fpga: lib: Add NET_CHDR_W parameter to transport adapters

The NET_CHDR_W parameter tells the transport adapter what CHDR width
is used in transport packets, such as Ethernet packets. By default the
CHDR width used by the transport and RFNoC core will be the same. The
NET_CHDR_W parameter can be used in situations where the RFNoC core
expects a CHDR width from the transport adapter that is different from
that used over the network. In this situation, the transport adapter
will rewrite the CHDR packets so that each side gets the expected CHDR
width.


Original-commit: a9e49b7c587ef778ee0fe327e8bdcb15e0b0fc95

lib/rfnoc/xport_sv/eth_ipv4_interface.sv

@@ -23,7 +23,8 @@
 //           Ethernet clock domain (eth_rx, eth_tx).
 //   - ENET_W: Width of the link to the Ethernet MAC
 //   - CPU_W: Width of the CPU interface
-//   - CHDR_W: Width of the CHDR interface
+//   - CHDR_W: CHDR width used by RFNoC on the FPGA
+//   - NET_CHDR_W: CHDR width used over the network connection
 //
 
 module eth_ipv4_interface #(
@@ -42,7 +43,8 @@ module eth_ipv4_interface #(
   bit          PAUSE_EN         = 0,
   int          ENET_W           = 64,
   int          CPU_W            = 64,
-  int          CHDR_W           = 64
+  int          CHDR_W           = 64,
+  int          NET_CHDR_W       = CHDR_W
 ) (
   input logic        bus_clk,
   input logic        bus_rst,
@@ -283,7 +285,8 @@ module eth_ipv4_interface #(
     .SYNC            (SYNC),
     .ENET_W          (ENET_W),
     .CPU_W           (CPU_W),
-    .CHDR_W          (CHDR_W)
+    .CHDR_W          (CHDR_W),
+    .NET_CHDR_W      (NET_CHDR_W)
   ) eth_adapter_i (
     .eth_pause_req   (eth_pause_req),
     .eth_rx          (eth_rx   ),