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ipv4: Implement RX

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This commit is contained in:
Markus Koch 2022-10-30 22:32:47 +01:00
parent a19de6d0c8
commit 277d01737d
4 changed files with 249 additions and 13 deletions
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43
design/top_hwitl.vhd
View File

@ -183,10 +183,12 @@ architecture eth of top_hwitl is
constant F_CLK_PHY : integer := 140000000;
constant ETH_CONFIG : configuration_t := (
mac_address => (x"00", x"ff", x"ff", x"11", x"22", x"33")
mac_address => (x"00", x"FF", x"FF", x"11", x"22", x"33")
);
constant IP_CONFIG : ip_configuration_t := (
ip_address => (x"C0", x"A8", x"02", x"02")
constant IP_CONFIG : ipv4_configuration_t := (
ip_address => (x"C0", x"A8", x"02", x"02"),
subnet_mask => (x"FF", x"FF", x"FF", x"00"),
gateway => (x"C0", x"A8", x"02", x"01")
);
signal rst : std_logic;
@ -199,10 +201,10 @@ architecture eth of top_hwitl is
signal mac_in : mac_in_t;
constant PROT_ARP : integer := 0;
constant PROT_IP : integer := 1;
constant PROT_IPV4 : integer := 1;
constant ETHERNET_II_PROTOCOLS : ethernet_ii_protocol_vector := (
PROT_ARP => ETHERNET_II_PROTOCOL_ARP,
PROT_IP => ETHERNET_II_PROTOCOL_IP
PROT_IPV4 => ETHERNET_II_PROTOCOL_IPV4
);
signal ethernet_i_out : ethernet_i_out_t;
signal ethernet_i_in : ethernet_i_in_t;
@ -211,7 +213,23 @@ architecture eth of top_hwitl is
signal arp_out : arp_out_t;
signal arp_in : arp_in_t;
signal ipv4_out : ipv4_out_t;
signal ipv4_in : ipv4_in_t;
begin
trashernet_ipv4_inst : entity trashernet.trashernet_ipv4
port map(
clk => clk,
rst => rst,
ipv4_config => IP_CONFIG,
arp_out => arp_out,
arp_in => arp_in,
ethernet_ii_out => ethernet_ii_out(PROT_IPV4),
ethernet_ii_in => ethernet_ii_in(PROT_IPV4),
ipv4_out => ipv4_out,
ipv4_in => ipv4_in
);
trashernet_arp_inst : entity trashernet.trashernet_arp
generic map(
SYSTICK_FREQ => F_CLK
@ -304,9 +322,22 @@ begin
if (ethernet_ii_out(PROT_ARP).rx_header_rcv) then
report "RX ARP";
end if;
if (ethernet_ii_out(PROT_IP).rx_header_rcv) then
if (ethernet_ii_out(PROT_IPV4).rx_header_rcv) then
report "RX IP";
end if;
if ipv4_out.rx_data_valid then
report "RX IP data: " & to_hstring(ipv4_out.rx_data);
end if;
if ipv4_out.rx_ok_stb then
report "RX IP OK";
end if;
if ipv4_out.rx_error_stb then
report "RX IP error";
end if;
if ipv4_out.rx_header_rcv then
report "RX IP start. PROT=" & to_hstring(ipv4_out.rx_protocol) & ", FROM=" & ip_to_string(ipv4_out.rx_ip_address);
end if;
end if;
end process receiver;

2
trashernet/trashernet_arp.vhd
View File

@ -27,7 +27,7 @@ entity trashernet_arp is
-- Configuration
mac_config : in configuration_t; -- Trashernet MAC configuration
ip_config : in ip_configuration_t; -- Trashernet IP configuration
ip_config : in ipv4_configuration_t; -- Trashernet IP configuration
-- ARP application interface
arp_out : out arp_out_t; -- ARP IF (out from ARP)

142
trashernet/trashernet_ipv4.vhd Normal file
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@ -0,0 +1,142 @@
-- -------------------------------------------------------------------------- --
-- TRASHERNET - A Trashy Ethernet Stack for FPGAs --
-- -------------------------------------------------------------------------- --
-- trashernet_ipv4.vhd : Ethernet OSI Layer 3, Network (IPv4)
-- Implements packet handling and IP-Layer en-/decoding.
-- -------------------------------------------------------------------------- --
-- 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_ipv4 is
port(
-- Global
clk : in std_logic; -- Global clock
rst : in std_logic; -- Asynchronous reset
-- Configuration
ipv4_config : in ipv4_configuration_t; -- Trashernet IP configuration
-- ARP application interface
arp_out : in arp_out_t; -- ARP IF (out from ARP)
arp_in : out arp_in_t; -- ARP IF (into ARP)
-- Ethernet II application interface
ethernet_ii_out : in ethernet_ii_out_t; -- Ethernet II IF (out from MAC)
ethernet_ii_in : out ethernet_ii_in_t; -- Ethernet II IF (into MAC)
-- IPv4 application interface
ipv4_out : out ipv4_out_t; -- IPv4 IF (out from IP)
ipv4_in : in ipv4_in_t -- IPv4 IF (into IP)
);
end entity trashernet_ipv4;
architecture rtl of trashernet_ipv4 is
begin
rx : block
constant BYTECOUNT_HEADER : integer := 20; -- Mandatory header fields
signal sr : byte_vector(0 to BYTECOUNT_HEADER - 1);
alias sr_version is sr(0)(7 downto 4);
alias sr_ihl is sr(0)(3 downto 0);
alias sr_dscp is sr(1)(7 downto 2);
alias sr_ecn is sr(1)(1 downto 0);
alias sr_total_length is sr(2 to 3);
alias sr_identification is sr(4 to 5);
alias sr_flags is sr(6)(7 downto 5);
signal sr_fragment_offset : std_logic_vector(12 downto 0);
alias sr_ttl is sr(8);
alias sr_protocol is sr(9);
alias sr_header_cks is sr(10 to 11);
alias sr_source_ip is sr(12 to 15);
alias sr_destination_ip is sr(16 to 19);
signal header_ok : std_logic;
signal bytecount : integer range 0 to 65535;
signal shifted : std_logic;
signal block_done : std_logic;
type state_t is (HEADER, OPT, PAYLOAD, DONE);
signal state : state_t;
begin
sr_fragment_offset <= sr(6)(4 downto 0) & sr(7);
block_done <= '1' when bytecount = 0 else '0';
header_ok <= '1' when --
(std_logic_vector'(sr_flags(7) & sr_flags(5)) = "00") and -- Reserved = 0, MF unset
(to_integer(unsigned(sr_fragment_offset)) = 0) and -- No fragment offset -> not last fragment
(sr_destination_ip = ipv4_config.ip_address) else -- It's addressed to us. TODO: We do not support broadcasts
'0';
rx_fsm : process(clk, rst) is
begin
if rst then
state <= HEADER;
shifted <= '0';
ipv4_out.rx_ok_stb <= '0';
ipv4_out.rx_error_stb <= '0';
ipv4_out.rx_header_rcv <= '0';
bytecount <= BYTECOUNT_HEADER;
elsif rising_edge(clk) then
ipv4_out.rx_ok_stb <= '0';
ipv4_out.rx_error_stb <= '0';
ipv4_out.rx_header_rcv <= '0';
shifted <= ethernet_ii_out.rx_data_valid;
if (ethernet_ii_out.rx_crc_ok or ethernet_ii_out.rx_crc_error) then
state <= HEADER;
bytecount <= BYTECOUNT_HEADER;
ipv4_out.rx_error_stb <= ethernet_ii_out.rx_crc_error or to_std_logic(state = PAYLOAD);
ipv4_out.rx_ok_stb <= ethernet_ii_out.rx_crc_ok and to_std_logic(state = DONE);
end if;
if (ethernet_ii_out.rx_data_valid = '1') and (bytecount > 0) then
if state = HEADER then
sr <= sr(sr'low + 1 to sr'high) & ethernet_ii_out.rx_data;
end if;
bytecount <= bytecount - 1;
end if;
case state is
when HEADER =>
if block_done then
bytecount <= to_integer(unsigned(sr_ihl) - 5) * 4; -- five 32-bit words is the header itself
if header_ok then
state <= OPT;
ipv4_out.rx_header_rcv <= '1';
end if;
end if;
when OPT =>
if block_done then
bytecount <= to_integer(unsigned(std_logic_vector'(sr_total_length(2) & sr_total_length(3)))) - to_integer(unsigned(sr_ihl)) * 4;
state <= PAYLOAD;
end if;
when PAYLOAD =>
if block_done then
state <= DONE;
end if;
when DONE => -- @suppress "Dead state 'DONE'": Outgoing state transition is outside of case statement
null; -- We just wait here until the MAC gives us a CRC OK/error
end case;
end if;
end process rx_fsm;
ipv4_out.rx_data <= ethernet_ii_out.rx_data;
ipv4_out.rx_data_valid <= ethernet_ii_out.rx_data_valid when state = PAYLOAD else '0';
ipv4_out.rx_ip_address <= sr_source_ip;
ipv4_out.rx_protocol <= sr_protocol;
end block rx;
end architecture rtl;

69
trashernet/trashernet_pkg.vhd
View File

@ -37,9 +37,11 @@ package trashernet_pkg is
type configuration_t is record
mac_address : mac_addr_t; -- MAC address of this node
end record configuration_t;
type ip_configuration_t is record
type ipv4_configuration_t is record
ip_address : ip_addr_t; -- IP address of this node
end record ip_configuration_t;
gateway : ip_addr_t; -- Peer to use when target is outside of subnet
subnet_mask : ip_addr_t; -- Subnet mask of this node
end record ipv4_configuration_t;
-- PHY interface
type phy_in_t is record
@ -83,7 +85,7 @@ package trashernet_pkg is
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"))); -- @suppress "Null range": We want a NULL vector here to remove the logic
constant ETHERNET_II_PROTOCOL_IP : ethernet_ii_protocol_t := (ethertype => (x"08", x"00"));
constant ETHERNET_II_PROTOCOL_IPV4 : ethernet_ii_protocol_t := (ethertype => (x"08", x"00"));
constant ETHERNET_II_PROTOCOL_ARP : ethernet_ii_protocol_t := (ethertype => (x"08", x"06"));
type ethernet_i_out_t is record
@ -123,6 +125,7 @@ package trashernet_pkg is
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');
-- ARP interface
type arp_out_t is record
arp_mac : mac_addr_t; -- Resulting MAC address for query
arp_ok_stb : std_logic; -- ARP request successful, `arp_mac` valid
@ -132,6 +135,59 @@ package trashernet_pkg is
arp_ip : ip_addr_t; -- IP address to query
arp_query_stb : std_logic; -- Request MAC for IP
end record arp_in_t;
-- IPv4 interface
subtype ipv4_protocol is byte;
type ipv4_protocol_vector is array (natural range <>) of ipv4_protocol;
constant IPV4_PROTOCOL_ICMP : ipv4_protocol := x"01";
constant IPV4_PROTOCOL_TCP : ipv4_protocol := x"06";
constant IPV4_PROTOCOL_UDP : ipv4_protocol := x"11";
type ipv4_out_t is record
rx_ip_address : ip_addr_t; -- Source IP address
rx_protocol : ipv4_protocol; -- Transport Protocol
rx_data : byte; -- RX data
rx_data_valid : std_logic; -- RX data valid strobe
rx_ok_stb : std_logic; -- End of packet, checksum OK
rx_error_stb : std_logic; -- End of packet, checksum invalid
rx_header_rcv : std_logic; -- Start of reception (`rx_ip_address` and `rx_protocol` are valid)
tx_data_ack : std_logic; -- Give next data byte of disable `tx_en`
tx_ok_stb : std_logic; -- Transmission successful
tx_err_stb : std_logic; -- Transmission failed
end record ipv4_out_t;
type ipv4_in_t is record
tx_ip_address : ip_addr_t; -- Destination IP address
tx_protocol : ipv4_protocol; -- Transport Protocol
tx_data : byte; -- TX data
tx_en : std_logic; -- Start and continue transmitting
end record ipv4_in_t;
type ipv4_protocol_out_t is record
rx_ip_address : ip_addr_t; -- Source IP address
rx_data : byte; -- RX data
rx_data_valid : std_logic; -- RX data valid strobe
rx_ok : std_logic; -- End of packet, checksum OK
rx_error_stb : std_logic; -- End of packet, checksum invalid
rx_start_stb : std_logic; -- Start of reception
tx_data_ack : std_logic; -- Give next data byte of disable `tx_en`
tx_ok_stb : std_logic; -- Transmission successful
tx_err_stb : std_logic; -- Transmission failed
end record ipv4_protocol_out_t;
type ipv4_protocol_in_t is record
tx_ip_address : ip_addr_t; -- Destination IP address
tx_data : byte; -- TX data
tx_en : std_logic; -- Start and continue transmitting
end record ipv4_protocol_in_t;
type ipv4_protocol_out_vector is array (natural range <>) of ipv4_protocol_out_t;
type ipv4_protocol_in_vector is array (natural range <>) of ipv4_protocol_in_t;
-- General helper functions
function to_std_logic(constant bool : boolean) return std_logic;
end package trashernet_pkg;
package body trashernet_pkg is
@ -156,4 +212,11 @@ package body trashernet_pkg is
to_string(to_integer(unsigned(ip_address(3)))) --
;
end function ip_to_string;
function to_std_logic(constant bool : boolean) return std_logic is
variable ret : std_logic;
begin
ret := '1' when bool else '0';
return ret;
end function to_std_logic;
end package body trashernet_pkg;