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/*
 * $ptp_parser.v
 *
 * Copyright (c) 2012, BBY&HW. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */
 
`timescale 1ns/1ns
 
module ptp_parser (
  input        clk, rst,
  input [31:0] int_data,
  input        int_valid,
  input        int_sop,
  input        int_eop,
  input [ 1:0] int_mod,
 
  output reg        ptp_found,
  output reg [19:0] ptp_infor
);
 
reg [31:0] int_data_d1;
always @(posedge rst or posedge clk) begin
  if (rst) begin
    int_data_d1  <= 32'h00000000;
  end
  else begin
    if (int_valid) begin
      int_data_d1  <= int_data;
    end
  end
end
 
// packet parser: counter
reg [ 9:0] int_cnt, bypass_ipv4_cnt, bypass_ipv6_cnt, bypass_udp_cnt, ptp_cnt;
reg bypass_vlan, ptp_l2, bypass_mpls, bypass_ipv4, bypass_ipv6, found_udp, bypass_udp, ptp_l4, ptp_event;
reg [ 3:0] ptp_msgid;
reg [15:0] ptp_seqid;
always @(posedge rst or posedge clk) begin
  if (rst) begin
    int_cnt <= 10'd0;
    bypass_ipv4_cnt <= 10'd0;
    bypass_ipv6_cnt <= 10'd0;
    bypass_udp_cnt <= 10'd0;
  end
  else begin
    if (int_valid && int_sop)
      int_cnt <= 10'd0;
    else if (int_valid)
      int_cnt <= int_cnt + 10'd1 - bypass_vlan - bypass_mpls - (bypass_ipv4 || bypass_ipv6 || bypass_udp);
 
    if (int_valid && int_sop)
      bypass_ipv4_cnt <= 10'd0;
    else if (int_valid && bypass_ipv4)
      bypass_ipv4_cnt <= bypass_ipv4_cnt + 10'd1;
 
    if (int_valid && int_sop)
      bypass_ipv6_cnt <= 10'd0;
    else if (int_valid && bypass_ipv6)
      bypass_ipv6_cnt <= bypass_ipv6_cnt + 10'd1;
 
    if (int_valid && int_sop)
      bypass_udp_cnt <= 10'd0;
    else if (int_valid && bypass_udp)
      bypass_udp_cnt <= bypass_udp_cnt + 10'd1;
 
    if (int_valid && int_sop)
      ptp_cnt <= 10'd0;
    else if (int_valid && (ptp_l2 || (bypass_udp_cnt>=10'd2 && ptp_l4)))
      ptp_cnt <= ptp_cnt + 10'd1;
  end
end
 
// packet parser: comparator
always @(posedge rst or posedge clk) begin
  if (rst) begin
    bypass_vlan  <= 1'b0;
    bypass_mpls  <= 1'b0;
    bypass_ipv4  <= 1'b0;
    bypass_ipv6  <= 1'b0;
    found_udp    <= 1'b0;
    bypass_udp   <= 1'b0;
    ptp_l2    <= 1'b0;
    ptp_l4    <= 1'b0;
    ptp_event <= 1'b0;
  end
  else if (int_valid && int_sop) begin
    bypass_vlan  <= 1'b0;
    bypass_mpls  <= 1'b0;
    bypass_ipv4  <= 1'b0;
    bypass_ipv6  <= 1'b0;
    found_udp    <= 1'b0;
    bypass_udp   <= 1'b0;
    ptp_l2    <= 1'b0;
    ptp_l4    <= 1'b0;
    ptp_event <= 1'b0;
  end
  else begin
    // bypass vlan
    if      (int_valid && int_cnt==10'd3 && int_data[31:16]==16'h8100)  // ether_type == cvlan
      bypass_vlan <= 1'b1;
    else if (int_valid && int_cnt==10'd3 && int_data[31:16]==16'h9100)  // ether_type == svlan
      bypass_vlan <= 1'b1;
    else if (int_valid && int_cnt==10'd4 && int_data[31:16]==16'h8100 && bypass_vlan)  // svlan_type == cvlan
      bypass_vlan <= 1'b1;
    else if (int_valid && bypass_vlan)
      bypass_vlan <= 1'b0;
 
    // bypass mpls
    if      (int_valid && (int_cnt==10'd3 || bypass_vlan && int_cnt==10'd4) &&
            (int_data[31:16]==16'h8847 || int_data[31:16]==16'h8848))  // ether_type == mpls
      bypass_mpls <= 1'b1;
    else if (int_valid &&  int_cnt==10'd4 && bypass_mpls &&
             int_data[24]==1'b0)  // bottom of label stack == 0
      bypass_mpls <= 1'b1;
    else if (int_valid && bypass_mpls)
      bypass_mpls <= 1'b0;
 
    // bypass ipv4
    if      (int_valid && (int_cnt==10'd3 || (bypass_vlan || bypass_mpls) && int_cnt==10'd4) && bypass_ipv4_cnt==10'd0 &&
            (int_data[31:16]==16'h0800 || bypass_mpls) && int_data[15:12]==4'h4)  // ether_type == ipv4, ip_version == 4
      bypass_ipv4 <= 1'b1;
    else if (int_valid && bypass_ipv4_cnt==10'd4)
      bypass_ipv4 <= 1'b0;
 
    // bypass ipv6
    if      (int_valid && (int_cnt==10'd3 || (bypass_vlan || bypass_mpls) && int_cnt==10'd4) && bypass_ipv6_cnt==10'd0 &&
            (int_data[31:16]==16'h86dd || bypass_mpls) && int_data[15:12]==4'h6)  // ether_type == ipv6, ip_version == 6
      bypass_ipv6 <= 1'b1;
    else if (int_valid && bypass_ipv6_cnt==10'd9)
      bypass_ipv6 <= 1'b0;
 
    // check if it is UDP
    if      (int_valid && bypass_ipv4_cnt==10'd1 && int_data[ 7: 0]== 8'h11)  // ipv4_protocol == udp
      found_udp <= 1'b1;
    else if (int_valid && bypass_ipv6_cnt==10'd1 && int_data[31:24]== 8'h11)  // ipv6_protocol == udp
      found_udp <= 1'b1;
 
    // bypass udp
    if      (int_valid && bypass_ipv4_cnt==10'd4 && bypass_udp_cnt==10'd0 && found_udp)  // ipv4_udp
      bypass_udp <= 1'b1;
    else if (int_valid && bypass_ipv6_cnt==10'd9 && bypass_udp_cnt==10'd0 && found_udp)  // ipv6_udp
      bypass_udp <= 1'b1;
    else if (int_valid && bypass_udp_cnt==10'd2)
      bypass_udp <= 1'b0;
 
    // check if it is L2 PTP
    if (int_valid && (int_cnt==10'd3 || bypass_vlan && int_cnt==10'd4) && int_data[31:16]==16'h88F7)  // ether_type == ptp
      ptp_l2 <= 1'b1;
    // check if it is L4 PTP
    if (int_valid && bypass_udp_cnt==10'd0 && bypass_udp &&
       (int_data[31:16]==16'h013f || int_data[31:16]==16'h0140))  // udp_dest_port == ptp_event || ptp_general
      ptp_l4 <= 1'b1;
 
    // check if it is PTP Event message
    if      (int_valid && (int_cnt==10'd3 || bypass_vlan && int_cnt==10'd4) && int_data[31:16]==16'h88F7 &&
            (int_data[11: 8]== 4'h0 || int_data[11:8]==4'h2))  // ptp_message_id == sync || delay_req
      ptp_event <= 1'b1;
    else if (int_valid && int_cnt==10'd4 && bypass_udp_cnt==10'd1 && ptp_l4 &&
            (int_data[11: 8]== 4'h0 || int_data[11:8]==4'h2))  // ptp_message_id == sync || delay_req
      ptp_event <= 1'b1;
  end
end
 
// ptp message
reg [31:0] ptp_data;
always @(posedge rst or posedge clk) begin
  if (rst) begin
    ptp_data  <= 32'd0;
    ptp_msgid <= 4'd0;
    ptp_seqid <= 16'd0;
  end
  else if (int_valid && int_sop) begin
    ptp_data  <= 32'd0;
    ptp_msgid <= 4'd0;
    ptp_seqid <= 16'd0;
  end
  else begin
    // get PTP identification information as additional information to Timestamp
    // ptp message body
    if (int_valid && (ptp_l2 || (bypass_udp_cnt>=10'd2 && ptp_l4)))
      ptp_data <= {int_data_d1[15:0], int_data[31:16]};
    // message id
    if (int_valid && ptp_cnt==10'd1)
      ptp_msgid <=   ptp_data[27:24];
    // sequence id
    if (int_valid && ptp_cnt==10'd8)
      ptp_seqid <=   ptp_data[15:0];
  end
end
 
// parser output
always @(posedge rst or posedge clk) begin
  if (rst) begin
    ptp_found <=  1'b0;
    ptp_infor <= 20'd0;
  end
  else if (int_valid && int_sop) begin
    ptp_found <=  1'b0;
    ptp_infor <= 20'd0;
  end
  else if (int_valid && ptp_cnt==10'd9) begin
    ptp_found <=  ptp_event;
    ptp_infor <= {ptp_msgid, ptp_seqid};  // 4+16
  end
end
 
endmodule

Line No.	Rev	Author	Line
1	34	edn_walter	`/*`
2			`* $ptp_parser.v`
3			`*`
4			`* Copyright (c) 2012, BBY&HW. All rights reserved.`
5			`*`
6			`* This library is free software; you can redistribute it and/or`
7			`* modify it under the terms of the GNU Lesser General Public`
8			`* License as published by the Free Software Foundation; either`
9			`* version 2.1 of the License, or (at your option) any later version.`
10			`*`
11			`* This library is distributed in the hope that it will be useful,`
12			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
14			`* Lesser General Public License for more details.`
15			`*`
16			`* You should have received a copy of the GNU Lesser General Public`
17			`* License along with this library; if not, write to the Free Software`
18			`* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,`
19			`* MA 02110-1301 USA`
20			`*/`
21
22	4	ash_riple	`timescale 1ns/1ns
23
24			`module ptp_parser (`
25			`input clk, rst,`
26	10	edn_walter	`input [31:0] int_data,`
27			`input int_valid,`
28			`input int_sop,`
29			`input int_eop,`
30			`input [ 1:0] int_mod,`
31	4	ash_riple
32			`output reg ptp_found,`
33	27	edn_walter	`output reg [19:0] ptp_infor`
34	4	ash_riple	`);`
35
36	10	edn_walter	`reg [31:0] int_data_d1;`
37	4	ash_riple	`always @(posedge rst or posedge clk) begin`
38			`if (rst) begin`
39	10	edn_walter	`int_data_d1 <= 32'h00000000;`
40	4	ash_riple	`end`
41			`else begin`
42	10	edn_walter	`if (int_valid) begin`
43			`int_data_d1 <= int_data;`
44	4	ash_riple	`end`
45			`end`
46			`end`
47
48	29	edn_walter	`// packet parser: counter`
49	10	edn_walter	`reg [ 9:0] int_cnt, bypass_ipv4_cnt, bypass_ipv6_cnt, bypass_udp_cnt, ptp_cnt;`
50	35	edn_walter	`reg bypass_vlan, ptp_l2, bypass_mpls, bypass_ipv4, bypass_ipv6, found_udp, bypass_udp, ptp_l4, ptp_event;`
51	8	edn_walter	`reg [ 3:0] ptp_msgid;`
52			`reg [15:0] ptp_seqid;`
53	4	ash_riple	`always @(posedge rst or posedge clk) begin`
54	10	edn_walter	`if (rst) begin`
55			`int_cnt <= 10'd0;`
56			`bypass_ipv4_cnt <= 10'd0;`
57	11	edn_walter	`bypass_ipv6_cnt <= 10'd0;`
58	10	edn_walter	`bypass_udp_cnt <= 10'd0;`
59			`end`
60			`else begin`
61	29	edn_walter	`if (int_valid && int_sop)`
62	10	edn_walter	`int_cnt <= 10'd0;`
63	29	edn_walter	`else if (int_valid)`
64	35	edn_walter	`int_cnt <= int_cnt + 10'd1 - bypass_vlan - bypass_mpls - (bypass_ipv4 \|\| bypass_ipv6 \|\| bypass_udp);`
65	10	edn_walter
66	29	edn_walter	`if (int_valid && int_sop)`
67	10	edn_walter	`bypass_ipv4_cnt <= 10'd0;`
68	29	edn_walter	`else if (int_valid && bypass_ipv4)`
69	10	edn_walter	`bypass_ipv4_cnt <= bypass_ipv4_cnt + 10'd1;`
70
71	29	edn_walter	`if (int_valid && int_sop)`
72	11	edn_walter	`bypass_ipv6_cnt <= 10'd0;`
73	29	edn_walter	`else if (int_valid && bypass_ipv6)`
74	11	edn_walter	`bypass_ipv6_cnt <= bypass_ipv6_cnt + 10'd1;`
75
76	29	edn_walter	`if (int_valid && int_sop)`
77	10	edn_walter	`bypass_udp_cnt <= 10'd0;`
78	29	edn_walter	`else if (int_valid && bypass_udp)`
79	10	edn_walter	`bypass_udp_cnt <= bypass_udp_cnt + 10'd1;`
80	29	edn_walter
81			`if (int_valid && int_sop)`
82			`ptp_cnt <= 10'd0;`
83			`else if (int_valid && (ptp_l2 \|\| (bypass_udp_cnt>=10'd2 && ptp_l4)))`
84			`ptp_cnt <= ptp_cnt + 10'd1;`
85	10	edn_walter	`end`
86	4	ash_riple	`end`
87
88	29	edn_walter	`// packet parser: comparator`
89	4	ash_riple	`always @(posedge rst or posedge clk) begin`
90			`if (rst) begin`
91	10	edn_walter	`bypass_vlan <= 1'b0;`
92	35	edn_walter	`bypass_mpls <= 1'b0;`
93	10	edn_walter	`bypass_ipv4 <= 1'b0;`
94	11	edn_walter	`bypass_ipv6 <= 1'b0;`
95	10	edn_walter	`found_udp <= 1'b0;`
96			`bypass_udp <= 1'b0;`
97			`ptp_l2 <= 1'b0;`
98			`ptp_l4 <= 1'b0;`
99	4	ash_riple	`ptp_event <= 1'b0;`
100	10	edn_walter	`end`
101	29	edn_walter	`else if (int_valid && int_sop) begin`
102	10	edn_walter	`bypass_vlan <= 1'b0;`
103	35	edn_walter	`bypass_mpls <= 1'b0;`
104	10	edn_walter	`bypass_ipv4 <= 1'b0;`
105	11	edn_walter	`bypass_ipv6 <= 1'b0;`
106	10	edn_walter	`found_udp <= 1'b0;`
107			`bypass_udp <= 1'b0;`
108			`ptp_l2 <= 1'b0;`
109			`ptp_l4 <= 1'b0;`
110			`ptp_event <= 1'b0;`
111			`end`
112			`else begin`
113			`// bypass vlan`
114	29	edn_walter	`if (int_valid && int_cnt==10'd3 && int_data[31:16]==16'h8100) // ether_type == cvlan`
115	10	edn_walter	`bypass_vlan <= 1'b1;`
116	29	edn_walter	`else if (int_valid && int_cnt==10'd3 && int_data[31:16]==16'h9100) // ether_type == svlan`
117	12	edn_walter	`bypass_vlan <= 1'b1;`
118	29	edn_walter	`else if (int_valid && int_cnt==10'd4 && int_data[31:16]==16'h8100 && bypass_vlan) // svlan_type == cvlan`
119	12	edn_walter	`bypass_vlan <= 1'b1;`
120	29	edn_walter	`else if (int_valid && bypass_vlan)`
121	10	edn_walter	`bypass_vlan <= 1'b0;`
122
123	35	edn_walter	`// bypass mpls`
124			`if (int_valid && (int_cnt==10'd3 \|\| bypass_vlan && int_cnt==10'd4) &&`
125			`(int_data[31:16]==16'h8847 \|\| int_data[31:16]==16'h8848)) // ether_type == mpls`
126			`bypass_mpls <= 1'b1;`
127			`else if (int_valid && int_cnt==10'd4 && bypass_mpls &&`
128			`int_data[24]==1'b0) // bottom of label stack == 0`
129			`bypass_mpls <= 1'b1;`
130			`else if (int_valid && bypass_mpls)`
131			`bypass_mpls <= 1'b0;`
132
133	10	edn_walter	`// bypass ipv4`
134	35	edn_walter	`if (int_valid && (int_cnt==10'd3 \|\| (bypass_vlan \|\| bypass_mpls) && int_cnt==10'd4) && bypass_ipv4_cnt==10'd0 &&`
135			`(int_data[31:16]==16'h0800 \|\| bypass_mpls) && int_data[15:12]==4'h4) // ether_type == ipv4, ip_version == 4`
136	10	edn_walter	`bypass_ipv4 <= 1'b1;`
137	29	edn_walter	`else if (int_valid && bypass_ipv4_cnt==10'd4)`
138	10	edn_walter	`bypass_ipv4 <= 1'b0;`
139
140			`// bypass ipv6`
141	35	edn_walter	`if (int_valid && (int_cnt==10'd3 \|\| (bypass_vlan \|\| bypass_mpls) && int_cnt==10'd4) && bypass_ipv6_cnt==10'd0 &&`
142			`(int_data[31:16]==16'h86dd \|\| bypass_mpls) && int_data[15:12]==4'h6) // ether_type == ipv6, ip_version == 6`
143	11	edn_walter	`bypass_ipv6 <= 1'b1;`
144	29	edn_walter	`else if (int_valid && bypass_ipv6_cnt==10'd9)`
145	11	edn_walter	`bypass_ipv6 <= 1'b0;`
146	10	edn_walter
147			`// check if it is UDP`
148	29	edn_walter	`if (int_valid && bypass_ipv4_cnt==10'd1 && int_data[ 7: 0]== 8'h11) // ipv4_protocol == udp`
149	10	edn_walter	`found_udp <= 1'b1;`
150	29	edn_walter	`else if (int_valid && bypass_ipv6_cnt==10'd1 && int_data[31:24]== 8'h11) // ipv6_protocol == udp`
151	11	edn_walter	`found_udp <= 1'b1;`
152	10	edn_walter
153			`// bypass udp`
154	29	edn_walter	`if (int_valid && bypass_ipv4_cnt==10'd4 && bypass_udp_cnt==10'd0 && found_udp) // ipv4_udp`
155	10	edn_walter	`bypass_udp <= 1'b1;`
156	29	edn_walter	`else if (int_valid && bypass_ipv6_cnt==10'd9 && bypass_udp_cnt==10'd0 && found_udp) // ipv6_udp`
157	11	edn_walter	`bypass_udp <= 1'b1;`
158	29	edn_walter	`else if (int_valid && bypass_udp_cnt==10'd2)`
159	11	edn_walter	`bypass_udp <= 1'b0;`
160	10	edn_walter
161			`// check if it is L2 PTP`
162	29	edn_walter	`if (int_valid && (int_cnt==10'd3 \|\| bypass_vlan && int_cnt==10'd4) && int_data[31:16]==16'h88F7) // ether_type == ptp`
163	10	edn_walter	`ptp_l2 <= 1'b1;`
164			`// check if it is L4 PTP`
165	29	edn_walter	`if (int_valid && bypass_udp_cnt==10'd0 && bypass_udp &&`
166			`(int_data[31:16]==16'h013f \|\| int_data[31:16]==16'h0140)) // udp_dest_port == ptp_event \|\| ptp_general`
167	10	edn_walter	`ptp_l4 <= 1'b1;`
168
169			`// check if it is PTP Event message`
170	35	edn_walter	`if (int_valid && (int_cnt==10'd3 \|\| bypass_vlan && int_cnt==10'd4) && int_data[31:16]==16'h88F7 &&`
171	29	edn_walter	`(int_data[11: 8]== 4'h0 \|\| int_data[11:8]==4'h2)) // ptp_message_id == sync \|\| delay_req`
172	10	edn_walter	`ptp_event <= 1'b1;`
173	35	edn_walter	`else if (int_valid && int_cnt==10'd4 && bypass_udp_cnt==10'd1 && ptp_l4 &&`
174	29	edn_walter	`(int_data[11: 8]== 4'h0 \|\| int_data[11:8]==4'h2)) // ptp_message_id == sync \|\| delay_req`
175	10	edn_walter	`ptp_event <= 1'b1;`
176			`end`
177			`end`
178
179	29	edn_walter	`// ptp message`
180			`reg [31:0] ptp_data;`
181	10	edn_walter	`always @(posedge rst or posedge clk) begin`
182			`if (rst) begin`
183	29	edn_walter	`ptp_data <= 32'd0;`
184	7	edn_walter	`ptp_msgid <= 4'd0;`
185	8	edn_walter	`ptp_seqid <= 16'd0;`
186	4	ash_riple	`end`
187	29	edn_walter	`else if (int_valid && int_sop) begin`
188			`ptp_data <= 32'd0;`
189	7	edn_walter	`ptp_msgid <= 4'd0;`
190	8	edn_walter	`ptp_seqid <= 16'd0;`
191	4	ash_riple	`end`
192			`else begin`
193	10	edn_walter	`// get PTP identification information as additional information to Timestamp`
194	29	edn_walter	`// ptp message body`
195			`if (int_valid && (ptp_l2 \|\| (bypass_udp_cnt>=10'd2 && ptp_l4)))`
196			`ptp_data <= {int_data_d1[15:0], int_data[31:16]};`
197	10	edn_walter	`// message id`
198	29	edn_walter	`if (int_valid && ptp_cnt==10'd1)`
199			`ptp_msgid <= ptp_data[27:24];`
200	10	edn_walter	`// sequence id`
201	29	edn_walter	`if (int_valid && ptp_cnt==10'd8)`
202			`ptp_seqid <= ptp_data[15:0];`
203	4	ash_riple	`end`
204			`end`
205
206	29	edn_walter	`// parser output`
207	4	ash_riple	`always @(posedge rst or posedge clk) begin`
208			`if (rst) begin`
209			`ptp_found <= 1'b0;`
210	27	edn_walter	`ptp_infor <= 20'd0;`
211	4	ash_riple	`end`
212	29	edn_walter	`else if (int_valid && int_sop) begin`
213	4	ash_riple	`ptp_found <= 1'b0;`
214	27	edn_walter	`ptp_infor <= 20'd0;`
215	4	ash_riple	`end`
216	29	edn_walter	`else if (int_valid && ptp_cnt==10'd9) begin`
217	4	ash_riple	`ptp_found <= ptp_event;`
218	29	edn_walter	`ptp_infor <= {ptp_msgid, ptp_seqid}; // 4+16`
219	4	ash_riple	`end`
220			`end`
221
222			`endmodule`

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