rfnoc: add rx and tx transports, and amend rfnoc_graph

transports:

Transports build on I/O service and implements flow control and
sequence number checking.

The rx streamer subclass extends the streamer implementation to connect
it to the rfnoc graph. It receives configuration values from property
propagation and configures the streamer accordingly. It also implements
the issue_stream_cmd rx_streamer API method.

Add implementation of rx streamer creation and method to connect it to
an rfnoc block.

rfnoc_graph: Cache more connection info, clarify contract

Summary of changes:
- rfnoc_graph stores more information about static connections at the
  beginning. Some search algorithms are replaced by simpler lookups.
- The contract for connect() was clarified. It is required to call
  connect, even for static connections.

1 files changed, 9 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/rfnoc/chdr_packet.hpp b/host/lib/include/uhdlib/rfnoc/chdr_packet.hpp
index 770c6cf6f..cc729de6c 100644
--- a/host/lib/include/uhdlib/rfnoc/chdr_packet.hpp
+++ b/host/lib/include/uhdlib/rfnoc/chdr_packet.hpp
@@ -114,6 +114,15 @@ public:
      */
     virtual void* get_payload_ptr() = 0;
 
+    /*! Return the payload offset in bytes for a given type and num_mdata
+     *
+     * \param pkt_type The packet type for calculation
+     * \param num_mdata The number of metadata words for calculation
+     * \return The offset of the payload in a packet with the given params
+     */
+    virtual size_t calculate_payload_offset(const packet_type_t pkt_type,
+        const uint8_t num_mdata = 0) const = 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