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Rework IP modules

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This commit is contained in:
Alex Forencich 2014-11-20 12:11:11 -08:00
parent d1b6e69079
commit fc6ccd97fb
2 changed files with 47 additions and 148 deletions
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97
rtl/ip.v
View File

@ -135,41 +135,10 @@ module ip
input wire [31:0] local_ip
);
/*
IP Frame
Field Length
Destination MAC address 6 octets
Source MAC address 6 octets
Ethertype (0x0800) 2 octets
Version (4) 4 bits
IHL (5-15) 4 bits
DSCP (0) 6 bits
ECN (0) 2 bits
length 2 octets
identification (0?) 2 octets
flags (010) 3 bits
fragment offset (0) 13 bits
time to live (64?) 1 octet
protocol 1 octet
header checksum 2 octets
source IP 4 octets
destination IP 4 octets
options (IHL-5)*4 octets
payload length octets
This module receives an Ethernet frame with decoded fields and decodes
the AXI packet format. If the Ethertype does not match, the packet is
discarded.
*/
localparam [1:0]
STATE_IDLE = 2'd0,
STATE_ARP_QUERY = 2'd1,
STATE_SEND_PACKET = 2'd2,
STATE_DROP_PACKET = 2'd3;
STATE_WAIT_PACKET = 2'd2;
reg [1:0] state_reg = STATE_IDLE, state_next;
@ -271,9 +240,9 @@ ip_eth_tx_inst (
reg input_ip_hdr_ready_reg = 0, input_ip_hdr_ready_next;
reg arp_request_valid_reg = 0;
reg arp_request_valid_reg = 0, arp_request_valid_next;
reg drop_packet_reg = 0;
reg drop_packet_reg = 0, drop_packet_next;
assign input_ip_hdr_ready = input_ip_hdr_ready_reg;
assign input_ip_payload_tready = outgoing_ip_payload_tready | drop_packet_reg;
@ -286,6 +255,9 @@ assign tx_error_arp_failed = arp_response_error;
always @* begin
state_next = 8'bz;
arp_request_valid_next = 0;
drop_packet_next = 0;
input_ip_hdr_ready_next = 0;
outgoing_ip_hdr_valid_next = outgoing_ip_hdr_valid_reg & ~outgoing_ip_hdr_ready;
@ -296,43 +268,43 @@ always @* begin
// wait for outgoing packet
if (input_ip_hdr_valid) begin
// initiate ARP request
arp_request_valid_next = 1;
state_next = STATE_ARP_QUERY;
end else begin
state_next = STATE_IDLE;
end
end
STATE_ARP_QUERY: begin
arp_request_valid_next = 1;
if (arp_response_valid) begin
// wait for ARP reponse
if (arp_response_error) begin
// did not get MAC address; drop packet
input_ip_hdr_ready_next = 1;
state_next = STATE_DROP_PACKET;
arp_request_valid_next = 0;
drop_packet_next = 1;
state_next = STATE_WAIT_PACKET;
end else begin
// got MAC address; send packet
input_ip_hdr_ready_next = 1;
arp_request_valid_next = 0;
outgoing_ip_hdr_valid_next = 1;
outgoing_eth_dest_mac_next = arp_response_mac;
state_next = STATE_SEND_PACKET;
state_next = STATE_WAIT_PACKET;
end
end else begin
state_next = STATE_ARP_QUERY;
end
end
STATE_SEND_PACKET: begin
STATE_WAIT_PACKET: begin
drop_packet_next = drop_packet_reg;
// wait for packet transfer to complete
if (input_ip_payload_tlast & input_ip_payload_tvalid) begin
if (input_ip_payload_tlast & input_ip_payload_tready & input_ip_payload_tvalid) begin
state_next = STATE_IDLE;
end else begin
state_next = STATE_SEND_PACKET;
end
end
STATE_DROP_PACKET: begin
// wait for packet transfer to complete
if (input_ip_payload_tlast & input_ip_payload_tvalid) begin
state_next = STATE_IDLE;
end else begin
state_next = STATE_DROP_PACKET;
state_next = STATE_WAIT_PACKET;
end
end
endcase
@ -342,43 +314,20 @@ always @(posedge clk or posedge rst) begin
if (rst) begin
state_reg <= STATE_IDLE;
arp_request_valid_reg <= 0;
drop_packet_reg <= 0;
input_ip_hdr_ready_reg <= 0;
outgoing_ip_hdr_valid_reg <= 1'b0;
outgoing_eth_dest_mac_reg <= 48'h000000000000;
drop_packet_reg <= 0;
end else begin
state_reg <= state_next;
arp_request_valid_reg <= arp_request_valid_next;
drop_packet_reg <= drop_packet_next;
input_ip_hdr_ready_reg <= input_ip_hdr_ready_next;
outgoing_ip_hdr_valid_reg <= outgoing_ip_hdr_valid_next;
outgoing_eth_dest_mac_reg <= outgoing_eth_dest_mac_next;
// generate valid outputs
case (state_next)
STATE_IDLE: begin
// idle; wait for IP packet
arp_request_valid_reg <= 0;
drop_packet_reg <= 0;
end
STATE_ARP_QUERY: begin
// wait for ARP reponse
arp_request_valid_reg <= 1;
drop_packet_reg <= 0;
end
STATE_SEND_PACKET: begin
// wait for packet transfer to complete
arp_request_valid_reg <= 0;
drop_packet_reg <= 0;
end
STATE_DROP_PACKET: begin
// wait for packet transfer to complete
arp_request_valid_reg <= 0;
drop_packet_reg <= 1;
end
endcase
end
end

98
rtl/ip_64.v
View File

@ -139,41 +139,10 @@ module ip_64
input wire [31:0] local_ip
);
/*
IP Frame
Field Length
Destination MAC address 6 octets
Source MAC address 6 octets
Ethertype (0x0800) 2 octets
Version (4) 4 bits
IHL (5-15) 4 bits
DSCP (0) 6 bits
ECN (0) 2 bits
length 2 octets
identification (0?) 2 octets
flags (010) 3 bits
fragment offset (0) 13 bits
time to live (64?) 1 octet
protocol 1 octet
header checksum 2 octets
source IP 4 octets
destination IP 4 octets
options (IHL-5)*4 octets
payload length octets
This module receives an Ethernet frame with decoded fields and decodes
the AXI packet format. If the Ethertype does not match, the packet is
discarded.
*/
localparam [1:0]
STATE_IDLE = 2'd0,
STATE_ARP_QUERY = 2'd1,
STATE_SEND_PACKET = 2'd2,
STATE_DROP_PACKET = 2'd3;
STATE_WAIT_PACKET = 2'd2;
reg [1:0] state_reg = STATE_IDLE, state_next;
@ -277,11 +246,12 @@ ip_eth_tx_64_inst (
.error_payload_early_termination(tx_error_payload_early_termination)
);
reg input_ip_hdr_ready_reg = 0, input_ip_hdr_ready_next;
reg arp_request_valid_reg = 0;
reg arp_request_valid_reg = 0, arp_request_valid_next;
reg drop_packet_reg = 0;
reg drop_packet_reg = 0, drop_packet_next;
assign input_ip_hdr_ready = input_ip_hdr_ready_reg;
assign input_ip_payload_tready = outgoing_ip_payload_tready | drop_packet_reg;
@ -294,6 +264,9 @@ assign tx_error_arp_failed = arp_response_error;
always @* begin
state_next = 8'bz;
arp_request_valid_next = 0;
drop_packet_next = 0;
input_ip_hdr_ready_next = 0;
outgoing_ip_hdr_valid_next = outgoing_ip_hdr_valid_reg & ~outgoing_ip_hdr_ready;
@ -304,43 +277,43 @@ always @* begin
// wait for outgoing packet
if (input_ip_hdr_valid) begin
// initiate ARP request
arp_request_valid_next = 1;
state_next = STATE_ARP_QUERY;
end else begin
state_next = STATE_IDLE;
end
end
STATE_ARP_QUERY: begin
arp_request_valid_next = 1;
if (arp_response_valid) begin
// wait for ARP reponse
if (arp_response_error) begin
// did not get MAC address; drop packet
input_ip_hdr_ready_next = 1;
state_next = STATE_DROP_PACKET;
arp_request_valid_next = 0;
drop_packet_next = 1;
state_next = STATE_WAIT_PACKET;
end else begin
// got MAC address; send packet
input_ip_hdr_ready_next = 1;
arp_request_valid_next = 0;
outgoing_ip_hdr_valid_next = 1;
outgoing_eth_dest_mac_next = arp_response_mac;
state_next = STATE_SEND_PACKET;
state_next = STATE_WAIT_PACKET;
end
end else begin
state_next = STATE_ARP_QUERY;
end
end
STATE_SEND_PACKET: begin
STATE_WAIT_PACKET: begin
drop_packet_next = drop_packet_reg;
// wait for packet transfer to complete
if (input_ip_payload_tlast & input_ip_payload_tvalid) begin
if (input_ip_payload_tlast & input_ip_payload_tready & input_ip_payload_tvalid) begin
state_next = STATE_IDLE;
end else begin
state_next = STATE_SEND_PACKET;
end
end
STATE_DROP_PACKET: begin
// wait for packet transfer to complete
if (input_ip_payload_tlast & input_ip_payload_tvalid) begin
state_next = STATE_IDLE;
end else begin
state_next = STATE_DROP_PACKET;
state_next = STATE_WAIT_PACKET;
end
end
endcase
@ -350,43 +323,20 @@ always @(posedge clk or posedge rst) begin
if (rst) begin
state_reg <= STATE_IDLE;
arp_request_valid_reg <= 0;
drop_packet_reg <= 0;
input_ip_hdr_ready_reg <= 0;
outgoing_ip_hdr_valid_reg <= 1'b0;
outgoing_eth_dest_mac_reg <= 48'h000000000000;
drop_packet_reg <= 0;
end else begin
state_reg <= state_next;
arp_request_valid_reg <= arp_request_valid_next;
drop_packet_reg <= drop_packet_next;
input_ip_hdr_ready_reg <= input_ip_hdr_ready_next;
outgoing_ip_hdr_valid_reg <= outgoing_ip_hdr_valid_next;
outgoing_eth_dest_mac_reg <= outgoing_eth_dest_mac_next;
// generate valid outputs
case (state_next)
STATE_IDLE: begin
// idle; wait for IP packet
arp_request_valid_reg <= 0;
drop_packet_reg <= 0;
end
STATE_ARP_QUERY: begin
// wait for ARP reponse
arp_request_valid_reg <= 1;
drop_packet_reg <= 0;
end
STATE_SEND_PACKET: begin
// wait for packet transfer to complete
arp_request_valid_reg <= 0;
drop_packet_reg <= 0;
end
STATE_DROP_PACKET: begin
// wait for packet transfer to complete
arp_request_valid_reg <= 0;
drop_packet_reg <= 1;
end
endcase
end
end