uhd: Introduce I/O service manager

- Implement I/O service detach link methods
- The I/O service manager instantiates new I/O services or connects
  links to existing I/O services based on options provided by the user
  in stream_args.
- Add a streamer ID parameter to methods to create transports so that
  the I/O service manager can group transports appropriately when using
  offload threads.
- Change X300 and MPMD to use I/O service manager to connect links to
  I/O services.
- There is now a single I/O service manager per rfnoc_graph (and it is
  also stored in the graph)
- The I/O service manager now also knows the device args for the
  rfnoc_graph it was created with, and can make decisions based upon
  those (e.g, use a specific I/O service for DPDK, share cores between
  streamers, etc.)
- The I/O Service Manager does not get any decision logic with this
  commit, though
- The MB ifaces for mpmd and x300 now access this global I/O service
  manager
- Add configuration of link parameters with overrides

Co-Authored-By: Martin Braun <martin.braun@ettus.com>
Co-Authored-By: Aaron Rossetto <aaron.rossetto@ni.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/rfnoc/rfnoc_common.hpp b/host/lib/include/uhdlib/rfnoc/rfnoc_common.hpp
index c2ec4e0e3..226d4f069 100644
--- a/host/lib/include/uhdlib/rfnoc/rfnoc_common.hpp
+++ b/host/lib/include/uhdlib/rfnoc/rfnoc_common.hpp
@@ -95,6 +95,11 @@ constexpr uint32_t MAX_FC_FREQ_PKTS      = (uint32_t(1) << 24) - 1;
 constexpr uint64_t MAX_FC_HEADROOM_BYTES = (uint64_t(1) << 16) - 1;
 constexpr uint32_t MAX_FC_HEADROOM_PKTS  = (uint32_t(1) << 8) - 1;
 
+// RFNoC devices need a minimum of two frame buffers to be available from the
+// link--one for the data transport and one for the control transport to
+// simultaneously handle MGMT and STRC/STRS initialization packets.
+constexpr size_t MIN_NUM_FRAMES = 2;
+
 }} // namespace uhd::rfnoc
 
 #endif /* INCLUDED_RFNOC_RFNOC_COMMON_HPP */