rfnoc: Update the MTU forwarding property for some blocks

Note that the default MTU forwarding policy is ONE_TO_ONE, therefore,
it is only strictly necessary to modify the MTU forwarding policy for
blocks that route data in a different manner. However, it may be nice to
explicitly state the forwarding policy for the benefit of the reader.

The following blocks had their policies updated:
- addsub: ONE_TO_FAN
- duc: ONE_TO_ONE
- dmafifo: ONE_TO_ONE
- null block: DROP
- replay block: DROP
- split stream: ONE_TO_FAN
- switchboard: ONE_TO_FAN

1 files changed, 3 insertions, 0 deletions

diff --git a/host/lib/rfnoc/dmafifo_block_control.cpp b/host/lib/rfnoc/dmafifo_block_control.cpp
index efc8d27cb..cecd9ff3e 100644
--- a/host/lib/rfnoc/dmafifo_block_control.cpp
+++ b/host/lib/rfnoc/dmafifo_block_control.cpp
@@ -30,6 +30,9 @@ public:
         UHD_ASSERT_THROW(get_num_input_ports() == get_num_output_ports());
         set_action_forwarding_policy(forwarding_policy_t::ONE_TO_ONE);
         set_prop_forwarding_policy(forwarding_policy_t::ONE_TO_ONE);
+        // This line is not strictly necessary, as ONE_TO_ONE is the default.
+        // We set it make it explicit how this block works.
+        set_mtu_forwarding_policy(forwarding_policy_t::ONE_TO_ONE);
         // Now init DMA/DRAM control
         _fifo_cores.reserve(get_num_input_ports());
         for (size_t i = 0; i < get_num_input_ports(); i++) {