Send basic header

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

@@ -15,22 +15,89 @@ module tcp_packet_generator (
     input  wire [31:0]      i_src_ip,
     input  wire [31:0]      i_dst_ip,
 
+    output logic            o_packet_done,
+
     ip_intf.MASTER          m_ip
 );
 
-always_comb begin
+logic [31:0] counter, counter_next;
-    m_ip.ip_hdr_valid = '0;
+enum logic [1:0] {IDLE, HEADER, DATA} state, state_next;
 
-    if (i_hdr_valid) begin
+logic [15:0] checksum;
-        m_ip.ip_hdr_valid   = '1;
+
-        m_ip.ip_dscp        = '0;
+always_ff @(posedge i_clk) begin
-        m_ip.ip_ecn         = '0;
+    if (i_rst) begin
-        m_ip.ip_length      = '0;
+        counter <= '0;
-        m_ip.ip_ttl         = '1;
+        state <= IDLE;
-        m_ip.ip_protocol    = 8'h6;
+    end else begin
-        m_ip.ip_source_ip   = i_src_ip;
+        counter <= counter_next;
-        m_ip.ip_dest_ip     = i_dst_ip;
+        state <= state_next;
     end
 end
 
+always_comb begin
+    m_ip.ip_hdr_valid = '0;
+    o_packet_done = '0;
+
+    case (state)
+
+        IDLE: begin
+            if (i_hdr_valid) begin
+                m_ip.ip_hdr_valid   = '1;
+                m_ip.ip_dscp        = '0;
+                m_ip.ip_ecn         = '0;
+                m_ip.ip_length      = '0;
+                m_ip.ip_ttl         = '1;
+                m_ip.ip_protocol    = 8'h6;
+                m_ip.ip_source_ip   = i_src_ip;
+                m_ip.ip_dest_ip     = i_dst_ip;
+
+                if (m_ip.ip_hdr_ready) begin
+                    state_next = HEADER;
+                end
+            end
+        end
+
+        HEADER: begin
+            m_ip.ip_payload_axis_tvalid = '1;
+
+            case (counter)
+                0:  m_ip.ip_payload_axis_tdata = i_source_port[15:8];
+                1:  m_ip.ip_payload_axis_tdata = i_source_port[7:0];
+                2:  m_ip.ip_payload_axis_tdata = i_dest_port[15:8];
+                3:  m_ip.ip_payload_axis_tdata = i_dest_port[7:0];
+                4:  m_ip.ip_payload_axis_tdata = i_seq_number[31:24];
+                5:  m_ip.ip_payload_axis_tdata = i_seq_number[23:16];
+                6:  m_ip.ip_payload_axis_tdata = i_seq_number[15:8];
+                7:  m_ip.ip_payload_axis_tdata = i_seq_number[7:0];
+                8:  m_ip.ip_payload_axis_tdata = i_ack_number[31:24];
+                9:  m_ip.ip_payload_axis_tdata = i_ack_number[23:16];
+                10: m_ip.ip_payload_axis_tdata = i_ack_number[15:8];
+                11: m_ip.ip_payload_axis_tdata = i_ack_number[7:0];
+                12: m_ip.ip_payload_axis_tdata = '0;
+                13: m_ip.ip_payload_axis_tdata = i_flags;
+                14: m_ip.ip_payload_axis_tdata = i_window_size[15:8];
+                15: m_ip.ip_payload_axis_tdata = i_window_size[7:0];
+                16: m_ip.ip_payload_axis_tdata = checksum[15:8];
+                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 = '0;
+                    m_ip.ip_payload_axis_tlast = '1;
+                end
+            endcase
+
+            if (m_ip.ip_payload_axis_tready) begin
+                counter_next <= counter + 1;
+
+                if (m_ip.ip_payload_axis_tlast) begin
+                    state_next = IDLE;
+                    o_packet_done = '1;
+                end
+            end
+        end
+    endcase
+
+end
+
 endmodule

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

@@ -37,7 +37,7 @@ always_ff @(posedge i_clk) begin
     if (i_rst) begin
         tcp_state <= IDLE;
     end else begin
-        if (i_enable) begin
+        if (~i_enable) begin
             tcp_state <= IDLE;
         end else begin
             tcp_state <= tcp_state_next;
@@ -48,6 +48,8 @@ end
 always_comb begin
     tcp_state_next = tcp_state;
 
+    o_tx_ctrl_valid = '0;
+
     o_tx_ctrl = TX_CTRL_NOP;
     o_tx_ctrl_valid = '0;
 

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

@@ -45,6 +45,7 @@ logic [31:0]         w_tx_ack_number;
 logic [7:0]          w_tx_flags;
 logic [15:0]         w_tx_window_size;
 logic                w_tx_hdr_valid;
+logic                w_tx_packet_done;
 
 tcp_pkg::rx_msg_t rx_msg;
 
@@ -163,7 +164,9 @@ tcp_tx_ctrl u_tcp_tx_ctrl (
     .o_ack_number               (w_tx_ack_number),
     .o_flags                    (w_tx_flags),
     .o_window_size              (w_tx_window_size),
-    .o_hdr_valid                (w_tx_hdr_valid)
+    .o_hdr_valid                (w_tx_hdr_valid),
+
+    .i_packet_done              (w_tx_packet_done)
 );
 
 // packet generator
@@ -183,6 +186,8 @@ tcp_packet_generator u_tcp_packet_generator (
     .i_src_ip                   (hwif_out.source_ip.d.value),
     .i_dst_ip                   (hwif_out.dest_ip.d.value),
 
+    .o_packet_done              (w_tx_packet_done),
+
     .m_ip                       (m_ip_tx)
 );
 

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

@@ -12,7 +12,9 @@ module tcp_tx_ctrl(
     output logic [31:0]         o_ack_number,
     output logic [7:0]          o_flags,
     output logic [15:0]         o_window_size,
-    output logic                o_hdr_valid
+    output logic                o_hdr_valid,
+
+    input  wire                 i_packet_done
 );
 
 localparam FLAG_FIN = (1 << 0);
@@ -55,6 +57,10 @@ always_comb begin
         SEND_SYN: begin
             o_flags = FLAG_SYN;
             o_hdr_valid = '1;
+
+            if (i_packet_done) begin
+                state_next = IDLE;
+            end
         end
     endcase
 end