bench: Use VUnit

Well, not really. This just makes it compile and work with VUNIT,
but it's not a real VUnit test bench. Will do that at some other
point.

.gitignore

@@ -0,0 +1 @@
+vunit_out

bench/bench_trashernet_mac.vhd

@@ -18,7 +18,13 @@ use work.bench_pkg.all;
 library trashernet;
 use trashernet.trashernet_pkg.all;
 
+library vunit_lib;
+context vunit_lib.vunit_context;
+
 entity bench_trashernet_mac is
+	generic(
+		runner_cfg : string
+	);
 end entity bench_trashernet_mac;
 
 architecture bench of bench_trashernet_mac is
@@ -37,6 +43,8 @@ architecture bench of bench_trashernet_mac is
 
 	constant TEST_BENCH_LOOPBACK : boolean := true;
 
+	signal mac_tx_start : std_logic := '0';
+
 begin
 	trashernet_phy_cdc_inst : entity trashernet.trashernet_phy_cdc
 		generic map(
@@ -144,6 +152,8 @@ begin
 
 	mac_tx : process is
 	begin
+		wait on mac_tx_start;
+
 		mac_in.tx_mac_data               <= x"11";
 		mac_in.tx_header.mac_destination <= (x"12", x"23", x"34", x"45", x"56", x"67");
 		mac_in.tx_header.mac_source      <= (x"a2", x"a3", x"a4", x"a5", x"a6", x"a7");
@@ -159,8 +169,27 @@ begin
 		wait until rising_edge(mac_out.tx_mac_data_ack);
 		wait until rising_edge(clk);
 		mac_in.tx_mac_data_en <= '0';
-
-		wait;
 	end process mac_tx;
 
+	test : process is
+	begin
+		wait for 1 ns;
+
+		test_runner_setup(runner, runner_cfg);
+
+		while test_suite loop
+
+			if run("mac_tx_rx_simple") then
+				mac_tx_start <= not mac_tx_start;
+				wait on mac_out.rx_mac_crc_ok, mac_out.rx_mac_crc_error for 1 ms;
+				assert mac_out.rx_mac_crc_ok = '1' report "Did not receive CRC OK" severity error;
+			end if;
+		end loop;
+
+		wait for 1 ns;
+		wait until rising_edge(clk);
+
+		test_runner_cleanup(runner);
+	end process test;
+
 end architecture bench;

run.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+from vunit import VUnit
+import os
+
+library_names = ["trashernet", "bench"]
+
+
+libs = {}
+
+vu = VUnit.from_argv()
+
+for library_name in library_names:
+	libs[library_name] = vu.add_library(library_name)
+	libs[library_name].add_source_files(os.path.join(library_name, "*.vhd"))
+
+vu.main()