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dinesha |
/*-----------------------------------------------------------------
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| Ethernet Traffic Generator Testbench |
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------------------------------------------------------------------*/
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/*-----------------------------------------------------------------\
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| DESCRIPTION: |
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| tb_pktgn.v: Packet generation tasks |
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| Instantiated modules: none |
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| Included files: none |
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\-----------------------------------------------------------------*/
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task construct_frame;
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integer size;
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integer payload_byte;
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reg [`MAX_PKT_SIZE*8 -1:0] packet;
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integer i,j;
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begin
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size = current_pkt_size;
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// clear packet
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packet = 0;
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add_L2_header(packet);
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if (flow_type >= 3)
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add_L3_header(packet);
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if (flow_type >= 5)
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add_L4_header(packet);
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add_payload(packet);
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transmit_pkt = packet;
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transmit_pkt_size= size;
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end
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endtask // construct_frame
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task add_L2_header;
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inout [`MAX_PKT_SIZE*8 -1:0] packet;
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reg [47:0] mac_addr;
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reg [15:0] temp;
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integer length_field, next_offset, j;
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reg [`MAX_HEADER_SIZE*8-1:0] std_LLC_header;
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begin
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if (L2_custom_header_enable) // use user-defined header
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begin
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insert_header(packet, 0, L2_custom_header,
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L2_custom_header_length);
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L3_header_position = L2_custom_header_length;
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if (flow_type < 3) // Layer-2 flow
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payload_position = L2_custom_header_length;
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end // if (L2_custom_header_enable)
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else
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begin
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mac_addr = current_dstn_mac;
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//swap bytes in MAC address
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// MS byte goes first on the link
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packet[ 7: 0] = mac_addr[47:40];
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packet[15: 8] = mac_addr[39:32];
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packet[23:16] = mac_addr[31:24];
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packet[31:24] = mac_addr[23:16];
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packet[39:32] = mac_addr[15: 8];
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packet[47:40] = mac_addr[ 7: 0];
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mac_addr = current_src_mac;
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packet[55:48] = mac_addr[47:40];
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packet[63:56] = mac_addr[39:32];
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packet[71:64] = mac_addr[31:24];
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packet[79:72] = mac_addr[23:16];
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packet[87:80] = mac_addr[15: 8];
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packet[95:88] = mac_addr[ 7: 0];
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length_field = current_pkt_size - 6*2 - 2 -4; // SA, DA, length, CRC
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next_offset = 12;
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if ((L2_protocol_type == 1) ||
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(L2_protocol_type == 3)) // tagged frame
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begin // attach VLAN tag
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packet[103:96] = (L2_VLAN_TPID >> 8) & 8'hff;
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packet[111:104] = L2_VLAN_TPID & 8'hff;
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temp = current_VLAN_TCI;
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packet[119:112] = temp[15:8];
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packet[127:120] = temp[7:0];
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length_field = length_field -4;
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next_offset = next_offset +4;
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end
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// set type-length field
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if ((L2_protocol_type == 0) ||
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(L2_protocol_type == 1)) // Ethernet frame
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begin
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if (flow_type < 3) // Layer-2 flow
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temp[15:0] = L2_type_field;
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else
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case(L3_protocol_type)
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4: // IP Version 4
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temp = 16'h0800;
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6: // IP version 6
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temp = 16'h08dd;
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8: // TCP/IP ARP
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temp = 16'h0806;
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9: // IPX
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temp = 16'h8137;
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default:
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temp = 16'h0800; // default is IP Version 4
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endcase // case(L3_protocol)
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end // if ((L2_protocol_type == 0) ||...
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else
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begin // 802.3 frame
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// Allow undersize L2 frames with padding
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// by setting length field based on payload length
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if ((flow_type <= 2) // Layer-2 flow
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&& (payload_length < length_field))
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length_field = payload_length;
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temp[15:0] = length_field[15:0];
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end // else: !if((L2_protocol_type == 0) ||...
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for (i=0; i<8; i=i+1)
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packet[next_offset*8 +i] = temp[8+i];
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next_offset = next_offset+1;
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for (i=0; i<8; i=i+1)
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packet[next_offset*8 +i] = temp[i];
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next_offset = next_offset+1;
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// set LLC header for 802.3 frames
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if ((L2_protocol_type == 2) ||
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(L2_protocol_type == 3)) // 802.3 frame
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begin
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std_LLC_header[63:48] = 16'haaaa; //DSAP and SSAP
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std_LLC_header[47:40] = 8'd3; // control
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std_LLC_header[39:16] = 24'd0; // org code
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// set type field
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if (flow_type < 3) // Layer-2 flow
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std_LLC_header[15:0] = L2_type_field;
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else
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case(L3_protocol_type)
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4: // IP Version 4
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std_LLC_header[15:0] = 16'h0800;
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6: // IP version 6
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std_LLC_header[15:0] = 16'h08dd;
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8: // TCP/IP ARP
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std_LLC_header[15:0] = 16'h0806;
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9: // IPX
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std_LLC_header[15:0] = 16'h8137;
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default:
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std_LLC_header[15:0] = 16'h0800; // default is IPv4
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endcase // case(L3_protocol)
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if (L2_LLC_header_enable) // use user-defined header
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begin
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insert_header(packet, next_offset, L2_LLC_header,
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L2_LLC_header_length);
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next_offset = next_offset + L2_LLC_header_length;
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end // if (L2_LLC_header_enable)
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else
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begin
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insert_header(packet, next_offset, std_LLC_header, 8);
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next_offset = next_offset + 8;
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end // else: !if(L2_LLC_header_enable)
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end // if ((L2_protocol_type == 2) ||...
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L3_header_position = next_offset;
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if (flow_type < 3) // Layer-2 flow
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payload_position = next_offset;
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end // else: !if(L2_custom_header_enable)
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end
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endtask // add_L2_header
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task add_L3_header;
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inout [`MAX_PKT_SIZE*8 -1:0] packet;
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reg [`MAX_HEADER_SIZE*8-1:0] L3_header;
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integer length;
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reg [31:0] x;
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begin
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if (L3_custom_header_enable) // use user-defined header
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begin
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insert_header(packet, L3_header_position, L3_custom_header,
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L3_custom_header_length);
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L4_header_position = L3_header_position + L3_custom_header_length;
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if (flow_type < 5) // Layer-4 flow
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payload_position = L4_header_position;
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end // if (L3_custom_header_enable)
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else
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begin
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case (L3_protocol_type)
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4: // IP Version 4
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begin
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L3_header[159:156] = 4'h4;// Version = 4
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L3_header[155:152] = 4'd5 + IP_ext_header_length/4;
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// size of datagram
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L3_header[151:144] = IP_service_type;// TOS field
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// Determine length of datagram
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length = current_pkt_size - L3_header_position -4; // leave 4 bytes for CRC
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// check payload length defined by user
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if (flow_type >= 5) // Layer-4 flow
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begin
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if (L4_protocol_type == 1) // UDP, header length = 8 bytes
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begin
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if ((payload_length + 20 + IP_ext_header_length + 8)
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< length)
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length = payload_length + 20 + IP_ext_header_length + 8;
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end // if (L4_protocol_type == 1)
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else // TCP, header length = 20 bytes
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begin
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if ((payload_length + 20 + IP_ext_header_length + 20) < length)
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length = payload_length + 20 + IP_ext_header_length + 20;
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end // else: !if(L4_protocol_type == 1)
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end // if (flow_type >= 5)
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else // Layer-3 flow
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if ((payload_length + 20 + IP_ext_header_length) < length)
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length = payload_length + 20 + IP_ext_header_length;
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L3_header[143:128] = length[15:0];
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L3_header[127:112] = L3_sequence_number[15:0]; //IP sequence number
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L3_sequence_number = L3_sequence_number+1;
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L3_header[111:109] = IP_flags[2:0]; // IP flags
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L3_header[108:96] = IP_fragment_offset[12:0]; // fragment offset
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L3_header[95:88] = L3_TTL[7:0]; // IP time to live
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L3_header[87:80] = IP_protocol_field[7:0]; // L4 protocol
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// If flow is defined as Layer-4 set protocol field
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// according to the L4 protocol defined
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if (flow_type >= 5) // Layer-4 flow
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case(L4_protocol_type)
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0: // TCP
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L3_header[87:80] = 8'h06;
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1: // UDP
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L3_header[87:80] = 8'h11;
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endcase // case(L4_protocol_type)
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L3_header[79:64] = 16'h0; // reset IP checksum
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L3_header[63:32] = L3_src_address;
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L3_header[31:0] = L3_dstn_address;
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// calculate IP checksum
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L3_header[79:64] = IP_checksum(L3_header, 20);
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// insert IP header in packet
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insert_header(packet, L3_header_position, L3_header, 20);
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// insert IP extension header
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if (IP_ext_header_length != 0)
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insert_header(packet, L3_header_position + 20,
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IP_ext_header, IP_ext_header_length);
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L4_header_position = L3_header_position + 20 +
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IP_ext_header_length;
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payload_position = L4_header_position;
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end // case: 4
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default:
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begin
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L4_header_position = L3_header_position;
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payload_position = L4_header_position;
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end // case: default
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endcase // case(L3_protocol_type)
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end // else: !if(L3_custom_header_enable)
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end
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endtask // add_L3_header
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| 259 |
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task add_L4_header;
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inout [`MAX_PKT_SIZE*8 -1:0] packet;
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reg [`MAX_HEADER_SIZE*8-1:0] L4_header;
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| 263 |
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integer length;
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| 264 |
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| 265 |
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begin
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| 266 |
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if (L4_custom_header_enable) // use user-defined header
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| 267 |
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begin
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| 268 |
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insert_header(packet, L4_header_position, L4_custom_header,
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| 269 |
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L4_custom_header_length);
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| 270 |
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payload_position = L4_header_position + L4_custom_header_length;
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| 271 |
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end // if (L4_custom_header_enable)
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| 272 |
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else
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| 273 |
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begin
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| 274 |
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case(L4_protocol_type)
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| 275 |
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| 276 |
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1: begin // UDP, header size = 8 bytes
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| 277 |
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L4_header[63:48] = L4_src_port;
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| 278 |
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L4_header[47:32] = L4_dstn_port;
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| 279 |
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| 280 |
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// Determine length field
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| 281 |
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length = current_pkt_size - L4_header_position -4; // leave 4 bytes for CRC
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| 282 |
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// check payload length defined by user
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| 283 |
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if ((payload_length + 8) < length)
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| 284 |
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length = payload_length + 8;
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| 285 |
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| 286 |
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L4_header[31:16] = length[15:0];
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| 287 |
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L4_header[15:0] = 0; // calculate checksum later after constructing payload
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| 288 |
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| 289 |
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insert_header(packet, L4_header_position, L4_header, 8);
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| 290 |
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payload_position = L4_header_position + 8;
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| 291 |
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end
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| 292 |
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| 293 |
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default: begin // TCP, header size = 20 bytes
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| 294 |
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| 295 |
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L4_header[159:144] = L4_src_port;
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| 296 |
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L4_header[143:128] = L4_dstn_port;
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| 297 |
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L4_header[127:96] = L4_sequence_number;
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| 298 |
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L4_header[95:64] = L4_ack_number;
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| 299 |
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L4_header[63:60] = 4'd5; // length of header in 32-bit words
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| 300 |
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L4_header[59:54] = 6'd0; // reserved field
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| 301 |
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L4_header[53:48] = TCP_flags;
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| 302 |
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L4_header[47:32] = TCP_window_size;
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| 303 |
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L4_header[31:16] = 16'd0; // calculate checksum later
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| 304 |
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L4_header[15:0] = TCP_urgent_pointer; // calculate checksum later
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| 305 |
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insert_header(packet, L4_header_position, L4_header, 20);
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| 306 |
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payload_position = L4_header_position + 20;
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| 307 |
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| 308 |
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// update TCP sequence number
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| 309 |
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length = current_pkt_size - payload_position - 4; // leave 4 bytes for CRC
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| 310 |
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if (payload_length < length)
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| 311 |
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length = payload_length;
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| 312 |
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L4_sequence_number = L4_sequence_number + length;
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| 313 |
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end // case: default
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| 314 |
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endcase // case(L4_protocol_type)
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| 315 |
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end // else: !if(L4_custom_header_enable)
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| 316 |
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end
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endtask // add_L4_header
|
| 318 |
|
|
|
| 319 |
|
|
task add_payload;
|
| 320 |
|
|
inout [`MAX_PKT_SIZE*8 -1:0] packet;
|
| 321 |
|
|
|
| 322 |
|
|
integer length, checksum_position, i, j;
|
| 323 |
|
|
reg [31:0] x;
|
| 324 |
|
|
reg [7:0] payload_byte;
|
| 325 |
|
|
reg [15:0] next_word;
|
| 326 |
|
|
reg [31:0] checksum;
|
| 327 |
|
|
|
| 328 |
|
|
begin
|
| 329 |
|
|
|
| 330 |
|
|
length = current_pkt_size - payload_position;
|
| 331 |
|
|
if (flowrec_crc_option != 2'b10)
|
| 332 |
|
|
length = length - 4; // leave 4 bytes for CRC
|
| 333 |
|
|
if (payload_length < length)
|
| 334 |
|
|
length = payload_length;
|
| 335 |
|
|
case(payload_option)
|
| 336 |
|
|
0: begin // increasing sequence of bytes
|
| 337 |
|
|
payload_byte = payload_start;
|
| 338 |
|
|
for (i = payload_position; i < (payload_position+length); i = i+1)
|
| 339 |
|
|
begin
|
| 340 |
|
|
for (j=0; j<8; j=j+1)
|
| 341 |
|
|
packet[i*8 +j] = payload_byte[j];
|
| 342 |
|
|
payload_byte = payload_byte +1;
|
| 343 |
|
|
end // for (i = payload_position; i < (payload_position+length); i = i+1)
|
| 344 |
|
|
end // case: 0
|
| 345 |
|
|
|
| 346 |
|
|
1: begin // decreasing sequence of bytes
|
| 347 |
|
|
payload_byte = payload_start;
|
| 348 |
|
|
for (i = payload_position; i < (payload_position+length); i = i+1)
|
| 349 |
|
|
begin
|
| 350 |
|
|
for (j=0; j<8; j=j+1)
|
| 351 |
|
|
packet[i*8 +j] = payload_byte[j];
|
| 352 |
|
|
payload_byte = payload_byte -1;
|
| 353 |
|
|
end // for (i = payload_position; i < (payload_position+length); i = i+1)
|
| 354 |
|
|
end // case: 1
|
| 355 |
|
|
|
| 356 |
|
|
2: begin // random payload
|
| 357 |
|
|
for (i = payload_position; i < (payload_position+length); i = i+1)
|
| 358 |
|
|
begin
|
| 359 |
|
|
x = $random();
|
| 360 |
|
|
for (j=0; j<8; j=j+1)
|
| 361 |
|
|
packet[i*8 +j] = x[j];
|
| 362 |
|
|
end // for (i = payload_position; i < (payload_position+length); i = i+1)
|
| 363 |
|
|
end // case: 2
|
| 364 |
|
|
|
| 365 |
|
|
3: begin // user-defined payload
|
| 366 |
|
|
for (i=0; i < length; i = i+1)
|
| 367 |
|
|
for (j=0; j < 8; j= j+1)
|
| 368 |
|
|
packet[(payload_position+i)*8 +j] = user_payload[(length-i-1)*8 +j];
|
| 369 |
|
|
end // case: 3
|
| 370 |
|
|
endcase // case(payload_option)
|
| 371 |
|
|
|
| 372 |
|
|
// for TCP and UDP flows, update L4 checksum
|
| 373 |
|
|
if (flow_type >= 5)
|
| 374 |
|
|
begin
|
| 375 |
|
|
if (L4_protocol_type == 1) // UDP
|
| 376 |
|
|
checksum_position = L4_header_position + 6; // position of checksum in pkt
|
| 377 |
|
|
else // TCP
|
| 378 |
|
|
checksum_position = L4_header_position + 16;
|
| 379 |
|
|
|
| 380 |
|
|
// determine length of packet, including TCP/UDP header
|
| 381 |
|
|
length = current_pkt_size - payload_position - 4; // leave 4 bytes for CRC
|
| 382 |
|
|
if (payload_length < length)
|
| 383 |
|
|
length = payload_length;
|
| 384 |
|
|
if (L4_protocol_type == 1) // UDP
|
| 385 |
|
|
length = length + 8;
|
| 386 |
|
|
else // TCP
|
| 387 |
|
|
length = length + 20;
|
| 388 |
|
|
|
| 389 |
|
|
// calculate checksum
|
| 390 |
|
|
checksum[31:0] = 32'd0;
|
| 391 |
|
|
for (i=0; i < length; i = i+2)
|
| 392 |
|
|
begin
|
| 393 |
|
|
next_word[15:8] = 0;
|
| 394 |
|
|
for (j=0; j < 8; j= j+1)
|
| 395 |
|
|
next_word[8+j] = packet[(L4_header_position+i)*8 +j];
|
| 396 |
|
|
// if length is an odd number of bytes, pad last byte with zeroes
|
| 397 |
|
|
next_word[7:0] = 0;
|
| 398 |
|
|
if ((i+1) < length)
|
| 399 |
|
|
for (j=0; j < 8; j= j+1)
|
| 400 |
|
|
next_word[j] = packet[(L4_header_position+i+1)*8 +j];
|
| 401 |
|
|
checksum = checksum + {16'd0, next_word[15:0]};
|
| 402 |
|
|
end // for (i=0; i < length; i = i+2)
|
| 403 |
|
|
// add pseudo header
|
| 404 |
|
|
checksum = checksum +
|
| 405 |
|
|
{16'd0, L3_src_address[31:16]} +
|
| 406 |
|
|
{16'd0, L3_src_address[15:0]} +
|
| 407 |
|
|
{16'd0, L3_dstn_address[31:16]} +
|
| 408 |
|
|
{16'd0, L3_dstn_address[15:0]};
|
| 409 |
|
|
if (L4_protocol_type == 1) // UDP
|
| 410 |
|
|
checksum = checksum + 32'h00000011 // protocol = 17
|
| 411 |
|
|
+ {16'd0, length[15:0]};
|
| 412 |
|
|
// length field from UDP header
|
| 413 |
|
|
else // TCP
|
| 414 |
|
|
checksum = checksum + 32'h00000006 // protocol = 6
|
| 415 |
|
|
+ {16'd0, length[15:0]}; // length of payload + TCP header
|
| 416 |
|
|
|
| 417 |
|
|
// add "end-around carry"
|
| 418 |
|
|
checksum = checksum + {16'd0, checksum[31:16]};
|
| 419 |
|
|
|
| 420 |
|
|
if (checksum[15:0] == 16'd0) // complement checksum
|
| 421 |
|
|
checksum[15:0] = 16'hffff;
|
| 422 |
|
|
|
| 423 |
|
|
case(L4_checksum_option)
|
| 424 |
|
|
0: // calculate good checksum
|
| 425 |
|
|
begin
|
| 426 |
|
|
// nothing to do
|
| 427 |
|
|
end // case: 0
|
| 428 |
|
|
|
| 429 |
|
|
1: // generate bad checksum
|
| 430 |
|
|
begin
|
| 431 |
|
|
x = $random();
|
| 432 |
|
|
if (x[15:0] == checksum[15:0]) // if we got correct checksum by accident
|
| 433 |
|
|
x[15] = ~x[15]; //invert MS bit;
|
| 434 |
|
|
checksum[15:0] = x[15:0];
|
| 435 |
|
|
end // case: 1
|
| 436 |
|
|
|
| 437 |
|
|
2: // set checksum to zero
|
| 438 |
|
|
checksum[15:0] = 16'd0;
|
| 439 |
|
|
|
| 440 |
|
|
3: // set checksum to user-defined value
|
| 441 |
|
|
checksum[15:0] = L4_user_checksum;
|
| 442 |
|
|
endcase // case(L4_checksum_option)
|
| 443 |
|
|
|
| 444 |
|
|
// insert checkum in L4 header
|
| 445 |
|
|
for (j=0; j < 8; j= j+1)
|
| 446 |
|
|
packet[checksum_position*8 +j] = checksum[8+j];
|
| 447 |
|
|
for (j=0; j < 8; j= j+1)
|
| 448 |
|
|
packet[(checksum_position +1)*8 +j] = checksum[j];
|
| 449 |
|
|
end // if (flow_type >= 5)
|
| 450 |
|
|
end
|
| 451 |
|
|
endtask // add_payload
|
| 452 |
|
|
|
| 453 |
|
|
task insert_header;
|
| 454 |
|
|
inout [`MAX_PKT_SIZE*8 -1:0] packet;
|
| 455 |
|
|
input offset;
|
| 456 |
|
|
input [`MAX_HEADER_SIZE*8-1:0] header;
|
| 457 |
|
|
input length;
|
| 458 |
|
|
integer offset, length;
|
| 459 |
|
|
integer i,j;
|
| 460 |
|
|
begin
|
| 461 |
|
|
if (length != 0)
|
| 462 |
|
|
for (i=0; i < length; i = i+1)
|
| 463 |
|
|
for (j=0; j < 8; j= j+1)
|
| 464 |
|
|
packet[(offset+i)*8 +j] = header[(length-i-1)*8 +j];
|
| 465 |
|
|
end
|
| 466 |
|
|
endtask // insert_header
|
| 467 |
|
|
|
| 468 |
|
|
task construct_pause_frame;
|
| 469 |
|
|
// Constructs an 802.3x PAUSE frame
|
| 470 |
|
|
input [47:0] src_mac;
|
| 471 |
|
|
input [15:0] pause_time;
|
| 472 |
|
|
output [`MAX_PKT_SIZE*8 -1:0] packet;
|
| 473 |
|
|
output size;
|
| 474 |
|
|
integer i,j, size;
|
| 475 |
|
|
|
| 476 |
|
|
reg [47:0] mac_addr;
|
| 477 |
|
|
reg [15:0] temp;
|
| 478 |
|
|
begin
|
| 479 |
|
|
size = 64;
|
| 480 |
|
|
// clear packet
|
| 481 |
|
|
packet = 0;
|
| 482 |
|
|
// construct header;
|
| 483 |
|
|
mac_addr = `PAUSE_DEST_MAC;
|
| 484 |
|
|
//swap bytes in MAC address
|
| 485 |
|
|
// MS byte goes first on the link
|
| 486 |
|
|
packet[ 7: 0] = mac_addr[47:40];
|
| 487 |
|
|
packet[15: 8] = mac_addr[39:32];
|
| 488 |
|
|
packet[23:16] = mac_addr[31:24];
|
| 489 |
|
|
packet[31:24] = mac_addr[23:16];
|
| 490 |
|
|
packet[39:32] = mac_addr[15: 8];
|
| 491 |
|
|
packet[47:40] = mac_addr[ 7: 0];
|
| 492 |
|
|
|
| 493 |
|
|
mac_addr = src_mac;
|
| 494 |
|
|
packet[55:48] = mac_addr[47:40];
|
| 495 |
|
|
packet[63:56] = mac_addr[39:32];
|
| 496 |
|
|
packet[71:64] = mac_addr[31:24];
|
| 497 |
|
|
packet[79:72] = mac_addr[23:16];
|
| 498 |
|
|
packet[87:80] = mac_addr[15: 8];
|
| 499 |
|
|
packet[95:88] = mac_addr[ 7: 0];
|
| 500 |
|
|
|
| 501 |
|
|
// set type-length field
|
| 502 |
|
|
temp = `PAUSE_TYPE;
|
| 503 |
|
|
packet[103:96] = temp[15:8];
|
| 504 |
|
|
packet[111:104] = temp[7:0];
|
| 505 |
|
|
// set PAUSE opcode
|
| 506 |
|
|
temp = `PAUSE_OPCODE;
|
| 507 |
|
|
packet[119:112] = temp[15:8];
|
| 508 |
|
|
packet[127:120] = temp[7:0];
|
| 509 |
|
|
|
| 510 |
|
|
// set pause parameter
|
| 511 |
|
|
temp = pause_time;
|
| 512 |
|
|
packet[135:128] = temp[15:8];
|
| 513 |
|
|
packet[143:136] = temp[7:0];
|
| 514 |
|
|
end
|
| 515 |
|
|
endtask // construct_pause_frame
|
| 516 |
|
|
|
| 517 |
|
|
function [15:0] IP_checksum;
|
| 518 |
|
|
input [`MAX_PKT_SIZE*8 -1:0] header;
|
| 519 |
|
|
input length;
|
| 520 |
|
|
integer length;
|
| 521 |
|
|
reg [31:0] checksum;
|
| 522 |
|
|
reg [15:0] next_word;
|
| 523 |
|
|
integer i, j;
|
| 524 |
|
|
reg [31:0] x;
|
| 525 |
|
|
|
| 526 |
|
|
begin
|
| 527 |
|
|
// compute header checksum
|
| 528 |
|
|
checksum[31:0] = 32'd0;
|
| 529 |
|
|
for (i=0; i< length/2; i=i+1)
|
| 530 |
|
|
begin
|
| 531 |
|
|
for (j=0; j<16; j=j+1)
|
| 532 |
|
|
next_word[j] = header[i*16 +j]; // get next 16 bits
|
| 533 |
|
|
checksum = checksum + {16'd0, next_word[15:0]};
|
| 534 |
|
|
end // for (j=0; j<16; j=j+1)
|
| 535 |
|
|
|
| 536 |
|
|
// include IP extension header, if present
|
| 537 |
|
|
if (IP_ext_header_length != 0)
|
| 538 |
|
|
begin
|
| 539 |
|
|
for (i=0; i< IP_ext_header_length/2; i=i+1)
|
| 540 |
|
|
begin
|
| 541 |
|
|
for (j=0; j<16; j=j+1)
|
| 542 |
|
|
next_word[j] = IP_ext_header[i*16 +j]; // get next 16 bits
|
| 543 |
|
|
checksum = checksum + {16'd0, next_word[15:0]};
|
| 544 |
|
|
end // for (j=0; j<16; j=j+1)
|
| 545 |
|
|
end // if (IP_ext_header_length != 0)
|
| 546 |
|
|
|
| 547 |
|
|
// add "end-around carry"
|
| 548 |
|
|
checksum = checksum + {16'd0, checksum[31:16]};
|
| 549 |
|
|
|
| 550 |
|
|
case (L3_checksum_option)
|
| 551 |
|
|
0: // calculate good checksum
|
| 552 |
|
|
begin
|
| 553 |
|
|
IP_checksum = ~checksum[15:0];
|
| 554 |
|
|
end // case: 0
|
| 555 |
|
|
|
| 556 |
|
|
1: // generate bad checksum
|
| 557 |
|
|
begin
|
| 558 |
|
|
x = $random();
|
| 559 |
|
|
if (x[15:0] == ~checksum[15:0])
|
| 560 |
|
|
// if the checksum is good by accident
|
| 561 |
|
|
x[15:0] = x[15:0] ^ 16'h8000; // complement MS bit
|
| 562 |
|
|
IP_checksum = x[15:0];
|
| 563 |
|
|
end // case: 1
|
| 564 |
|
|
|
| 565 |
|
|
2: // set checksum to zero
|
| 566 |
|
|
IP_checksum = 16'd0;
|
| 567 |
|
|
|
| 568 |
|
|
3: // set checksum to user-defined value
|
| 569 |
|
|
IP_checksum = L3_user_checksum;
|
| 570 |
|
|
endcase // case(L3_checksum_option[flow_id])
|
| 571 |
|
|
end
|
| 572 |
|
|
endfunction
|
| 573 |
|
|
|
