fpga/trashernet
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base: fpga:a15fb1f389636e4f2b7501f027783d6063799356
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fpga:master
fpga:feature/trashernet-soc
fpga:feature/trashernet-as
fpga:fix/gateway
fpga:fix/prot_muxing
fpga:feature/ipv4
fpga:feature/arp
fpga:wip/cococi
fpga:v0.2
fpga:v0.1
..
compare: fpga:4b4e5fdbfa4b0af912e228c79a0ec63e867e2441
Branches Tags
fpga:feature/trashernet-soc
fpga:master
fpga:feature/trashernet-as
fpga:fix/gateway
fpga:fix/prot_muxing
fpga:feature/ipv4
fpga:feature/arp
fpga:wip/cococi
fpga:v0.2
fpga:v0.1

2 Commits
a15fb1f389 ... 4b4e5fdbfa

Author SHA1 Message Date
Markus Koch
4b4e5fdbfa bench: hw_itl: Calculate and append FCS for incoming frames 2022-05-13 18:20:13 +02:00
Markus Koch
0e80900426 bench: hw_itl: Add comments 2022-05-13 18:19:35 +02:00
4 changed files with 21 additions and 196 deletions
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19
cocotb/hw_itl.py
View File

@ -1,4 +1,4 @@
#!/usr/bin/env python
#!/usr/bin/env python3
import cocotb
from cocotb.triggers import *
@ -13,6 +13,14 @@ import time
import os
import asyncio
import fcntl
import zlib
'''
# Set up virtual device using
sudo ip link add virt0 type dummy
sudo ip link set up virt0
sudo ip addr add 192.168.2.10/24 dev virt0
'''
class MacDevReceiver():
def __init__(self, dut, eth_tx, eth_rx, dev):
@ -28,13 +36,20 @@ class MacDevReceiver():
ETH_P_ALL=3
self.macdev=socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(ETH_P_ALL))
self.macdev.bind((dev, 0))
fcntl.fcntl(self.macdev, fcntl.F_SETFL, os.O_NONBLOCK)
fcntl.fcntl(self.macdev, fcntl.F_SETFL, os.O_NONBLOCK) # Not the best way to poll, but I couldn't get asyncio to play nicely with threading...
def eth_fcs(self, data):
crc = zlib.crc32(data) & 0xFFFF_FFFF
return crc.to_bytes(4, byteorder='little')
async def main(self):
ETH_HEAD = b'\x55\x55\x55\x55\xD5'
while True:
try:
r = self.macdev.recv(2000)
if len(r) < 60:
r += b'\x00' * (60 - len(r))
r += self.eth_fcs(r)
await self.eth_tx.send(ETH_HEAD + r);
except:
await Timer(1, "us")

4
design/top_mac_test.vhd
View File

@ -52,6 +52,10 @@ architecture rtl of top_mac_test is
others => false
);
type configuration_t is record
mac_address : mac_addr_t;
end record configuration_t;
constant ETH_CONFIG : configuration_t := (
mac_address => (x"00", x"ff", x"ff", x"11", x"22", x"33")
);

152
trashernet/trashernet_eth.vhd
View File

@ -1,152 +0,0 @@
-- -------------------------------------------------------------------------- --
-- TRASHERNET - A Trashy Ethernet Stack for FPGAs --
-- -------------------------------------------------------------------------- --
-- trashernet_eth.vhd : Ethernet OSI Layer 2, Data Link, ETH I/II Ethertype
-- Implements arbitration of different ethertypes.
-- -------------------------------------------------------------------------- --
-- Author : Markus Koch <markus@notsyncing.net>
-- Contributors : None
-- License : Mozilla Public License (MPL) Version 2
-- -------------------------------------------------------------------------- --
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.trashernet_pkg.all;
entity trashernet_eth is
generic(
ETHERNET_II_PROTOCOLS : ethernet_ii_protocol_vector := ETHERNET_II_PROTOCOLS_NONE
);
port(
-- Global
clk : in std_logic; -- Global clock
rst : in std_logic; -- Asynchronous reset
-- MAC application interface
mac_out : in mac_out_t; -- MAC application IF (out of MAC)
mac_in : out mac_in_t; -- MAC application IF (into MAC)
-- Configuration
config : in configuration_t; -- Global Trashernet configuration
-- Ethernet 802.3 application interface
ethernet_i_out : out ethernet_i_out_t; -- Ethernet 802.3 IF (out from MAC)
ethernet_i_in : in ethernet_i_in_t := ETHERNET_I_IN_UNUSED; -- Ethernet 802.3 IF (out from MAC)
-- Ethernet II application interface
ethernet_ii_out : out ethernet_ii_out_vector(ETHERNET_II_PROTOCOLS'range); -- Ethernet II IF (out from MAC)
ethernet_ii_in : in ethernet_ii_in_vector(ETHERNET_II_PROTOCOLS'range) := (others => ETHERNET_II_IN_UNUSED) -- Ethernet II IF (into MAC)
);
end entity trashernet_eth;
architecture rtl of trashernet_eth is
begin
rx : block
constant SEL_ETH_I : integer := ethernet_ii_out'low - 1;
signal sel : integer range SEL_ETH_I to ethernet_ii_out'high;
signal mac_destination_matches : std_logic;
begin
mac_destination_matches <= '1' when --
((mac_out.rx_header.mac_destination = (x"FF", x"FF")) or --
(mac_out.rx_header.mac_destination = config.mac_address)) else
'0';
mux : process(clk, rst) is
begin
if rst then
elsif rising_edge(clk) then
if mac_out.rx_mac_header_rcv then
if mac_destination_matches then
if (unsigned(std_logic_vector'(mac_out.rx_header.mac_ethertype(0) & mac_out.rx_header.mac_ethertype(1))) < 1500) then -- Ethernet 802.3 Frame
sel <= SEL_ETH_I;
else -- Ethernet II Frame
for i in ETHERNET_II_PROTOCOLS'range loop
if (mac_out.rx_header.mac_ethertype = ETHERNET_II_PROTOCOLS(i).ethertype) then
sel <= i;
end if;
end loop;
end if;
end if;
end if;
end if;
end process mux;
-- Shared fields in the Ethernet II application interface
shared_fields : for i in ethernet_ii_out'range generate
ethernet_ii_out(i).rx_mac_address <= mac_out.rx_header.mac_source;
ethernet_ii_out(i).rx_data <= mac_out.rx_mac_data;
ethernet_ii_out(i).rx_data_valid <= mac_out.rx_mac_valid when sel = i;
end generate shared_fields;
-- Shared fields in the Ethernet application interface
ethernet_i_out.rx_data <= mac_out.rx_mac_data;
ethernet_i_out.rx_data_valid <= mac_out.rx_mac_valid when sel = SEL_ETH_I;
ethernet_i_out.rx_mac_address <= mac_out.rx_header.mac_source;
ethernet_i_out.rx_length <= unsigned(mac_out.rx_header.mac_ethertype(0)) & unsigned(mac_out.rx_header.mac_ethertype(1));
end block rx;
tx : block
type state_t is (IDLE, TXD);
signal state : state_t;
constant SEL_ETH_I : integer := ethernet_ii_out'low - 1;
signal sel : integer range SEL_ETH_I to ethernet_ii_in'high;
begin
arb : process(clk, rst) is
begin
if rst then
elsif rising_edge(clk) then
case state is
when IDLE =>
if mac_out.tx_active then
if (ethernet_i_in.tx_en) then -- ETH I has priority
sel <= SEL_ETH_I;
state <= TXD;
else
for i in ethernet_ii_in'range loop
if ethernet_ii_in(i).tx_en then
sel <= i;
state <= TXD;
exit; -- Prioritize according to vector
end if;
end loop;
end if;
end if;
when TXD =>
state <= IDLE when (mac_in.tx_mac_data_en or mac_out.tx_active);
end case;
end if;
end process arb;
mux : process(all) is
begin
if (sel = SEL_ETH_I) then
mac_in.tx_mac_data_en <= ethernet_i_in.tx_en;
mac_in.tx_mac_data <= ethernet_i_in.tx_data;
ethernet_i_out.tx_data_ack <= mac_out.tx_mac_data_ack;
mac_in.tx_header.mac_destination <= ethernet_i_in.tx_mac_address;
mac_in.tx_header.mac_ethertype <= byte(ethernet_i_in.tx_length(15 downto 8)) & byte(ethernet_i_in.tx_length(7 downto 0));
else
mac_in.tx_mac_data_en <= ethernet_ii_in(sel).tx_en;
mac_in.tx_mac_data <= ethernet_ii_in(sel).tx_data;
txack : for i in ethernet_ii_out'range loop
ethernet_ii_out(i).tx_data_ack <= mac_out.tx_mac_data_ack when sel = i else '0';
end loop txack;
mac_in.tx_header.mac_destination <= ethernet_ii_in(sel).tx_mac_address;
mac_in.tx_header.mac_ethertype <= ETHERNET_II_PROTOCOLS(sel).ethertype;
end if;
mac_in.tx_header.mac_source <= config.mac_address;
end process mux;
end block tx;
end architecture rtl;

42
trashernet/trashernet_pkg.vhd
View File

@ -10,7 +10,6 @@
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package trashernet_pkg is
-- General types
@ -30,11 +29,6 @@ package trashernet_pkg is
-- IP specific types
subtype ip_addr_t is byte_vector(0 to 3);
-- Configuration interface
type configuration_t is record
mac_address : mac_addr_t; -- MAC address of this node
end record configuration_t;
-- PHY interface
type phy_in_t is record
tx_data : byte; -- TX Data
@ -71,42 +65,6 @@ package trashernet_pkg is
rx_mac_crc_error : std_logic; -- End of packet, CRC invalid
end record mac_out_t;
-- MAC ETH interface
type ethernet_ii_protocol_t is record
ethertype : ethertype_t;
end record;
type ethernet_ii_protocol_vector is array (natural range <>) of ethernet_ii_protocol_t;
constant ETHERNET_II_PROTOCOLS_NONE : ethernet_ii_protocol_vector(0 to -1) := (others => (ethertype => (x"00", x"00"))); -- NULL range
type ethernet_i_out_t is record
rx_mac_address : mac_addr_t; -- Source MAC address
rx_data : byte; -- RX data
rx_data_valid : std_logic; -- RX data valid strobe
tx_data_ack : std_logic; -- Give next data byte or disable `tx_en`
rx_length : unsigned(15 downto 0); -- RX payload length in bytes
end record;
type ethernet_i_in_t is record
tx_mac_address : mac_addr_t; -- Destination MAC address
tx_data : byte; -- TX data
tx_en : std_logic; -- Start and continue transmitting
tx_length : unsigned(15 downto 0); -- TX payload length in bytes
end record;
constant ETHERNET_I_IN_UNUSED : ethernet_i_in_t := (tx_mac_address => (others => x"00"), tx_data => x"00", tx_length => x"0000", others => '0'); -- TODO
type ethernet_ii_out_t is record
rx_mac_address : mac_addr_t; -- Source MAC address
rx_data : byte; -- RX data
rx_data_valid : std_logic; -- RX data valid strobe
tx_data_ack : std_logic; -- Give next data byte or disable `tx_en`
end record;
type ethernet_ii_in_t is record
tx_mac_address : mac_addr_t; -- Destination MAC address
tx_data : byte; -- TX data
tx_en : std_logic; -- Start and continue transmitting
end record;
type ethernet_ii_out_vector is array (natural range <>) of ethernet_ii_out_t;
type ethernet_ii_in_vector is array (natural range <>) of ethernet_ii_in_t;
constant ETHERNET_II_IN_UNUSED : ethernet_ii_in_t := (tx_mac_address => (others => x"00"), tx_data => x"00", others => '0');
end package trashernet_pkg;
package body trashernet_pkg is