Length hacked a little less, hack window size

hw/super6502_fpga/src/sub/network_processor/src/tcp_packet_generator.sv

@@ -4,6 +4,7 @@ module tcp_packet_generator (
 
     axis_intf.SLAVE         s_axis_data,
 
+    input  wire [15:0]      i_ip_len,
     input  wire [31:0]      i_seq_number,
     input  wire [31:0]      i_ack_number,
     input  wire [15:0]      i_source_port,
@@ -50,7 +51,7 @@ always_comb begin
                 m_ip.ip_hdr_valid   = '1;
                 m_ip.ip_dscp        = '0;
                 m_ip.ip_ecn         = '0;
-                m_ip.ip_length      = 16'd40;
+                m_ip.ip_length      = i_ip_len;
                 m_ip.ip_ttl         = '1;
                 m_ip.ip_protocol    = 8'h6;
                 m_ip.ip_source_ip   = i_src_ip;
@@ -86,7 +87,7 @@ always_comb begin
                 17: m_ip.ip_payload_axis_tdata = checksum[7:0];
                 18: m_ip.ip_payload_axis_tdata = '0;
                 19: begin
-                    m_ip.ip_payload_axis_tdata = '1;
+                    m_ip.ip_payload_axis_tdata = '0;
                     m_ip.ip_payload_axis_tlast = '1;
                 end
             endcase

hw/super6502_fpga/src/sub/network_processor/src/tcp_stream.sv

@@ -47,6 +47,7 @@ tcp_pkg::rx_msg_t rx_msg;
 logic rx_msg_valid;
 logic rx_msg_ack;
 
+logic [15:0]         w_tx_ip_len;
 logic [31:0]         w_tx_seq_number;
 logic [31:0]         w_tx_ack_number;
 logic [7:0]          w_tx_flags;
@@ -177,6 +178,7 @@ tcp_tx_ctrl u_tcp_tx_ctrl (
     .i_tx_ctrl_valid            (tx_ctrl_valid),
     .o_tx_ctrl_ack              (tx_ctrl_ack),
 
+    .o_ip_len                   (w_tx_ip_len),
     .o_seq_number               (w_tx_seq_number),
     // .o_ack_number               (w_tx_ack_number),
     .o_flags                    (w_tx_flags),
@@ -193,6 +195,7 @@ tcp_packet_generator u_tcp_packet_generator (
 
     .s_axis_data                (m2s_post_saf_axis),
 
+    .i_ip_len                   (w_tx_ip_len),
     .i_seq_number               (w_tx_seq_number),
     .i_ack_number               (w_tx_ack_number),
     .i_source_port              (hwif_out.source_port.d.value),

hw/super6502_fpga/src/sub/network_processor/src/tcp_tx_ctrl.sv

@@ -8,6 +8,7 @@ module tcp_tx_ctrl(
     input  logic                i_tx_ctrl_valid,
     output logic                o_tx_ctrl_ack,
 
+    output logic [15:0]         o_ip_len,
     output logic [31:0]         o_seq_number,
     output logic [31:0]         o_ack_number,
     output logic [7:0]          o_flags,
@@ -26,23 +27,31 @@ localparam FLAG_URG = (1 << 5);
 localparam FLAG_ECE = (1 << 6);
 localparam FLAG_CWR = (1 << 7);
 
+logic [31:0] seq_num, seq_num_next;
+assign o_seq_number = seq_num;
+
 enum logic [2:0] {IDLE, SEND_SYN, SEND_ACK} state, state_next;
 
 always_ff @(posedge i_clk) begin
     if (i_rst) begin
         state <= IDLE;
+        seq_num <= '0;
     end else begin
         state <= state_next;
+        seq_num <= seq_num_next;
     end
 end
 
 always_comb begin
-    o_seq_number    = '0;
     o_ack_number    = '0;
     o_flags         = '0;
-    o_window_size   = '0;
+    o_window_size   = 16'b1;
     o_hdr_valid     = '0;
 
+    seq_num_next = seq_num;
+
+    o_ip_len        = 16'd40;   // default length of IP packet
+
     case (state)
         IDLE: begin
             if (i_tx_ctrl_valid) begin
@@ -61,6 +70,7 @@ always_comb begin
 
             if (i_packet_done) begin
                 state_next = IDLE;
+                seq_num_next = seq_num + 1;
             end
         end
 
@@ -70,6 +80,7 @@ always_comb begin
 
             if (i_packet_done) begin
                 state_next = IDLE;
+                seq_num_next = seq_num + 1;
             end
         end
     endcase