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Add ARP module and testbench

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Alex Forencich 2014-11-20 22:55:28 -08:00
parent 7fdb7b4f35
commit 2ae3581144
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/*
Copyright (c) 2014 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Language: Verilog 2001
`timescale 1ns / 1ps
/*
* ARP block for IPv4, ethernet frame interface
*/
module arp #(
parameter CACHE_ADDR_WIDTH = 2,
parameter REQUEST_RETRY_COUNT = 4,
parameter REQUEST_RETRY_INTERVAL = 125000000*2,
parameter REQUEST_TIMEOUT = 125000000*30
)
(
input wire clk,
input wire rst,
/*
* Ethernet frame input
*/
input wire input_eth_hdr_valid,
output wire input_eth_hdr_ready,
input wire [47:0] input_eth_dest_mac,
input wire [47:0] input_eth_src_mac,
input wire [15:0] input_eth_type,
input wire [7:0] input_eth_payload_tdata,
input wire input_eth_payload_tvalid,
output wire input_eth_payload_tready,
input wire input_eth_payload_tlast,
input wire input_eth_payload_tuser,
/*
* Ethernet frame output
*/
output wire output_eth_hdr_valid,
input wire output_eth_hdr_ready,
output wire [47:0] output_eth_dest_mac,
output wire [47:0] output_eth_src_mac,
output wire [15:0] output_eth_type,
output wire [7:0] output_eth_payload_tdata,
output wire output_eth_payload_tvalid,
input wire output_eth_payload_tready,
output wire output_eth_payload_tlast,
output wire output_eth_payload_tuser,
/*
* ARP requests
*/
input wire arp_request_valid,
input wire [31:0] arp_request_ip,
output wire arp_response_valid,
output wire arp_response_error,
output wire [47:0] arp_response_mac,
/*
* Configuration
*/
input wire [47:0] local_mac,
input wire [31:0] local_ip,
input wire [31:0] gateway_ip,
input wire [31:0] subnet_mask,
input wire clear_cache
);
localparam [15:0]
ARP_OPER_ARP_REQUEST = 16'h0001,
ARP_OPER_ARP_REPLY = 16'h0002,
ARP_OPER_INARP_REQUEST = 16'h0008,
ARP_OPER_INARP_REPLY = 16'h0009;
wire incoming_frame_valid;
wire incoming_frame_ready;
wire [47:0] incoming_eth_dest_mac;
wire [47:0] incoming_eth_src_mac;
wire [15:0] incoming_eth_type;
wire [15:0] incoming_arp_htype;
wire [15:0] incoming_arp_ptype;
wire [7:0] incoming_arp_hlen;
wire [7:0] incoming_arp_plen;
wire [15:0] incoming_arp_oper;
wire [47:0] incoming_arp_sha;
wire [31:0] incoming_arp_spa;
wire [47:0] incoming_arp_tha;
wire [31:0] incoming_arp_tpa;
reg outgoing_frame_valid_reg = 0, outgoing_frame_valid_next;
wire outgoing_frame_ready;
reg [47:0] outgoing_eth_dest_mac_reg = 0, outgoing_eth_dest_mac_next;
reg [15:0] outgoing_arp_oper_reg = 0, outgoing_arp_oper_next;
reg [47:0] outgoing_arp_tha_reg = 0, outgoing_arp_tha_next;
reg [31:0] outgoing_arp_tpa_reg = 0, outgoing_arp_tpa_next;
// drop frame
reg drop_incoming_frame_reg = 0, drop_incoming_frame_next;
// wait on incoming frames until we can reply
assign incoming_frame_ready = outgoing_frame_ready | drop_incoming_frame_reg;
/*
* ARP frame processing
*/
arp_eth_rx
arp_eth_rx_inst (
.clk(clk),
.rst(rst),
// Ethernet frame input
.input_eth_hdr_valid(input_eth_hdr_valid),
.input_eth_hdr_ready(input_eth_hdr_ready),
.input_eth_dest_mac(input_eth_dest_mac),
.input_eth_src_mac(input_eth_src_mac),
.input_eth_type(input_eth_type),
.input_eth_payload_tdata(input_eth_payload_tdata),
.input_eth_payload_tvalid(input_eth_payload_tvalid),
.input_eth_payload_tready(input_eth_payload_tready),
.input_eth_payload_tlast(input_eth_payload_tlast),
.input_eth_payload_tuser(input_eth_payload_tuser),
// ARP frame output
.output_frame_valid(incoming_frame_valid),
.output_frame_ready(incoming_frame_ready),
.output_eth_dest_mac(incoming_eth_dest_mac),
.output_eth_src_mac(incoming_eth_src_mac),
.output_eth_type(incoming_eth_type),
.output_arp_htype(incoming_arp_htype),
.output_arp_ptype(incoming_arp_ptype),
.output_arp_hlen(incoming_arp_hlen),
.output_arp_plen(incoming_arp_plen),
.output_arp_oper(incoming_arp_oper),
.output_arp_sha(incoming_arp_sha),
.output_arp_spa(incoming_arp_spa),
.output_arp_tha(incoming_arp_tha),
.output_arp_tpa(incoming_arp_tpa),
// Status signals
.busy(),
.error_header_early_termination(),
.error_invalid_header()
);
arp_eth_tx
arp_eth_tx_inst (
.clk(clk),
.rst(rst),
// ARP frame input
.input_frame_valid(outgoing_frame_valid_reg),
.input_frame_ready(outgoing_frame_ready),
.input_eth_dest_mac(outgoing_eth_dest_mac_reg),
.input_eth_src_mac(local_mac),
.input_eth_type(16'h0806),
.input_arp_htype(16'h0001),
.input_arp_ptype(16'h0800),
.input_arp_oper(outgoing_arp_oper_reg),
.input_arp_sha(local_mac),
.input_arp_spa(local_ip),
.input_arp_tha(outgoing_arp_tha_reg),
.input_arp_tpa(outgoing_arp_tpa_reg),
// Ethernet frame output
.output_eth_hdr_valid(output_eth_hdr_valid),
.output_eth_hdr_ready(output_eth_hdr_ready),
.output_eth_dest_mac(output_eth_dest_mac),
.output_eth_src_mac(output_eth_src_mac),
.output_eth_type(output_eth_type),
.output_eth_payload_tdata(output_eth_payload_tdata),
.output_eth_payload_tvalid(output_eth_payload_tvalid),
.output_eth_payload_tready(output_eth_payload_tready),
.output_eth_payload_tlast(output_eth_payload_tlast),
.output_eth_payload_tuser(output_eth_payload_tuser),
// Status signals
.busy()
);
wire incoming_eth_type_valid = (incoming_eth_type == 16'h0806);
wire incoming_arp_htype_valid = (incoming_arp_htype == 16'h0001);
wire incoming_arp_ptype_valid = (incoming_arp_ptype == 16'h0800);
wire incoming_arp_oper_arp_request = (incoming_arp_oper == ARP_OPER_ARP_REQUEST);
wire incoming_arp_oper_arp_reply = (incoming_arp_oper == ARP_OPER_ARP_REPLY);
wire incoming_arp_oper_inarp_request = (incoming_arp_oper == ARP_OPER_INARP_REQUEST);
wire incoming_arp_oper_inarp_reply = (incoming_arp_oper == ARP_OPER_INARP_REPLY);
wire filtered_incoming_frame_valid = incoming_frame_valid &
incoming_eth_type_valid &
incoming_arp_htype_valid &
incoming_arp_ptype_valid;
wire filtered_incoming_arp_oper_arp_request = filtered_incoming_frame_valid & incoming_arp_oper_arp_request;
wire filtered_incoming_arp_oper_arp_reply = filtered_incoming_frame_valid & incoming_arp_oper_arp_reply;
wire filtered_incoming_arp_oper_inarp_request = filtered_incoming_frame_valid & incoming_arp_oper_inarp_request;
wire filtered_incoming_arp_oper_inarp_reply = filtered_incoming_frame_valid & incoming_arp_oper_inarp_reply;
wire cache_query_request_valid;
wire [31:0] cache_query_request_ip;
wire cache_query_response_valid;
wire cache_query_response_error;
wire [47:0] cache_query_response_mac;
reg cache_write_request_valid_reg = 0, cache_write_request_valid_next;
reg [31:0] cache_write_request_ip_reg = 0, cache_write_request_ip_next;
reg [47:0] cache_write_request_mac_reg = 0, cache_write_request_mac_next;
wire cache_write_in_progress;
wire cache_write_complete;
/*
* ARP cache
*/
arp_cache #(
.CACHE_ADDR_WIDTH(CACHE_ADDR_WIDTH)
)
arp_cache_inst (
.clk(clk),
.rst(rst),
// Query cache
.query_request_valid(cache_query_request_valid),
.query_request_ip(cache_query_request_ip),
.query_response_valid(cache_query_response_valid),
.query_response_error(cache_query_response_error),
.query_response_mac(cache_query_response_mac),
// Write cache
.write_request_valid(cache_write_request_valid_reg),
.write_request_ip(cache_write_request_ip_reg),
.write_request_mac(cache_write_request_mac_reg),
.write_in_progress(cache_write_in_progress),
.write_complete(cache_write_complete),
// Configuration
.clear_cache(clear_cache)
);
reg arp_request_operation_reg = 0, arp_request_operation_next;
reg arp_request_valid_reg = 0, arp_request_valid_next;
reg [31:0] arp_request_ip_reg = 0, arp_request_ip_next;
reg arp_response_error_reg = 0, arp_response_error_next;
reg arp_response_broadcast_reg = 0, arp_response_broadcast_next;
reg [5:0] arp_request_retry_cnt_reg = 0, arp_request_retry_cnt_next;
reg [35:0] arp_request_timer_reg = 0, arp_request_timer_next;
assign cache_query_request_valid = ~arp_request_operation_reg ? arp_request_valid_reg : 1'b1;
assign cache_query_request_ip = arp_request_ip_reg;
assign arp_response_valid = arp_response_error_reg | (cache_query_response_valid & ~cache_query_response_error & ~arp_request_operation_reg) | arp_response_broadcast_reg;
assign arp_response_error = arp_response_error_reg;
assign arp_response_mac = arp_response_broadcast_reg ? 48'hffffffffffff : cache_query_response_mac;
always @* begin
outgoing_frame_valid_next = outgoing_frame_valid_reg & ~outgoing_frame_ready;
outgoing_eth_dest_mac_next = outgoing_eth_dest_mac_reg;
outgoing_arp_oper_next = outgoing_arp_oper_reg;
outgoing_arp_tha_next = outgoing_arp_tha_reg;
outgoing_arp_tpa_next = outgoing_arp_tpa_reg;
cache_write_request_valid_next = 0;
cache_write_request_mac_next = 0;
cache_write_request_ip_next = 0;
arp_request_valid_next = 0;
arp_request_ip_next = arp_request_ip_reg;
arp_request_operation_next = arp_request_operation_reg;
arp_request_retry_cnt_next = arp_request_retry_cnt_reg;
arp_request_timer_next = arp_request_timer_reg;
arp_response_error_next = 0;
arp_response_broadcast_next = 0;
drop_incoming_frame_next = 0;
// manage incoming frames
if (filtered_incoming_frame_valid & ~(outgoing_frame_valid_reg & ~outgoing_frame_ready)) begin
// store sender addresses in cache
cache_write_request_valid_next = 1;
cache_write_request_ip_next = incoming_arp_spa;
cache_write_request_mac_next = incoming_arp_sha;
if (incoming_arp_oper_arp_request) begin
if (incoming_arp_tpa == local_ip) begin
// send reply frame to valid incoming request
outgoing_frame_valid_next = 1;
outgoing_eth_dest_mac_next = incoming_eth_src_mac;
outgoing_arp_oper_next = ARP_OPER_ARP_REPLY;
outgoing_arp_tha_next = incoming_arp_sha;
outgoing_arp_tpa_next = incoming_arp_spa;
end else begin
// does not match -> drop it
drop_incoming_frame_next = 1;
end
end else if (incoming_arp_oper_inarp_request) begin
if (incoming_arp_tha == local_mac) begin
// send reply frame to valid incoming request
outgoing_frame_valid_next = 1;
outgoing_eth_dest_mac_next = incoming_eth_src_mac;
outgoing_arp_oper_next = ARP_OPER_INARP_REPLY;
outgoing_arp_tha_next = incoming_arp_sha;
outgoing_arp_tpa_next = incoming_arp_spa;
end else begin
// does not match -> drop it
drop_incoming_frame_next = 1;
end
end else begin
// does not match -> drop it
drop_incoming_frame_next = 1;
end
end else if (incoming_frame_valid & ~filtered_incoming_frame_valid) begin
// incoming invalid frame -> drop it
drop_incoming_frame_next = 1;
end
// manage ARP lookup requests
if (~arp_request_operation_reg) begin
if (arp_request_valid) begin
if (~(arp_request_ip | subnet_mask) == 0) begin
// broadcast address
// (all bits in request IP set where subnet mask is clear)
arp_request_valid_next = 0;
arp_response_broadcast_next = 1;
end else if (((arp_request_ip ^ gateway_ip) & subnet_mask) == 0) begin
// within subnet, look up IP directly
// (no bits differ between request IP and gateway IP where subnet mask is set)
arp_request_valid_next = 1;
arp_request_ip_next = arp_request_ip;
end else begin
// outside of subnet, so look up gateway address
arp_request_valid_next = 1;
arp_request_ip_next = gateway_ip;
end
end
if (cache_query_response_error & ~arp_response_error) begin
arp_request_operation_next = 1;
// send ARP request frame
outgoing_frame_valid_next = 1;
outgoing_eth_dest_mac_next = 48'hFF_FF_FF_FF_FF_FF;
outgoing_arp_oper_next = ARP_OPER_ARP_REQUEST;
outgoing_arp_tha_next = 48'h00_00_00_00_00_00;
outgoing_arp_tpa_next = arp_request_ip_reg;
arp_request_retry_cnt_next = REQUEST_RETRY_COUNT-1;
arp_request_timer_next = REQUEST_RETRY_INTERVAL;
end
end else begin
arp_request_timer_next = arp_request_timer_reg - 1;
// if we got a response, it will go in the cache, so when the query succeds, we're done
if (cache_query_response_valid & ~cache_query_response_error) begin
arp_request_operation_next = 0;
end
// timer timeout
if (arp_request_timer_reg == 0) begin
if (arp_request_retry_cnt_reg > 0) begin
// have more retries
// send ARP request frame
outgoing_frame_valid_next = 1'b1;
outgoing_eth_dest_mac_next = 48'hFF_FF_FF_FF_FF_FF;
outgoing_arp_oper_next = ARP_OPER_ARP_REQUEST;
outgoing_arp_tha_next = 48'h00_00_00_00_00_00;
outgoing_arp_tpa_next = arp_request_ip_reg;
arp_request_retry_cnt_next = arp_request_retry_cnt_reg - 1;
if (arp_request_retry_cnt_reg > 1) begin
arp_request_timer_next = REQUEST_RETRY_INTERVAL;
end else begin
arp_request_timer_next = REQUEST_TIMEOUT;
end
end else begin
// out of retries
arp_request_operation_next = 0;
arp_response_error_next = 1;
end
end
end
end
always @(posedge clk or posedge rst) begin
if (rst) begin
outgoing_frame_valid_reg <= 0;
outgoing_eth_dest_mac_reg <= 0;
outgoing_arp_oper_reg <= 0;
outgoing_arp_tha_reg <= 0;
outgoing_arp_tpa_reg <= 0;
cache_write_request_valid_reg <= 0;
cache_write_request_mac_reg <= 0;
cache_write_request_ip_reg <= 0;
arp_request_valid_reg <= 0;
arp_request_ip_reg <= 0;
arp_request_operation_reg <= 0;
arp_request_retry_cnt_reg <= 0;
arp_request_timer_reg <= 0;
arp_response_error_reg <= 0;
arp_response_broadcast_reg <= 0;
drop_incoming_frame_reg <= 0;
end else begin
outgoing_frame_valid_reg <= outgoing_frame_valid_next;
outgoing_eth_dest_mac_reg <= outgoing_eth_dest_mac_next;
outgoing_arp_oper_reg <= outgoing_arp_oper_next;
outgoing_arp_tha_reg <= outgoing_arp_tha_next;
outgoing_arp_tpa_reg <= outgoing_arp_tpa_next;
cache_write_request_valid_reg <= cache_write_request_valid_next;
cache_write_request_mac_reg <= cache_write_request_mac_next;
cache_write_request_ip_reg <= cache_write_request_ip_next;
arp_request_valid_reg <= arp_request_valid_next;
arp_request_ip_reg <= arp_request_ip_next;
arp_request_operation_reg <= arp_request_operation_next;
arp_request_retry_cnt_reg <= arp_request_retry_cnt_next;
arp_request_timer_reg <= arp_request_timer_next;
arp_response_error_reg <= arp_response_error_next;
arp_response_broadcast_reg <= arp_response_broadcast_next;
drop_incoming_frame_reg <= drop_incoming_frame_next;
end
end
endmodule

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/*
Copyright (c) 2014 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Language: Verilog 2001
`timescale 1ns / 1ps
/*
* ARP block for IPv4, ethernet frame interface (64 bit datapath)
*/
module arp_64 #(
parameter CACHE_ADDR_WIDTH = 2,
parameter REQUEST_RETRY_COUNT = 4,
parameter REQUEST_RETRY_INTERVAL = 125000000*2,
parameter REQUEST_TIMEOUT = 125000000*30
)
(
input wire clk,
input wire rst,
/*
* Ethernet frame input
*/
input wire input_eth_hdr_valid,
output wire input_eth_hdr_ready,
input wire [47:0] input_eth_dest_mac,
input wire [47:0] input_eth_src_mac,
input wire [15:0] input_eth_type,
input wire [63:0] input_eth_payload_tdata,
input wire [7:0] input_eth_payload_tkeep,
input wire input_eth_payload_tvalid,
output wire input_eth_payload_tready,
input wire input_eth_payload_tlast,
input wire input_eth_payload_tuser,
/*
* Ethernet frame output
*/
output wire output_eth_hdr_valid,
input wire output_eth_hdr_ready,
output wire [47:0] output_eth_dest_mac,
output wire [47:0] output_eth_src_mac,
output wire [15:0] output_eth_type,
output wire [63:0] output_eth_payload_tdata,
output wire [7:0] output_eth_payload_tkeep,
output wire output_eth_payload_tvalid,
input wire output_eth_payload_tready,
output wire output_eth_payload_tlast,
output wire output_eth_payload_tuser,
/*
* ARP requests
*/
input wire arp_request_valid,
input wire [31:0] arp_request_ip,
output wire arp_response_valid,
output wire arp_response_error,
output wire [47:0] arp_response_mac,
/*
* Configuration
*/
input wire [47:0] local_mac,
input wire [31:0] local_ip,
input wire [31:0] gateway_ip,
input wire [31:0] subnet_mask,
input wire clear_cache
);
localparam [15:0]
ARP_OPER_ARP_REQUEST = 16'h0001,
ARP_OPER_ARP_REPLY = 16'h0002,
ARP_OPER_INARP_REQUEST = 16'h0008,
ARP_OPER_INARP_REPLY = 16'h0009;
wire incoming_frame_valid;
wire incoming_frame_ready;
wire [47:0] incoming_eth_dest_mac;
wire [47:0] incoming_eth_src_mac;
wire [15:0] incoming_eth_type;
wire [15:0] incoming_arp_htype;
wire [15:0] incoming_arp_ptype;
wire [7:0] incoming_arp_hlen;
wire [7:0] incoming_arp_plen;
wire [15:0] incoming_arp_oper;
wire [47:0] incoming_arp_sha;
wire [31:0] incoming_arp_spa;
wire [47:0] incoming_arp_tha;
wire [31:0] incoming_arp_tpa;
reg outgoing_frame_valid_reg = 0, outgoing_frame_valid_next;
wire outgoing_frame_ready;
reg [47:0] outgoing_eth_dest_mac_reg = 0, outgoing_eth_dest_mac_next;
reg [15:0] outgoing_arp_oper_reg = 0, outgoing_arp_oper_next;
reg [47:0] outgoing_arp_tha_reg = 0, outgoing_arp_tha_next;
reg [31:0] outgoing_arp_tpa_reg = 0, outgoing_arp_tpa_next;
// drop frame
reg drop_incoming_frame_reg = 0, drop_incoming_frame_next;
// wait on incoming frames until we can reply
assign incoming_frame_ready = outgoing_frame_ready | drop_incoming_frame_reg;
/*
* ARP frame processing
*/
arp_eth_rx_64
arp_eth_rx_inst (
.clk(clk),
.rst(rst),
// Ethernet frame input
.input_eth_hdr_valid(input_eth_hdr_valid),
.input_eth_hdr_ready(input_eth_hdr_ready),
.input_eth_dest_mac(input_eth_dest_mac),
.input_eth_src_mac(input_eth_src_mac),
.input_eth_type(input_eth_type),
.input_eth_payload_tdata(input_eth_payload_tdata),
.input_eth_payload_tkeep(input_eth_payload_tkeep),
.input_eth_payload_tvalid(input_eth_payload_tvalid),
.input_eth_payload_tready(input_eth_payload_tready),
.input_eth_payload_tlast(input_eth_payload_tlast),
.input_eth_payload_tuser(input_eth_payload_tuser),
// ARP frame output
.output_frame_valid(incoming_frame_valid),
.output_frame_ready(incoming_frame_ready),
.output_eth_dest_mac(incoming_eth_dest_mac),
.output_eth_src_mac(incoming_eth_src_mac),
.output_eth_type(incoming_eth_type),
.output_arp_htype(incoming_arp_htype),
.output_arp_ptype(incoming_arp_ptype),
.output_arp_hlen(incoming_arp_hlen),
.output_arp_plen(incoming_arp_plen),
.output_arp_oper(incoming_arp_oper),
.output_arp_sha(incoming_arp_sha),
.output_arp_spa(incoming_arp_spa),
.output_arp_tha(incoming_arp_tha),
.output_arp_tpa(incoming_arp_tpa),
// Status signals
.busy(),
.error_header_early_termination(),
.error_invalid_header()
);
arp_eth_tx_64
arp_eth_tx_inst (
.clk(clk),
.rst(rst),
// ARP frame input
.input_frame_valid(outgoing_frame_valid_reg),
.input_frame_ready(outgoing_frame_ready),
.input_eth_dest_mac(outgoing_eth_dest_mac_reg),
.input_eth_src_mac(local_mac),
.input_eth_type(16'h0806),
.input_arp_htype(16'h0001),
.input_arp_ptype(16'h0800),
.input_arp_oper(outgoing_arp_oper_reg),
.input_arp_sha(local_mac),
.input_arp_spa(local_ip),
.input_arp_tha(outgoing_arp_tha_reg),
.input_arp_tpa(outgoing_arp_tpa_reg),
// Ethernet frame output
.output_eth_hdr_valid(output_eth_hdr_valid),
.output_eth_hdr_ready(output_eth_hdr_ready),
.output_eth_dest_mac(output_eth_dest_mac),
.output_eth_src_mac(output_eth_src_mac),
.output_eth_type(output_eth_type),
.output_eth_payload_tdata(output_eth_payload_tdata),
.output_eth_payload_tkeep(output_eth_payload_tkeep),
.output_eth_payload_tvalid(output_eth_payload_tvalid),
.output_eth_payload_tready(output_eth_payload_tready),
.output_eth_payload_tlast(output_eth_payload_tlast),
.output_eth_payload_tuser(output_eth_payload_tuser),
// Status signals
.busy()
);
wire incoming_eth_type_valid = (incoming_eth_type == 16'h0806);
wire incoming_arp_htype_valid = (incoming_arp_htype == 16'h0001);
wire incoming_arp_ptype_valid = (incoming_arp_ptype == 16'h0800);
wire incoming_arp_oper_arp_request = (incoming_arp_oper == ARP_OPER_ARP_REQUEST);
wire incoming_arp_oper_arp_reply = (incoming_arp_oper == ARP_OPER_ARP_REPLY);
wire incoming_arp_oper_inarp_request = (incoming_arp_oper == ARP_OPER_INARP_REQUEST);
wire incoming_arp_oper_inarp_reply = (incoming_arp_oper == ARP_OPER_INARP_REPLY);
wire filtered_incoming_frame_valid = incoming_frame_valid &
incoming_eth_type_valid &
incoming_arp_htype_valid &
incoming_arp_ptype_valid;
wire filtered_incoming_arp_oper_arp_request = filtered_incoming_frame_valid & incoming_arp_oper_arp_request;
wire filtered_incoming_arp_oper_arp_reply = filtered_incoming_frame_valid & incoming_arp_oper_arp_reply;
wire filtered_incoming_arp_oper_inarp_request = filtered_incoming_frame_valid & incoming_arp_oper_inarp_request;
wire filtered_incoming_arp_oper_inarp_reply = filtered_incoming_frame_valid & incoming_arp_oper_inarp_reply;
wire cache_query_request_valid;
wire [31:0] cache_query_request_ip;
wire cache_query_response_valid;
wire cache_query_response_error;
wire [47:0] cache_query_response_mac;
reg cache_write_request_valid_reg = 0, cache_write_request_valid_next;
reg [31:0] cache_write_request_ip_reg = 0, cache_write_request_ip_next;
reg [47:0] cache_write_request_mac_reg = 0, cache_write_request_mac_next;
wire cache_write_in_progress;
wire cache_write_complete;
/*
* ARP cache
*/
arp_cache #(
.CACHE_ADDR_WIDTH(CACHE_ADDR_WIDTH)
)
arp_cache_inst (
.clk(clk),
.rst(rst),
// Query cache
.query_request_valid(cache_query_request_valid),
.query_request_ip(cache_query_request_ip),
.query_response_valid(cache_query_response_valid),
.query_response_error(cache_query_response_error),
.query_response_mac(cache_query_response_mac),
// Write cache
.write_request_valid(cache_write_request_valid_reg),
.write_request_ip(cache_write_request_ip_reg),
.write_request_mac(cache_write_request_mac_reg),
.write_in_progress(cache_write_in_progress),
.write_complete(cache_write_complete),
// Configuration
.clear_cache(clear_cache)
);
reg arp_request_operation_reg = 0, arp_request_operation_next;
reg arp_request_valid_reg = 0, arp_request_valid_next;
reg [31:0] arp_request_ip_reg = 0, arp_request_ip_next;
reg arp_response_error_reg = 0, arp_response_error_next;
reg arp_response_broadcast_reg = 0, arp_response_broadcast_next;
reg [5:0] arp_request_retry_cnt_reg = 0, arp_request_retry_cnt_next;
reg [35:0] arp_request_timer_reg = 0, arp_request_timer_next;
assign cache_query_request_valid = ~arp_request_operation_reg ? arp_request_valid_reg : 1'b1;
assign cache_query_request_ip = arp_request_ip_reg;
assign arp_response_valid = arp_response_error_reg | (cache_query_response_valid & ~cache_query_response_error & ~arp_request_operation_reg) | arp_response_broadcast_reg;
assign arp_response_error = arp_response_error_reg;
assign arp_response_mac = arp_response_broadcast_reg ? 48'hffffffffffff : cache_query_response_mac;
always @* begin
outgoing_frame_valid_next = outgoing_frame_valid_reg & ~outgoing_frame_ready;
outgoing_eth_dest_mac_next = outgoing_eth_dest_mac_reg;
outgoing_arp_oper_next = outgoing_arp_oper_reg;
outgoing_arp_tha_next = outgoing_arp_tha_reg;
outgoing_arp_tpa_next = outgoing_arp_tpa_reg;
cache_write_request_valid_next = 0;
cache_write_request_mac_next = 0;
cache_write_request_ip_next = 0;
arp_request_valid_next = 0;
arp_request_ip_next = arp_request_ip_reg;
arp_request_operation_next = arp_request_operation_reg;
arp_request_retry_cnt_next = arp_request_retry_cnt_reg;
arp_request_timer_next = arp_request_timer_reg;
arp_response_error_next = 0;
arp_response_broadcast_next = 0;
drop_incoming_frame_next = 0;
// manage incoming frames
if (filtered_incoming_frame_valid & ~(outgoing_frame_valid_reg & ~outgoing_frame_ready)) begin
// store sender addresses in cache
cache_write_request_valid_next = 1;
cache_write_request_ip_next = incoming_arp_spa;
cache_write_request_mac_next = incoming_arp_sha;
if (incoming_arp_oper_arp_request) begin
if (incoming_arp_tpa == local_ip) begin
// send reply frame to valid incoming request
outgoing_frame_valid_next = 1;
outgoing_eth_dest_mac_next = incoming_eth_src_mac;
outgoing_arp_oper_next = ARP_OPER_ARP_REPLY;
outgoing_arp_tha_next = incoming_arp_sha;
outgoing_arp_tpa_next = incoming_arp_spa;
end else begin
// does not match -> drop it
drop_incoming_frame_next = 1;
end
end else if (incoming_arp_oper_inarp_request) begin
if (incoming_arp_tha == local_mac) begin
// send reply frame to valid incoming request
outgoing_frame_valid_next = 1;
outgoing_eth_dest_mac_next = incoming_eth_src_mac;
outgoing_arp_oper_next = ARP_OPER_INARP_REPLY;
outgoing_arp_tha_next = incoming_arp_sha;
outgoing_arp_tpa_next = incoming_arp_spa;
end else begin
// does not match -> drop it
drop_incoming_frame_next = 1;
end
end else begin
// does not match -> drop it
drop_incoming_frame_next = 1;
end
end else if (incoming_frame_valid & ~filtered_incoming_frame_valid) begin
// incoming invalid frame -> drop it
drop_incoming_frame_next = 1;
end
// manage ARP lookup requests
if (~arp_request_operation_reg) begin
if (arp_request_valid) begin
if (~(arp_request_ip | subnet_mask) == 0) begin
// broadcast address
// (all bits in request IP set where subnet mask is clear)
arp_request_valid_next = 0;
arp_response_broadcast_next = 1;
end else if (((arp_request_ip ^ gateway_ip) & subnet_mask) == 0) begin
// within subnet, look up IP directly
// (no bits differ between request IP and gateway IP where subnet mask is set)
arp_request_valid_next = 1;
arp_request_ip_next = arp_request_ip;
end else begin
// outside of subnet, so look up gateway address
arp_request_valid_next = 1;
arp_request_ip_next = gateway_ip;
end
end
if (cache_query_response_error & ~arp_response_error) begin
arp_request_operation_next = 1;
// send ARP request frame
outgoing_frame_valid_next = 1;
outgoing_eth_dest_mac_next = 48'hFF_FF_FF_FF_FF_FF;
outgoing_arp_oper_next = ARP_OPER_ARP_REQUEST;
outgoing_arp_tha_next = 48'h00_00_00_00_00_00;
outgoing_arp_tpa_next = arp_request_ip_reg;
arp_request_retry_cnt_next = REQUEST_RETRY_COUNT-1;
arp_request_timer_next = REQUEST_RETRY_INTERVAL;
end
end else begin
arp_request_timer_next = arp_request_timer_reg - 1;
// if we got a response, it will go in the cache, so when the query succeds, we're done
if (cache_query_response_valid & ~cache_query_response_error) begin
arp_request_operation_next = 0;
end
// timer timeout
if (arp_request_timer_reg == 0) begin
if (arp_request_retry_cnt_reg > 0) begin
// have more retries
// send ARP request frame
outgoing_frame_valid_next = 1'b1;
outgoing_eth_dest_mac_next = 48'hFF_FF_FF_FF_FF_FF;
outgoing_arp_oper_next = ARP_OPER_ARP_REQUEST;
outgoing_arp_tha_next = 48'h00_00_00_00_00_00;
outgoing_arp_tpa_next = arp_request_ip_reg;
arp_request_retry_cnt_next = arp_request_retry_cnt_reg - 1;
if (arp_request_retry_cnt_reg > 1) begin
arp_request_timer_next = REQUEST_RETRY_INTERVAL;
end else begin
arp_request_timer_next = REQUEST_TIMEOUT;
end
end else begin
// out of retries
arp_request_operation_next = 0;
arp_response_error_next = 1;
end
end
end
end
always @(posedge clk or posedge rst) begin
if (rst) begin
outgoing_frame_valid_reg <= 0;
outgoing_eth_dest_mac_reg <= 0;
outgoing_arp_oper_reg <= 0;
outgoing_arp_tha_reg <= 0;
outgoing_arp_tpa_reg <= 0;
cache_write_request_valid_reg <= 0;
cache_write_request_mac_reg <= 0;
cache_write_request_ip_reg <= 0;
arp_request_valid_reg <= 0;
arp_request_ip_reg <= 0;
arp_request_operation_reg <= 0;
arp_request_retry_cnt_reg <= 0;
arp_request_timer_reg <= 0;
arp_response_error_reg <= 0;
arp_response_broadcast_reg <= 0;
drop_incoming_frame_reg <= 0;
end else begin
outgoing_frame_valid_reg <= outgoing_frame_valid_next;
outgoing_eth_dest_mac_reg <= outgoing_eth_dest_mac_next;
outgoing_arp_oper_reg <= outgoing_arp_oper_next;
outgoing_arp_tha_reg <= outgoing_arp_tha_next;
outgoing_arp_tpa_reg <= outgoing_arp_tpa_next;
cache_write_request_valid_reg <= cache_write_request_valid_next;
cache_write_request_mac_reg <= cache_write_request_mac_next;
cache_write_request_ip_reg <= cache_write_request_ip_next;
arp_request_valid_reg <= arp_request_valid_next;
arp_request_ip_reg <= arp_request_ip_next;
arp_request_operation_reg <= arp_request_operation_next;
arp_request_retry_cnt_reg <= arp_request_retry_cnt_next;
arp_request_timer_reg <= arp_request_timer_next;
arp_response_error_reg <= arp_response_error_next;
arp_response_broadcast_reg <= arp_response_broadcast_next;
drop_incoming_frame_reg <= drop_incoming_frame_next;
end
end
endmodule

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tb/test_arp.py Executable file
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@ -0,0 +1,516 @@
#!/usr/bin/env python2
"""
Copyright (c) 2014 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""
from myhdl import *
import os
from Queue import Queue
import eth_ep
import arp_ep
module = 'arp'
srcs = []
srcs.append("../rtl/%s.v" % module)
srcs.append("../rtl/arp_cache.v")
srcs.append("../rtl/arp_eth_rx.v")
srcs.append("../rtl/arp_eth_tx.v")
srcs.append("test_%s.v" % module)
src = ' '.join(srcs)
build_cmd = "iverilog -o test_%s.vvp %s" % (module, src)
def dut_arp(clk,
rst,
current_test,
input_eth_hdr_valid,
input_eth_hdr_ready,
input_eth_dest_mac,
input_eth_src_mac,
input_eth_type,
input_eth_payload_tdata,
input_eth_payload_tvalid,
input_eth_payload_tready,
input_eth_payload_tlast,
input_eth_payload_tuser,
output_eth_hdr_valid,
output_eth_hdr_ready,
output_eth_dest_mac,
output_eth_src_mac,
output_eth_type,
output_eth_payload_tdata,
output_eth_payload_tvalid,
output_eth_payload_tready,
output_eth_payload_tlast,
output_eth_payload_tuser,
arp_request_valid,
arp_request_ip,
arp_response_valid,
arp_response_error,
arp_response_mac,
local_mac,
local_ip,
gateway_ip,
subnet_mask,
clear_cache):
if os.system(build_cmd):
raise Exception("Error running build command")
return Cosimulation("vvp -m myhdl test_%s.vvp -lxt2" % module,
clk=clk,
rst=rst,
current_test=current_test,
input_eth_hdr_valid=input_eth_hdr_valid,
input_eth_hdr_ready=input_eth_hdr_ready,
input_eth_dest_mac=input_eth_dest_mac,
input_eth_src_mac=input_eth_src_mac,
input_eth_type=input_eth_type,
input_eth_payload_tdata=input_eth_payload_tdata,
input_eth_payload_tvalid=input_eth_payload_tvalid,
input_eth_payload_tready=input_eth_payload_tready,
input_eth_payload_tlast=input_eth_payload_tlast,
input_eth_payload_tuser=input_eth_payload_tuser,
output_eth_hdr_valid=output_eth_hdr_valid,
output_eth_hdr_ready=output_eth_hdr_ready,
output_eth_dest_mac=output_eth_dest_mac,
output_eth_src_mac=output_eth_src_mac,
output_eth_type=output_eth_type,
output_eth_payload_tdata=output_eth_payload_tdata,
output_eth_payload_tvalid=output_eth_payload_tvalid,
output_eth_payload_tready=output_eth_payload_tready,
output_eth_payload_tlast=output_eth_payload_tlast,
output_eth_payload_tuser=output_eth_payload_tuser,
arp_request_valid=arp_request_valid,
arp_request_ip=arp_request_ip,
arp_response_valid=arp_response_valid,
arp_response_error=arp_response_error,
arp_response_mac=arp_response_mac,
local_mac=local_mac,
local_ip=local_ip,
gateway_ip=gateway_ip,
subnet_mask=subnet_mask,
clear_cache=clear_cache)
def bench():
# Inputs
clk = Signal(bool(0))
rst = Signal(bool(0))
current_test = Signal(intbv(0)[8:])
input_eth_hdr_valid = Signal(bool(0))
input_eth_dest_mac = Signal(intbv(0)[48:])
input_eth_src_mac = Signal(intbv(0)[48:])
input_eth_type = Signal(intbv(0)[16:])
input_eth_payload_tdata = Signal(intbv(0)[8:])
input_eth_payload_tvalid = Signal(bool(0))
input_eth_payload_tlast = Signal(bool(0))
input_eth_payload_tuser = Signal(bool(0))
output_eth_payload_tready = Signal(bool(0))
output_eth_hdr_ready = Signal(bool(0))
arp_request_valid = Signal(bool(0))
arp_request_ip = Signal(intbv(0)[32:])
local_mac = Signal(intbv(0)[48:])
local_ip = Signal(intbv(0)[32:])
gateway_ip = Signal(intbv(0)[32:])
subnet_mask = Signal(intbv(0)[32:])
clear_cache = Signal(bool(0))
# Outputs
input_eth_hdr_ready = Signal(bool(0))
input_eth_payload_tready = Signal(bool(0))
output_eth_hdr_valid = Signal(bool(0))
output_eth_dest_mac = Signal(intbv(0)[48:])
output_eth_src_mac = Signal(intbv(0)[48:])
output_eth_type = Signal(intbv(0)[16:])
output_eth_payload_tdata = Signal(intbv(0)[8:])
output_eth_payload_tvalid = Signal(bool(0))
output_eth_payload_tlast = Signal(bool(0))
output_eth_payload_tuser = Signal(bool(0))
arp_response_valid = Signal(bool(0))
arp_response_error = Signal(bool(0))
arp_response_mac = Signal(intbv(0)[48:])
# sources and sinks
source_queue = Queue()
source_pause = Signal(bool(0))
sink_queue = Queue()
sink_pause = Signal(bool(0))
source = eth_ep.EthFrameSource(clk,
rst,
eth_hdr_ready=input_eth_hdr_ready,
eth_hdr_valid=input_eth_hdr_valid,
eth_dest_mac=input_eth_dest_mac,
eth_src_mac=input_eth_src_mac,
eth_type=input_eth_type,
eth_payload_tdata=input_eth_payload_tdata,
eth_payload_tvalid=input_eth_payload_tvalid,
eth_payload_tready=input_eth_payload_tready,
eth_payload_tlast=input_eth_payload_tlast,
eth_payload_tuser=input_eth_payload_tuser,
fifo=source_queue,
pause=source_pause,
name='source')
sink = eth_ep.EthFrameSink(clk,
rst,
eth_hdr_ready=output_eth_hdr_ready,
eth_hdr_valid=output_eth_hdr_valid,
eth_dest_mac=output_eth_dest_mac,
eth_src_mac=output_eth_src_mac,
eth_type=output_eth_type,
eth_payload_tdata=output_eth_payload_tdata,
eth_payload_tvalid=output_eth_payload_tvalid,
eth_payload_tready=output_eth_payload_tready,
eth_payload_tlast=output_eth_payload_tlast,
eth_payload_tuser=output_eth_payload_tuser,
fifo=sink_queue,
pause=sink_pause,
name='sink')
# DUT
dut = dut_arp(clk,
rst,
current_test,
input_eth_hdr_valid,
input_eth_hdr_ready,
input_eth_dest_mac,
input_eth_src_mac,
input_eth_type,
input_eth_payload_tdata,
input_eth_payload_tvalid,
input_eth_payload_tready,
input_eth_payload_tlast,
input_eth_payload_tuser,
output_eth_hdr_valid,
output_eth_hdr_ready,
output_eth_dest_mac,
output_eth_src_mac,
output_eth_type,
output_eth_payload_tdata,
output_eth_payload_tvalid,
output_eth_payload_tready,
output_eth_payload_tlast,
output_eth_payload_tuser,
arp_request_valid,
arp_request_ip,
arp_response_valid,
arp_response_error,
arp_response_mac,
local_mac,
local_ip,
gateway_ip,
subnet_mask,
clear_cache)
@always(delay(4))
def clkgen():
clk.next = not clk
@instance
def check():
yield delay(100)
yield clk.posedge
rst.next = 1
yield clk.posedge
rst.next = 0
yield clk.posedge
yield delay(100)
yield clk.posedge
yield clk.posedge
local_mac.next = 0xDAD1D2D3D4D5
local_ip.next = 0xc0a80165
gateway_ip.next = 0xc0a80101
subnet_mask.next = 0xFFFFFF00
yield clk.posedge
print("test 1: ARP request")
current_test.next = 1
test_frame = arp_ep.ARPFrame()
test_frame.eth_dest_mac = 0xFFFFFFFFFFFF
test_frame.eth_src_mac = 0x5A5152535455
test_frame.eth_type = 0x0806
test_frame.arp_htype = 0x0001
test_frame.arp_ptype = 0x0800
test_frame.arp_hlen = 6
test_frame.arp_plen = 4
test_frame.arp_oper = 1
test_frame.arp_sha = 0x5A5152535455
test_frame.arp_spa = 0xc0a80164
test_frame.arp_tha = 0x000000000000
test_frame.arp_tpa = 0xc0a80165
source_queue.put(test_frame.build_eth())
yield clk.posedge
yield output_eth_payload_tlast.posedge
yield clk.posedge
yield clk.posedge
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0x5A5152535455
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 2
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x5A5152535455
assert check_frame.arp_tpa == 0xc0a80164
yield delay(100)
yield clk.posedge
print("test 2: Cached read")
current_test.next = 2
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a80164
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0x5A5152535455
yield delay(100)
yield clk.posedge
print("test 3: Unached read")
current_test.next = 3
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a80166
yield clk.posedge
arp_request_valid.next = False
# wait for ARP request packet
yield output_eth_payload_tlast.posedge
yield clk.posedge
yield clk.posedge
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0xFFFFFFFFFFFF
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 1
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x000000000000
assert check_frame.arp_tpa == 0xc0a80166
# generate response
test_frame = arp_ep.ARPFrame()
test_frame.eth_dest_mac = 0xDAD1D2D3D4D5
test_frame.eth_src_mac = 0x6A6162636465
test_frame.eth_type = 0x0806
test_frame.arp_htype = 0x0001
test_frame.arp_ptype = 0x0800
test_frame.arp_hlen = 6
test_frame.arp_plen = 4
test_frame.arp_oper = 2
test_frame.arp_sha = 0x6A6162636465
test_frame.arp_spa = 0xc0a80166
test_frame.arp_tha = 0xDAD1D2D3D4D5
test_frame.arp_tpa = 0xc0a80165
source_queue.put(test_frame.build_eth())
yield clk.posedge
# wait for lookup
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0x6A6162636465
yield delay(100)
yield clk.posedge
print("test 4: Unached read, outside of subnet")
current_test.next = 4
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0x08080808
yield clk.posedge
arp_request_valid.next = False
# wait for ARP request packet
yield output_eth_payload_tlast.posedge
yield clk.posedge
yield clk.posedge
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0xFFFFFFFFFFFF
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 1
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x000000000000
assert check_frame.arp_tpa == 0xc0a80101
# generate response
test_frame = arp_ep.ARPFrame()
test_frame.eth_dest_mac = 0xDAD1D2D3D4D5
test_frame.eth_src_mac = 0xAABBCCDDEEFF
test_frame.eth_type = 0x0806
test_frame.arp_htype = 0x0001
test_frame.arp_ptype = 0x0800
test_frame.arp_hlen = 6
test_frame.arp_plen = 4
test_frame.arp_oper = 2
test_frame.arp_sha = 0xAABBCCDDEEFF
test_frame.arp_spa = 0xc0a80101
test_frame.arp_tha = 0xDAD1D2D3D4D5
test_frame.arp_tpa = 0xc0a80165
source_queue.put(test_frame.build_eth())
yield clk.posedge
# wait for lookup
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0xAABBCCDDEEFF
yield delay(100)
yield clk.posedge
print("test 5: Unached read, timeout")
current_test.next = 5
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a80167
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert bool(arp_response_error)
# check for 4 ARP requests
assert sink_queue.qsize() == 4
while not sink_queue.empty():
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0xFFFFFFFFFFFF
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 1
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x000000000000
assert check_frame.arp_tpa == 0xc0a80167
yield delay(100)
yield clk.posedge
print("test 6: Broadcast")
current_test.next = 6
# subnet broadcast
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a801FF
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0xFFFFFFFFFFFF
# general broadcast
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xFFFFFFFF
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0xFFFFFFFFFFFF
yield delay(100)
raise StopSimulation
return dut, source, sink, clkgen, check
def test_bench():
sim = Simulation(bench())
sim.run()
if __name__ == '__main__':
print("Running test...")
test_bench()

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/*
Copyright (c) 2014 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Language: Verilog 2001
`timescale 1 ns / 1 ps
module test_arp;
// Inputs
reg clk = 0;
reg rst = 0;
reg [7:0] current_test = 0;
reg input_eth_hdr_valid = 0;
reg [47:0] input_eth_dest_mac = 0;
reg [47:0] input_eth_src_mac = 0;
reg [15:0] input_eth_type = 0;
reg [7:0] input_eth_payload_tdata = 0;
reg input_eth_payload_tvalid = 0;
reg input_eth_payload_tlast = 0;
reg input_eth_payload_tuser = 0;
reg output_eth_hdr_ready = 0;
reg output_eth_payload_tready = 0;
reg arp_request_valid = 0;
reg [31:0] arp_request_ip = 0;
reg [47:0] local_mac = 0;
reg [31:0] local_ip = 0;
reg [31:0] gateway_ip = 0;
reg [31:0] subnet_mask = 0;
reg clear_cache = 0;
// Outputs
wire input_eth_hdr_ready;
wire input_eth_payload_tready;
wire output_eth_hdr_valid;
wire [47:0] output_eth_dest_mac;
wire [47:0] output_eth_src_mac;
wire [15:0] output_eth_type;
wire [7:0] output_eth_payload_tdata;
wire output_eth_payload_tvalid;
wire output_eth_payload_tlast;
wire output_eth_payload_tuser;
wire arp_response_valid;
wire arp_response_error;
wire [47:0] arp_response_mac;
initial begin
// myhdl integration
$from_myhdl(clk,
rst,
current_test,
input_eth_hdr_valid,
input_eth_dest_mac,
input_eth_src_mac,
input_eth_type,
input_eth_payload_tdata,
input_eth_payload_tvalid,
input_eth_payload_tlast,
input_eth_payload_tuser,
output_eth_hdr_ready,
output_eth_payload_tready,
arp_request_valid,
arp_request_ip,
local_mac,
local_ip,
gateway_ip,
subnet_mask,
clear_cache);
$to_myhdl(input_eth_hdr_ready,
input_eth_payload_tready,
output_eth_hdr_valid,
output_eth_dest_mac,
output_eth_src_mac,
output_eth_type,
output_eth_payload_tdata,
output_eth_payload_tvalid,
output_eth_payload_tlast,
output_eth_payload_tuser,
arp_response_valid,
arp_response_error,
arp_response_mac);
// dump file
$dumpfile("test_arp.lxt");
$dumpvars(0, test_arp);
end
arp #(
.CACHE_ADDR_WIDTH(2),
.REQUEST_RETRY_COUNT(4),
.REQUEST_RETRY_INTERVAL(150),
.REQUEST_TIMEOUT(400)
)
UUT (
.clk(clk),
.rst(rst),
// Ethernet frame input
.input_eth_hdr_valid(input_eth_hdr_valid),
.input_eth_hdr_ready(input_eth_hdr_ready),
.input_eth_dest_mac(input_eth_dest_mac),
.input_eth_src_mac(input_eth_src_mac),
.input_eth_type(input_eth_type),
.input_eth_payload_tdata(input_eth_payload_tdata),
.input_eth_payload_tvalid(input_eth_payload_tvalid),
.input_eth_payload_tready(input_eth_payload_tready),
.input_eth_payload_tlast(input_eth_payload_tlast),
.input_eth_payload_tuser(input_eth_payload_tuser),
// Ethernet frame output
.output_eth_hdr_valid(output_eth_hdr_valid),
.output_eth_hdr_ready(output_eth_hdr_ready),
.output_eth_dest_mac(output_eth_dest_mac),
.output_eth_src_mac(output_eth_src_mac),
.output_eth_type(output_eth_type),
.output_eth_payload_tdata(output_eth_payload_tdata),
.output_eth_payload_tvalid(output_eth_payload_tvalid),
.output_eth_payload_tready(output_eth_payload_tready),
.output_eth_payload_tlast(output_eth_payload_tlast),
.output_eth_payload_tuser(output_eth_payload_tuser),
// ARP requests
.arp_request_valid(arp_request_valid),
.arp_request_ip(arp_request_ip),
.arp_response_valid(arp_response_valid),
.arp_response_error(arp_response_error),
.arp_response_mac(arp_response_mac),
// Configuration
.local_mac(local_mac),
.local_ip(local_ip),
.gateway_ip(gateway_ip),
.subnet_mask(subnet_mask),
.clear_cache(clear_cache)
);
endmodule

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#!/usr/bin/env python2
"""
Copyright (c) 2014 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""
from myhdl import *
import os
from Queue import Queue
import eth_ep
import arp_ep
module = 'arp_64'
srcs = []
srcs.append("../rtl/%s.v" % module)
srcs.append("../rtl/arp_cache.v")
srcs.append("../rtl/arp_eth_rx_64.v")
srcs.append("../rtl/arp_eth_tx_64.v")
srcs.append("test_%s.v" % module)
src = ' '.join(srcs)
build_cmd = "iverilog -o test_%s.vvp %s" % (module, src)
def dut_arp_64(clk,
rst,
current_test,
input_eth_hdr_valid,
input_eth_hdr_ready,
input_eth_dest_mac,
input_eth_src_mac,
input_eth_type,
input_eth_payload_tdata,
input_eth_payload_tkeep,
input_eth_payload_tvalid,
input_eth_payload_tready,
input_eth_payload_tlast,
input_eth_payload_tuser,
output_eth_hdr_valid,
output_eth_hdr_ready,
output_eth_dest_mac,
output_eth_src_mac,
output_eth_type,
output_eth_payload_tdata,
output_eth_payload_tkeep,
output_eth_payload_tvalid,
output_eth_payload_tready,
output_eth_payload_tlast,
output_eth_payload_tuser,
arp_request_valid,
arp_request_ip,
arp_response_valid,
arp_response_error,
arp_response_mac,
local_mac,
local_ip,
gateway_ip,
subnet_mask,
clear_cache):
if os.system(build_cmd):
raise Exception("Error running build command")
return Cosimulation("vvp -m myhdl test_%s.vvp -lxt2" % module,
clk=clk,
rst=rst,
current_test=current_test,
input_eth_hdr_valid=input_eth_hdr_valid,
input_eth_hdr_ready=input_eth_hdr_ready,
input_eth_dest_mac=input_eth_dest_mac,
input_eth_src_mac=input_eth_src_mac,
input_eth_type=input_eth_type,
input_eth_payload_tdata=input_eth_payload_tdata,
input_eth_payload_tkeep=input_eth_payload_tkeep,
input_eth_payload_tvalid=input_eth_payload_tvalid,
input_eth_payload_tready=input_eth_payload_tready,
input_eth_payload_tlast=input_eth_payload_tlast,
input_eth_payload_tuser=input_eth_payload_tuser,
output_eth_hdr_valid=output_eth_hdr_valid,
output_eth_hdr_ready=output_eth_hdr_ready,
output_eth_dest_mac=output_eth_dest_mac,
output_eth_src_mac=output_eth_src_mac,
output_eth_type=output_eth_type,
output_eth_payload_tdata=output_eth_payload_tdata,
output_eth_payload_tkeep=output_eth_payload_tkeep,
output_eth_payload_tvalid=output_eth_payload_tvalid,
output_eth_payload_tready=output_eth_payload_tready,
output_eth_payload_tlast=output_eth_payload_tlast,
output_eth_payload_tuser=output_eth_payload_tuser,
arp_request_valid=arp_request_valid,
arp_request_ip=arp_request_ip,
arp_response_valid=arp_response_valid,
arp_response_error=arp_response_error,
arp_response_mac=arp_response_mac,
local_mac=local_mac,
local_ip=local_ip,
gateway_ip=gateway_ip,
subnet_mask=subnet_mask,
clear_cache=clear_cache)
def bench():
# Inputs
clk = Signal(bool(0))
rst = Signal(bool(0))
current_test = Signal(intbv(0)[8:])
input_eth_hdr_valid = Signal(bool(0))
input_eth_dest_mac = Signal(intbv(0)[48:])
input_eth_src_mac = Signal(intbv(0)[48:])
input_eth_type = Signal(intbv(0)[16:])
input_eth_payload_tdata = Signal(intbv(0)[64:])
input_eth_payload_tkeep = Signal(intbv(0)[8:])
input_eth_payload_tvalid = Signal(bool(0))
input_eth_payload_tlast = Signal(bool(0))
input_eth_payload_tuser = Signal(bool(0))
output_eth_payload_tready = Signal(bool(0))
output_eth_hdr_ready = Signal(bool(0))
arp_request_valid = Signal(bool(0))
arp_request_ip = Signal(intbv(0)[32:])
local_mac = Signal(intbv(0)[48:])
local_ip = Signal(intbv(0)[32:])
gateway_ip = Signal(intbv(0)[32:])
subnet_mask = Signal(intbv(0)[32:])
clear_cache = Signal(bool(0))
# Outputs
input_eth_hdr_ready = Signal(bool(0))
input_eth_payload_tready = Signal(bool(0))
output_eth_hdr_valid = Signal(bool(0))
output_eth_dest_mac = Signal(intbv(0)[48:])
output_eth_src_mac = Signal(intbv(0)[48:])
output_eth_type = Signal(intbv(0)[16:])
output_eth_payload_tdata = Signal(intbv(0)[64:])
output_eth_payload_tkeep = Signal(intbv(0)[8:])
output_eth_payload_tvalid = Signal(bool(0))
output_eth_payload_tlast = Signal(bool(0))
output_eth_payload_tuser = Signal(bool(0))
arp_response_valid = Signal(bool(0))
arp_response_error = Signal(bool(0))
arp_response_mac = Signal(intbv(0)[48:])
# sources and sinks
source_queue = Queue()
source_pause = Signal(bool(0))
sink_queue = Queue()
sink_pause = Signal(bool(0))
source = eth_ep.EthFrameSource(clk,
rst,
eth_hdr_ready=input_eth_hdr_ready,
eth_hdr_valid=input_eth_hdr_valid,
eth_dest_mac=input_eth_dest_mac,
eth_src_mac=input_eth_src_mac,
eth_type=input_eth_type,
eth_payload_tdata=input_eth_payload_tdata,
eth_payload_tkeep=input_eth_payload_tkeep,
eth_payload_tvalid=input_eth_payload_tvalid,
eth_payload_tready=input_eth_payload_tready,
eth_payload_tlast=input_eth_payload_tlast,
eth_payload_tuser=input_eth_payload_tuser,
fifo=source_queue,
pause=source_pause,
name='source')
sink = eth_ep.EthFrameSink(clk,
rst,
eth_hdr_ready=output_eth_hdr_ready,
eth_hdr_valid=output_eth_hdr_valid,
eth_dest_mac=output_eth_dest_mac,
eth_src_mac=output_eth_src_mac,
eth_type=output_eth_type,
eth_payload_tdata=output_eth_payload_tdata,
eth_payload_tkeep=output_eth_payload_tkeep,
eth_payload_tvalid=output_eth_payload_tvalid,
eth_payload_tready=output_eth_payload_tready,
eth_payload_tlast=output_eth_payload_tlast,
eth_payload_tuser=output_eth_payload_tuser,
fifo=sink_queue,
pause=sink_pause,
name='sink')
# DUT
dut = dut_arp_64(clk,
rst,
current_test,
input_eth_hdr_valid,
input_eth_hdr_ready,
input_eth_dest_mac,
input_eth_src_mac,
input_eth_type,
input_eth_payload_tdata,
input_eth_payload_tkeep,
input_eth_payload_tvalid,
input_eth_payload_tready,
input_eth_payload_tlast,
input_eth_payload_tuser,
output_eth_hdr_valid,
output_eth_hdr_ready,
output_eth_dest_mac,
output_eth_src_mac,
output_eth_type,
output_eth_payload_tdata,
output_eth_payload_tkeep,
output_eth_payload_tvalid,
output_eth_payload_tready,
output_eth_payload_tlast,
output_eth_payload_tuser,
arp_request_valid,
arp_request_ip,
arp_response_valid,
arp_response_error,
arp_response_mac,
local_mac,
local_ip,
gateway_ip,
subnet_mask,
clear_cache)
@always(delay(4))
def clkgen():
clk.next = not clk
@instance
def check():
yield delay(100)
yield clk.posedge
rst.next = 1
yield clk.posedge
rst.next = 0
yield clk.posedge
yield delay(100)
yield clk.posedge
yield clk.posedge
local_mac.next = 0xDAD1D2D3D4D5
local_ip.next = 0xc0a80165
gateway_ip.next = 0xc0a80101
subnet_mask.next = 0xFFFFFF00
yield clk.posedge
print("test 1: ARP request")
current_test.next = 1
test_frame = arp_ep.ARPFrame()
test_frame.eth_dest_mac = 0xFFFFFFFFFFFF
test_frame.eth_src_mac = 0x5A5152535455
test_frame.eth_type = 0x0806
test_frame.arp_htype = 0x0001
test_frame.arp_ptype = 0x0800
test_frame.arp_hlen = 6
test_frame.arp_plen = 4
test_frame.arp_oper = 1
test_frame.arp_sha = 0x5A5152535455
test_frame.arp_spa = 0xc0a80164
test_frame.arp_tha = 0x000000000000
test_frame.arp_tpa = 0xc0a80165
source_queue.put(test_frame.build_eth())
yield clk.posedge
yield output_eth_payload_tlast.posedge
yield clk.posedge
yield clk.posedge
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0x5A5152535455
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 2
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x5A5152535455
assert check_frame.arp_tpa == 0xc0a80164
yield delay(100)
yield clk.posedge
print("test 2: Cached read")
current_test.next = 2
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a80164
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0x5A5152535455
yield delay(100)
yield clk.posedge
print("test 3: Unached read")
current_test.next = 3
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a80166
yield clk.posedge
arp_request_valid.next = False
# wait for ARP request packet
yield output_eth_payload_tlast.posedge
yield clk.posedge
yield clk.posedge
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0xFFFFFFFFFFFF
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 1
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x000000000000
assert check_frame.arp_tpa == 0xc0a80166
# generate response
test_frame = arp_ep.ARPFrame()
test_frame.eth_dest_mac = 0xDAD1D2D3D4D5
test_frame.eth_src_mac = 0x6A6162636465
test_frame.eth_type = 0x0806
test_frame.arp_htype = 0x0001
test_frame.arp_ptype = 0x0800
test_frame.arp_hlen = 6
test_frame.arp_plen = 4
test_frame.arp_oper = 2
test_frame.arp_sha = 0x6A6162636465
test_frame.arp_spa = 0xc0a80166
test_frame.arp_tha = 0xDAD1D2D3D4D5
test_frame.arp_tpa = 0xc0a80165
source_queue.put(test_frame.build_eth())
yield clk.posedge
# wait for lookup
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0x6A6162636465
yield delay(100)
yield clk.posedge
print("test 4: Unached read, outside of subnet")
current_test.next = 4
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0x08080808
yield clk.posedge
arp_request_valid.next = False
# wait for ARP request packet
yield output_eth_payload_tlast.posedge
yield clk.posedge
yield clk.posedge
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0xFFFFFFFFFFFF
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 1
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x000000000000
assert check_frame.arp_tpa == 0xc0a80101
# generate response
test_frame = arp_ep.ARPFrame()
test_frame.eth_dest_mac = 0xDAD1D2D3D4D5
test_frame.eth_src_mac = 0xAABBCCDDEEFF
test_frame.eth_type = 0x0806
test_frame.arp_htype = 0x0001
test_frame.arp_ptype = 0x0800
test_frame.arp_hlen = 6
test_frame.arp_plen = 4
test_frame.arp_oper = 2
test_frame.arp_sha = 0xAABBCCDDEEFF
test_frame.arp_spa = 0xc0a80101
test_frame.arp_tha = 0xDAD1D2D3D4D5
test_frame.arp_tpa = 0xc0a80165
source_queue.put(test_frame.build_eth())
yield clk.posedge
# wait for lookup
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0xAABBCCDDEEFF
yield delay(100)
yield clk.posedge
print("test 5: Unached read, timeout")
current_test.next = 5
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a80167
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert bool(arp_response_error)
# check for 4 ARP requests
assert sink_queue.qsize() == 4
while not sink_queue.empty():
rx_frame = sink_queue.get(False)
check_frame = arp_ep.ARPFrame()
check_frame.parse_eth(rx_frame)
assert check_frame.eth_dest_mac == 0xFFFFFFFFFFFF
assert check_frame.eth_src_mac == 0xDAD1D2D3D4D5
assert check_frame.eth_type == 0x0806
assert check_frame.arp_htype == 0x0001
assert check_frame.arp_ptype == 0x0800
assert check_frame.arp_hlen == 6
assert check_frame.arp_plen == 4
assert check_frame.arp_oper == 1
assert check_frame.arp_sha == 0xDAD1D2D3D4D5
assert check_frame.arp_spa == 0xc0a80165
assert check_frame.arp_tha == 0x000000000000
assert check_frame.arp_tpa == 0xc0a80167
yield delay(100)
yield clk.posedge
print("test 6: Broadcast")
current_test.next = 6
# subnet broadcast
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xc0a801FF
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0xFFFFFFFFFFFF
# general broadcast
yield clk.posedge
arp_request_valid.next = True
arp_request_ip.next = 0xFFFFFFFF
yield clk.posedge
arp_request_valid.next = False
yield arp_response_valid.posedge
assert not bool(arp_response_error)
assert int(arp_response_mac) == 0xFFFFFFFFFFFF
yield delay(100)
raise StopSimulation
return dut, source, sink, clkgen, check
def test_bench():
sim = Simulation(bench())
sim.run()
if __name__ == '__main__':
print("Running test...")
test_bench()

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/*
Copyright (c) 2014 Alex Forencich
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Language: Verilog 2001
`timescale 1 ns / 1 ps
module test_arp_64;
// Inputs
reg clk = 0;
reg rst = 0;
reg [7:0] current_test = 0;
reg input_eth_hdr_valid = 0;
reg [47:0] input_eth_dest_mac = 0;
reg [47:0] input_eth_src_mac = 0;
reg [15:0] input_eth_type = 0;
reg [63:0] input_eth_payload_tdata = 0;
reg [7:0] input_eth_payload_tkeep = 0;
reg input_eth_payload_tvalid = 0;
reg input_eth_payload_tlast = 0;
reg input_eth_payload_tuser = 0;
reg output_eth_hdr_ready = 0;
reg output_eth_payload_tready = 0;
reg arp_request_valid = 0;
reg [31:0] arp_request_ip = 0;
reg [47:0] local_mac = 0;
reg [31:0] local_ip = 0;
reg [31:0] gateway_ip = 0;
reg [31:0] subnet_mask = 0;
reg clear_cache = 0;
// Outputs
wire input_eth_hdr_ready;
wire input_eth_payload_tready;
wire output_eth_hdr_valid;
wire [47:0] output_eth_dest_mac;
wire [47:0] output_eth_src_mac;
wire [15:0] output_eth_type;
wire [63:0] output_eth_payload_tdata;
wire [7:0] output_eth_payload_tkeep;
wire output_eth_payload_tvalid;
wire output_eth_payload_tlast;
wire output_eth_payload_tuser;
wire arp_response_valid;
wire arp_response_error;
wire [47:0] arp_response_mac;
initial begin
// myhdl integration
$from_myhdl(clk,
rst,
current_test,
input_eth_hdr_valid,
input_eth_dest_mac,
input_eth_src_mac,
input_eth_type,
input_eth_payload_tdata,
input_eth_payload_tkeep,
input_eth_payload_tvalid,
input_eth_payload_tlast,
input_eth_payload_tuser,
output_eth_hdr_ready,
output_eth_payload_tready,
arp_request_valid,
arp_request_ip,
local_mac,
local_ip,
gateway_ip,
subnet_mask,
clear_cache);
$to_myhdl(input_eth_hdr_ready,
input_eth_payload_tready,
output_eth_hdr_valid,
output_eth_dest_mac,
output_eth_src_mac,
output_eth_type,
output_eth_payload_tdata,
output_eth_payload_tkeep,
output_eth_payload_tvalid,
output_eth_payload_tlast,
output_eth_payload_tuser,
arp_response_valid,
arp_response_error,
arp_response_mac);
// dump file
$dumpfile("test_arp_64.lxt");
$dumpvars(0, test_arp_64);
end
arp_64 #(
.CACHE_ADDR_WIDTH(2),
.REQUEST_RETRY_COUNT(4),
.REQUEST_RETRY_INTERVAL(150),
.REQUEST_TIMEOUT(400)
)
UUT (
.clk(clk),
.rst(rst),
// Ethernet frame input
.input_eth_hdr_valid(input_eth_hdr_valid),
.input_eth_hdr_ready(input_eth_hdr_ready),
.input_eth_dest_mac(input_eth_dest_mac),
.input_eth_src_mac(input_eth_src_mac),
.input_eth_type(input_eth_type),
.input_eth_payload_tdata(input_eth_payload_tdata),
.input_eth_payload_tkeep(input_eth_payload_tkeep),
.input_eth_payload_tvalid(input_eth_payload_tvalid),
.input_eth_payload_tready(input_eth_payload_tready),
.input_eth_payload_tlast(input_eth_payload_tlast),
.input_eth_payload_tuser(input_eth_payload_tuser),
// Ethernet frame output
.output_eth_hdr_valid(output_eth_hdr_valid),
.output_eth_hdr_ready(output_eth_hdr_ready),
.output_eth_dest_mac(output_eth_dest_mac),
.output_eth_src_mac(output_eth_src_mac),
.output_eth_type(output_eth_type),
.output_eth_payload_tdata(output_eth_payload_tdata),
.output_eth_payload_tkeep(output_eth_payload_tkeep),
.output_eth_payload_tvalid(output_eth_payload_tvalid),
.output_eth_payload_tready(output_eth_payload_tready),
.output_eth_payload_tlast(output_eth_payload_tlast),
.output_eth_payload_tuser(output_eth_payload_tuser),
// ARP requests
.arp_request_valid(arp_request_valid),
.arp_request_ip(arp_request_ip),
.arp_response_valid(arp_response_valid),
.arp_response_error(arp_response_error),
.arp_response_mac(arp_response_mac),
// Configuration
.local_mac(local_mac),
.local_ip(local_ip),
.gateway_ip(gateway_ip),
.subnet_mask(subnet_mask),
.clear_cache(clear_cache)
);
endmodule