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URL https://opencores.org/ocsvn/udp_ip_stack/udp_ip_stack/trunk

Subversion Repositories udp_ip_stack

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  • This comparison shows the changes necessary to convert path
    /udp_ip_stack/trunk/rtl/vhdl
    from Rev 4 to Rev 6
    Reverse comparison

Rev 4 → Rev 6

/arp.vhd
193,6 → 193,9
if arp_req_req.lookup_req = '1' and arp_req_req.ip = arp_entry.ip and arp_entry.is_valid = '1' then
arp_req_rslt.got_mac <= '1';
arp_req_rslt.mac <= arp_entry.mac;
elsif arp_req_req.lookup_req = '1' then
arp_req_rslt.got_mac <= '0'; -- hold off got_mac while req is there as arp_entry will not be correct yet
arp_req_rslt.mac <= arp_entry.mac;
else
arp_req_rslt.got_mac <= mac_addr_valid_reg;
arp_req_rslt.mac <= mac_addr_found;
/ml605/UDP_integration_example.vhd
141,6 → 141,7
signal set_tx_started : set_clr_type;
signal set_tx_fin : set_clr_type;
signal set_udp_rx_start_reg : set_clr_type;
signal first_byte_rx : STD_LOGIC_VECTOR(7 downto 0);
begin
 
171,17 → 172,18
end process;
-- AUTO TX process - on receipt of any UDP pkt, send a response
-- AUTO TX process - on receipt of any UDP pkt, send a response,
-- TX response process - COMB
tx_proc_combinatorial: process(
-- inputs
udp_rx_start_int, udp_tx_data_out_ready_int, udp_tx_int.data.data_out_valid, PBTX, reset_leds,
udp_rx_start_int, udp_tx_data_out_ready_int, udp_tx_int.data.data_out_valid,
udp_rx_int, PBTX, reset_leds,
-- state
state, count, tx_hdr, tx_start_reg, tx_started_reg, tx_fin_reg, udp_rx_start_reg,
-- controls
next_state, set_state, set_count, set_hdr, set_tx_start, set_last,
set_tx_started, set_tx_fin, set_udp_rx_start_reg
set_tx_started, set_tx_fin, set_udp_rx_start_reg, first_byte_rx
)
begin
-- set output_followers
199,6 → 201,7
set_tx_started <= HOLD;
set_tx_fin <= HOLD;
set_udp_rx_start_reg <= HOLD;
first_byte_rx <= (others => '0');
-- FSM
case state is
207,6 → 210,11
udp_tx_int.data.data_out <= (others => '0');
udp_tx_int.data.data_out_valid <= '0';
if udp_rx_start_int = '1' or PBTX = '1' then
if udp_rx_start_int = '1' then
first_byte_rx <= udp_rx_int.data.data_in;
else
first_byte_rx <= x"00";
end if;
set_udp_rx_start_reg <= SET;
set_tx_started <= SET;
set_hdr <= '1';
278,7 → 286,12
-- set tx hdr
if set_hdr = '1' then
tx_hdr.dst_ip_addr <= udp_rx_int.hdr.src_ip_addr;
-- if the first byte of the rx pkt is 'B' then send to broadcast, otherwise send to reply IP
if first_byte_rx = x"42" then
tx_hdr.dst_ip_addr <= IP_BC_ADDR;
else
tx_hdr.dst_ip_addr <= udp_rx_int.hdr.src_ip_addr;
end if;
tx_hdr.dst_port <= udp_rx_int.hdr.src_port;
tx_hdr.src_port <= udp_rx_int.hdr.dst_port;
tx_hdr.data_length <= x"0004";
/ipv4_types.vhd
9,6 → 9,9
 
package ipv4_types is
 
constant IP_BC_ADDR : std_logic_vector (31 downto 0) := x"ffffffff";
constant MAC_BC_ADDR : std_logic_vector (47 downto 0) := x"ffffffffffff";
 
--------------
-- IPv4 TX --
--------------
48,6 → 51,7
src_ip_addr : STD_LOGIC_VECTOR (31 downto 0);
num_frame_errors : std_logic_vector (7 downto 0);
last_error_code : std_logic_vector (3 downto 0); -- see RX_EC_xxx constants
is_broadcast : std_logic; -- set if the msg received is a broadcast
end record;
 
type ipv4_rx_type is record
/IPv4_RX.vhd
19,6 → 19,7
-- Revision:
-- Revision 0.01 - File Created
-- Revision 0.02 - Improved error handling
-- Revision 0.03 - Added handling of broadcast address
-- Additional Comments:
--
----------------------------------------------------------------------------------
60,6 → 61,8
signal rx_state : rx_state_type;
signal rx_count : unsigned (15 downto 0);
signal src_ip : std_logic_vector (31 downto 0); -- src IP captured from input
signal dst_ip : std_logic_vector (23 downto 0); -- 1st 3 bytes of dst IP captured from input
signal is_broadcast_reg : std_logic;
signal protocol : std_logic_vector (7 downto 0); -- src protocol captured from input
signal data_len : std_logic_vector (15 downto 0); -- src data length captured from input
signal ip_rx_start_reg : std_logic; -- indicates start of user data
66,7 → 69,7
signal hdr_valid_reg : std_logic; -- indicates that hdr data is valid
signal frame_err_cnt : unsigned (7 downto 0); -- number of frame errors
signal error_code_reg : std_logic_vector (3 downto 0);
signal rx_pkt_counter : unsigned (7 downto 0); -- number of rx frames received for us
signal rx_pkt_counter : unsigned (7 downto 0); -- number of rx frames received for us
-- rx control signals
signal next_rx_state : rx_state_type;
73,6 → 76,9
signal set_rx_state : std_logic;
signal rx_event : rx_event_type;
signal rx_count_mode : settable_count_mode_type;
signal set_dst_ip3 : std_logic;
signal set_dst_ip2 : std_logic;
signal set_dst_ip1 : std_logic;
signal set_ip3 : std_logic;
signal set_ip2 : std_logic;
signal set_ip1 : std_logic;
89,6 → 95,8
signal error_code_val : std_logic_vector (3 downto 0);
signal set_pkt_cnt : count_mode_type;
signal set_data_last : std_logic;
signal dst_ip_rx : std_logic_vector (31 downto 0);
signal set_is_broadcast : set_clr_type;
 
 
-- IP datagram header format
132,12 → 140,14
-- input signals
mac_data_in, mac_data_in_valid, mac_data_in_last, our_ip_address,
-- state variables
rx_state, rx_count, src_ip, protocol, data_len, ip_rx_start_reg, hdr_valid_reg, frame_err_cnt, error_code_reg, rx_pkt_counter,
rx_state, rx_count, src_ip, dst_ip, protocol, data_len, ip_rx_start_reg, hdr_valid_reg,
frame_err_cnt, error_code_reg, rx_pkt_counter, is_broadcast_reg,
-- control signals
next_rx_state, set_rx_state, rx_event, rx_count_mode,
set_ip3, set_ip2, set_ip1, set_ip0, set_protocol, set_len_H, set_len_L,
set_dst_ip3, set_dst_ip2, set_dst_ip1,
set_ip_rx_start, set_hdr_valid, set_frame_err_cnt, dataval, rx_count_val,
set_error_code, error_code_val, set_pkt_cnt, set_data_last
set_error_code, error_code_val, set_pkt_cnt, set_data_last, dst_ip_rx, set_is_broadcast
)
begin
-- set output followers
148,6 → 158,7
ip_rx.hdr.src_ip_addr <= src_ip;
ip_rx.hdr.num_frame_errors <= std_logic_vector(frame_err_cnt);
ip_rx.hdr.last_error_code <= error_code_reg;
ip_rx.hdr.is_broadcast <= is_broadcast_reg;
rx_pkt_count <= STD_LOGIC_VECTOR(rx_pkt_counter);
-- transfer data upstream if in user data phase
170,6 → 181,9
set_ip2 <= '0';
set_ip1 <= '0';
set_ip0 <= '0';
set_dst_ip3 <= '0';
set_dst_ip2 <= '0';
set_dst_ip1 <= '0';
set_protocol <= '0';
set_len_H <= '0';
set_len_L <= '0';
182,6 → 196,8
set_pkt_cnt <= HOLD;
dataval <= (others => '0');
set_data_last <= '0';
dst_ip_rx <= (others => '0');
set_is_broadcast <= HOLD;
-- determine event (if any)
if mac_data_in_valid = '1' then
289,37 → 305,32
when x"000c" => set_ip3 <= '1';
when x"000d" => set_ip2 <= '1';
when x"000e" => set_ip1 <= '1';
when x"000f" => set_ip0 <= '1'; set_hdr_valid <= SET; -- header values are now valid, although the pkt may not be for us
when x"000f" => set_ip0 <= '1';
 
when x"0010" =>
if mac_data_in /= our_ip_address(31 downto 24) then -- ignore pkts that are not addressed to us
next_rx_state <= WAIT_END;
set_rx_state <= '1';
end if;
 
when x"0011" =>
if mac_data_in /= our_ip_address(23 downto 16) then -- ignore pkts that are not addressed to us
next_rx_state <= WAIT_END;
set_rx_state <= '1';
end if;
 
when x"0012" =>
if mac_data_in /= our_ip_address(15 downto 8) then -- ignore pkts that are not addressed to us
next_rx_state <= WAIT_END;
set_rx_state <= '1';
end if;
 
when x"0010" => set_dst_ip3 <= '1';
when x"0011" => set_dst_ip2 <= '1';
when x"0012" => set_dst_ip1 <= '1';
when x"0013" =>
if mac_data_in /= our_ip_address(7 downto 0) then -- ignore pkts that are not addressed to us
next_rx_state <= WAIT_END;
set_rx_state <= '1';
-- now have the dst IP addr
dst_ip_rx <= dst_ip & mac_data_in;
if dst_ip_rx = IP_BC_ADDR then
set_is_broadcast <= SET;
else
set_is_broadcast <= CLR;
end if;
set_hdr_valid <= SET; -- header values are now valid, although the pkt may not be for us
if dst_ip_rx = our_ip_address or dst_ip_rx = IP_BC_ADDR then
next_rx_state <= USER_DATA;
set_pkt_cnt <= INCR; -- count another pkt
set_pkt_cnt <= INCR; -- count another pkt received
set_rx_state <= '1';
set_ip_rx_start <= SET;
else
next_rx_state <= WAIT_END;
set_rx_state <= '1';
end if;
when others => -- ignore other bytes in ip header
end case;
end if;
397,10 → 408,12
rx_state <= IDLE;
rx_count <= x"0000";
src_ip <= (others => '0');
dst_ip <= (others => '0');
protocol <= (others => '0');
data_len <= (others => '0');
ip_rx_start_reg <= '0';
hdr_valid_reg <= '0';
is_broadcast_reg <= '0';
frame_err_cnt <= (others => '0');
error_code_reg <= RX_EC_NONE;
rx_pkt_counter <= x"00";
441,6 → 454,11
if (set_ip1 = '1') then src_ip(15 downto 8) <= dataval; end if;
if (set_ip0 = '1') then src_ip(7 downto 0) <= dataval; end if;
 
-- dst ip capture
if (set_dst_ip3 = '1') then dst_ip(23 downto 16) <= dataval; end if;
if (set_dst_ip2 = '1') then dst_ip(15 downto 8) <= dataval; end if;
if (set_dst_ip1 = '1') then dst_ip(7 downto 0) <= dataval; end if;
 
if (set_protocol = '1') then
protocol <= dataval;
else
462,6 → 480,12
when CLR => ip_rx_start_reg <= '0';
when HOLD => ip_rx_start_reg <= ip_rx_start_reg;
end case;
 
case set_is_broadcast is
when SET => is_broadcast_reg <= '1';
when CLR => is_broadcast_reg <= '0';
when HOLD => is_broadcast_reg <= is_broadcast_reg;
end case;
case set_hdr_valid is
when SET => hdr_valid_reg <= '1';
/IPv4_TX.vhd
19,6 → 19,7
-- Revision 0.01 - File Created
-- Revision 0.02 - fixed up setting of tx_result control defaults
-- Revision 0.03 - Added data_out_first
-- Revision 0.04 - Added handling of broadcast address
-- Additional Comments:
--
----------------------------------------------------------------------------------
75,7 → 76,7
-- Configuration
constant IP_TTL : std_logic_vector (7 downto 0) := x"80";
constant IP_TTL : std_logic_vector (7 downto 0) := x"80";
 
-- TX state variables
signal tx_state : tx_state_type;
94,6 → 95,7
signal set_tx_state : std_logic;
signal next_tx_result : std_logic_vector (1 downto 0);
signal set_tx_result : std_logic;
signal tx_mac_value : std_logic_vector (47 downto 0);
signal set_tx_mac : std_logic;
signal tx_count_val : unsigned (11 downto 0);
signal tx_count_mode : settable_cnt_type;
163,7 → 165,7
tx_state, tx_count, tx_result_reg, tx_mac, tx_mac_chn_reqd,
mac_lookup_req, tx_hdr_cks, arp_req_ip_reg, mac_data_out_ready_reg,
-- control signals
next_tx_state, set_tx_state, next_tx_result, set_tx_result, set_tx_mac, tx_count_mode,
next_tx_state, set_tx_state, next_tx_result, set_tx_result, tx_mac_value, set_tx_mac, tx_count_mode,
tx_data, set_last, set_chn_reqd, set_mac_lku_req, total_length,
tx_data_valid, tx_count_val
)
208,6 → 210,7
next_tx_result <= IPTX_RESULT_NONE;
set_tx_result <= '0';
tx_count_val <= (others => '0');
tx_mac_value <= (others => '0');
-- set temp signals
total_length <= std_logic_vector(unsigned(ip_tx.hdr.data_length) + 20); -- total length = user data length + header length (bytes)
224,14 → 227,23
next_tx_result <= IPTX_RESULT_ERR;
set_tx_result <= '1';
else
next_tx_result <= IPTX_RESULT_SENDING;
set_tx_result <= '1';
-- TODO - check if we already have the mac addr for this ip, if so, bypass the WAIT_MAC state
-- req the mac address for this ip
set_mac_lku_req <= SET;
next_tx_result <= IPTX_RESULT_SENDING;
set_tx_result <= '1';
next_tx_state <= WAIT_MAC;
set_tx_state <= '1';
if ip_tx.hdr.dst_ip_addr = IP_BC_ADDR then
-- for IP broadcast, dont need to look up the MAC addr
tx_mac_value <= MAC_BC_ADDR;
set_tx_mac <= '1';
next_tx_state <= WAIT_CHN;
set_tx_state <= '1';
else
-- need to req the mac address for this ip
set_mac_lku_req <= SET;
next_tx_state <= WAIT_MAC;
set_tx_state <= '1';
end if;
end if;
else
set_mac_lku_req <= CLR;
241,6 → 253,7
ip_tx_data_out_ready <= '0'; -- in this state, we are unable to accept user data for tx
if arp_req_rslt.got_mac = '1' then
-- save the MAC we got back from the ARP lookup
tx_mac_value <= arp_req_rslt.mac;
set_tx_mac <= '1';
set_chn_reqd <= SET;
set_mac_lku_req <= CLR;
425,7 → 438,7
-- save MAC
if set_tx_mac = '1' then
tx_mac <= arp_req_rslt.mac;
tx_mac <= tx_mac_value;
else
tx_mac <= tx_mac;
end if;

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