fpga: lib: Add width agnostic version of Ethernet Interface

The rnfoc/xport section is refactored in System Verilog to allow the
following improvements
(1) CPU_W - Sets the size of the c2e and e2c pipes.  This can be run
    at a different clock rate than the main ethernet pipe
(2) CHDR_W - Sets the size of the v2e and e2v pipes. This can be run
    at a different clock rate than the main ethernet pipe
(3) ENET_W - Sets the size of the eth_tx and eth_rx pipes.

eth_interface_tb runs traffic from e2c,e2v,v2e,c2e simultaneously
against the original xport_sv implementation, and against the new
implementation with widths of 64/128/512. A chdr_management node
info request queries the port info of the node0 in the eth_interface.

eth_ifc_synth_test.sv can be compiled with the make xsim target to test
out the size of various configurations.


Original-commit: eed4988cc266a63370a4332351d02fadedde3a3b

lib/rfnoc/xport_sv/Makefile.srcs

@@ -0,0 +1,16 @@
+#
+# Copyright 2020 Ettus Research, a National Instruments Brand
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+#
+
+##################################################
+# RFNoC Utility Sources
+##################################################
+RFNOC_XPORT_SV_SRCS = $(abspath $(addprefix $(BASE_DIR)/../lib/rfnoc/xport_sv/, \
+chdr_xport_adapter.sv \
+eth_ipv4_add_udp.sv \
+eth_ipv4_chdr_adapter.sv \
+eth_ipv4_chdr_dispatch.sv \
+eth_ipv4_interface.sv \
+))