_elems >= 4);
+
+    // Read first word
+    uint64_t word0 = conv_byte_order(buff[0]);
+    src_epid       = get_field_u64<uint16_t>(word0, SRC_EPID_OFFSET, SRC_EPID_WIDTH);
+    status         = get_field_u64<strs_status_t>(word0, STATUS_OFFSET, STATUS_WIDTH);
+    capacity_bytes =
+        get_field_u64<uint64_t>(word0, CAPACITY_BYTES_OFFSET, CAPACITY_BYTES_WIDTH);
+
+    // Read second word
+    uint64_t word1 = conv_byte_order(buff[1]);
+    capacity_pkts =
+        get_field_u64<uint32_t>(word1, CAPACITY_PKTS_OFFSET, CAPACITY_PKTS_WIDTH);
+    xfer_count_pkts =
+        get_field_u64<uint64_t>(word1, XFER_COUNT_PKTS_OFFSET, XFER_COUNT_PKTS_WIDTH);
+
+    // Read third word
+    xfer_count_bytes = conv_byte_order(buff[2]);
+
+    // Read fourth word
+    uint64_t word3 = conv_byte_order(buff[3]);
+    buff_info      = get_field_u64<uint16_t>(word3, BUFF_INFO_OFFSET, BUFF_INFO_WIDTH);
+    status_info = get_field_u64<uint64_t>(word3, STATUS_INFO_OFFSET, STATUS_INFO_WIDTH);
+}
+
+bool strs_payload::operator==(const strs_payload& rhs) const
+{
+    return (src_epid == rhs.src_epid) && (status == rhs.status)
+           && (capacity_bytes == rhs.capacity_bytes)
+           && (capacity_pkts == rhs.capacity_pkts)
+           && (xfer_count_pkts == rhs.xfer_count_pkts)
+           && (xfer_count_bytes == rhs.xfer_count_bytes) && (buff_info == rhs.buff_info)
+           && (status_info == rhs.status_info);
+}
+
+const std::string strs_payload::to_string() const
+{
+    return str(boost::format("strs_payload{src_epid:%lu, status:%d, capacity_bytes:%lu, "
+                             "capacity_pkts:%lu, "
+                             "xfer_count_pkts:%lu, xfer_count_bytes:%lu, "
+                             "buff_info:0x%x, status_info:0x%x}\n")
+               % src_epid % int(status) % capacity_bytes % capacity_pkts % xfer_count_pkts
+               % xfer_count_bytes % buff_info % status_info);
+}
+
+//----------------------------------------------------
+// CHDR Stream Command Payload
+//----------------------------------------------------
+
+void strc_payload::populate_header(chdr_header& header) const
+{
+    header.set_pkt_type(PKT_TYPE_STRC);
+    header.set_eob(false);
+    header.set_eov(false);
+    header.set_num_mdata(0);
+}
+
+size_t strc_payload::serialize(uint64_t* buff,
+    size_t max_size_bytes,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order) const
+{
+    UHD_ASSERT_THROW(max_size_bytes >= (2 * sizeof(uint64_t)));
+
+    // Populate first word
+    buff[0] = conv_byte_order(
+        ((static_cast<uint64_t>(src_epid) & mask_u64(SRC_EPID_WIDTH)) << SRC_EPID_OFFSET)
+        | ((static_cast<uint64_t>(op_code) & mask_u64(OP_CODE_WIDTH)) << OP_CODE_OFFSET)
+        | ((static_cast<uint64_t>(op_data) & mask_u64(OP_DATA_WIDTH)) << OP_DATA_OFFSET)
+        | ((static_cast<uint64_t>(num_pkts) & mask_u64(NUM_PKTS_WIDTH))
+              << NUM_PKTS_OFFSET));
+
+    // Populate second word
+    buff[1] = conv_byte_order(num_bytes);
+
+    // Return bytes written
+    return (2 * sizeof(uint64_t));
+}
+
+void strc_payload::deserialize(const uint64_t* buff,
+    size_t num_elems,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order)
+{
+    UHD_ASSERT_THROW(num_elems >= 2);
+
+    // Read first word
+    uint64_t word0 = conv_byte_order(buff[0]);
+    src_epid       = get_field_u64<uint16_t>(word0, SRC_EPID_OFFSET, SRC_EPID_WIDTH);
+    op_code        = get_field_u64<strc_op_code_t>(word0, OP_CODE_OFFSET, OP_CODE_WIDTH);
+    op_data        = get_field_u64<uint8_t>(word0, OP_DATA_OFFSET, OP_DATA_WIDTH);
+    num_pkts       = get_field_u64<uint64_t>(word0, NUM_PKTS_OFFSET, NUM_PKTS_WIDTH);
+    // Read second word
+    num_bytes = conv_byte_order(buff[1]);
+}
+
+bool strc_payload::operator==(const strc_payload& rhs) const
+{
+    return (src_epid == rhs.src_epid) && (op_code == rhs.op_code)
+           && (op_data == rhs.op_data) && (num_pkts == rhs.num_pkts)
+           && (num_bytes == rhs.num_bytes);
+}
+
+const std::string strc_payload::to_string() const
+{
+    return str(boost::format("strc_payload{src_epid:%lu, op_code:%d, op_data:0x%x, "
+                             "num_pkts:%lu, num_bytes:%lu}\n")
+               % src_epid % int(op_code) % int(op_data) % num_pkts % num_bytes);
+}
+
+//----------------------------------------------------
+// CHDR Management Payload
+//----------------------------------------------------
+
+//! Serialize this hop into a list of 64-bit words
+size_t mgmt_hop_t::serialize(std::vector<uint64_t>& target,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order) const
+{
+    for (size_t i = 0; i < get_num_ops(); i++) {
+        target.push_back(
+            conv_byte_order((static_cast<uint64_t>(_ops.at(i).get_op_payload()) << 16)
+                            | (static_cast<uint64_t>(_ops.at(i).get_op_code()) << 8)
+                            | (static_cast<uint64_t>(get_num_ops() - i - 1) << 0)));
+    }
+    return get_num_ops();
+}
+
+//! Deserialize this hop into from list of 64-bit words
+void mgmt_hop_t::deserialize(
+    std::list<uint64_t>& src, const std::function<uint64_t(uint64_t)>& conv_byte_order)
+{
+    _ops.clear();
+    size_t ops_remaining = 0;
+    do {
+        // TODO: Change this to a legit exception
+        UHD_ASSERT_THROW(!src.empty());
+
+        uint64_t op_word = conv_byte_order(src.front());
+        ops_remaining    = static_cast<size_t>(op_word & 0xFF);
+        mgmt_op_t op(static_cast<mgmt_op_t::op_code_t>((op_word >> 8) & 0xFF),
+            static_cast<uint64_t>((op_word >> 16)));
+        _ops.push_back(op);
+        src.pop_front();
+    } while (ops_remaining > 0);
+}
+
+void mgmt_payload::populate_header(chdr_header& header) const
+{
+    header.set_pkt_type(PKT_TYPE_MGMT);
+    header.set_eob(false);
+    header.set_eov(false);
+    header.set_num_mdata(0);
+    header.set_vc(0);
+    header.set_dst_epid(0);
+}
+
+size_t mgmt_payload::serialize(uint64_t* buff,
+    size_t max_size_bytes,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order) const
+{
+    std::vector<uint64_t> target;
+    // Insert header
+    target.push_back(conv_byte_order(
+        (static_cast<uint64_t>(_protover) << 48)
+        | (static_cast<uint64_t>(static_cast<uint8_t>(_chdr_w) & 0x7) << 45)
+        | (static_cast<uint64_t>(get_num_hops() & 0x3FF) << 16)
+        | (static_cast<uint64_t>(_src_epid) << 0)));
+    // Insert data from each hop
+    for (const auto& hop : _hops) {
+        hop.serialize(target, conv_byte_order);
+    }
+    UHD_ASSERT_THROW(target.size() <= max_size_bytes);
+
+    // We use a vector and copy just for ease of implementation
+    // These transactions are not performance critical
+    std::copy(target.begin(), target.end(), buff);
+    return (target.size() * sizeof(uint64_t));
+}
+
+void mgmt_payload::deserialize(const uint64_t* buff,
+    size_t num_elems,
+    const std::function<uint64_t(uint64_t)>& conv_byte_order)
+{
+    UHD_ASSERT_THROW(num_elems > 1);
+
+    // We use a list and copy just for ease of implementation
+    // These transactions are not performance critical
+    std::list<uint64_t> src_list(buff, buff + num_elems);
+
+    _hops.clear();
+
+    // Deframe the header
+    uint64_t hdr = conv_byte_order(src_list.front());
+    _hops.resize(static_cast<size_t>((hdr >> 16) & 0x3FF));
+    _src_epid = static_cast<sep_id_t>(hdr & 0xFFFF);
+    _chdr_w   = static_cast<chdr_w_t>((hdr >> 45) & 0x7);
+    _protover = static_cast<uint16_t>((hdr >> 48) & 0xFFFF);
+    src_list.pop_front();
+
+    // Populate all hops
+    for (size_t i = 0; i < get_num_hops(); i++) {
+        _hops[i].deserialize(src_list, conv_byte_order);
+    }
+}
+
+const std::string mgmt_payload::to_string() const
+{
+    return str(boost::format(
+                   "mgmt_payload{src_epid:%lu, chdr_w:%d, protover:0x%x, num_hops:%lu}\n")
+               % _src_epid % int(_chdr_w) % _protover % _hops.size());
+}