From 6900a41528b1ecc7b541bf560e0329bc396e85c6 Mon Sep 17 00:00:00 2001 From: Markus Koch Date: Sat, 12 Feb 2022 13:24:49 +0100 Subject: [PATCH] wip: eth --- trashernet/trashernet_eth.vhd | 128 ++++++++++++++++++++++++++++++++++ trashernet/trashernet_pkg.vhd | 34 +++++++++ 2 files changed, 162 insertions(+) create mode 100644 trashernet/trashernet_eth.vhd diff --git a/trashernet/trashernet_eth.vhd b/trashernet/trashernet_eth.vhd new file mode 100644 index 0000000..ff3ddc1 --- /dev/null +++ b/trashernet/trashernet_eth.vhd @@ -0,0 +1,128 @@ +-- -------------------------------------------------------------------------- -- +-- TRASHERNET - A Trashy Ethernet Stack for FPGAs -- +-- -------------------------------------------------------------------------- -- +-- trashernet_mac_top.vhd : Ethernet OSI Layer 2, Data Link, filtered +-- Implements header creation, parsing, and protocol arbitration. +-- -------------------------------------------------------------------------- -- +-- Author : Markus Koch +-- 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( + F_CLK : in integer; -- Clock frequency of design IF + F_CLK_PHY : in integer; -- PHY clock (expected to be faster than F_CLK) + 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 + signal sel : integer range ethernet_ii_out'low 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 + null; -- TODO: Not yet implemented + + 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 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; + end block rx; + + tx : block + type state_t is (IDLE, TXD); + signal state : state_t; + signal sel : integer range ethernet_ii_in'low 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 + 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; + + when TXD => + state <= IDLE when (mac_in.tx_mac_data_en or mac_out.tx_active); + end case; + end if; + end process arb; + + 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 generate + ethernet_ii_out(i).tx_data_ack <= mac_out.tx_mac_data_ack when sel = i else '0'; + end generate 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; + mac_in.tx_header.mac_source <= config.mac_address; + + end block tx; + +end architecture rtl; diff --git a/trashernet/trashernet_pkg.vhd b/trashernet/trashernet_pkg.vhd index fe56b9a..9c5244e 100644 --- a/trashernet/trashernet_pkg.vhd +++ b/trashernet/trashernet_pkg.vhd @@ -29,6 +29,11 @@ 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 @@ -65,6 +70,35 @@ 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 + tbd : std_logic; -- TODO + end record; + type ethernet_i_in_t is record + tbd : std_logic; -- TODO + end record; + constant ETHERNET_I_IN_UNUSED : ethernet_i_in_t := (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