Set udp total length based on stats type instead of using default value

applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd

@@ -155,7 +155,7 @@ PACKAGE sdp_pkg is
   CONSTANT c_sdp_xst_udp_src_port_15_8  : STD_LOGIC_VECTOR(7 DOWNTO 0) := x"D2";  -- TBC
 
   CONSTANT c_sdp_stat_nof_hdr_fields : NATURAL := 1+3+12+4+20+1; -- 608b; 19 32b words
-  CONSTANT c_sdp_stat_hdr_field_sel  : STD_LOGIC_VECTOR(c_sdp_stat_nof_hdr_fields-1 DOWNTO 0) := "1"&"101"&"111111111001"&"0111"&"0100"&"000000000"&"0000100"&"0";  -- 0=data path, 1=MM controlled TODO
+  CONSTANT c_sdp_stat_hdr_field_sel  : STD_LOGIC_VECTOR(c_sdp_stat_nof_hdr_fields-1 DOWNTO 0) := "1"&"101"&"111111111001"&"0101"&"0100"&"000000000"&"0000100"&"0";  -- 0=data path, 1=MM controlled TODO
 --CONSTANT c_sdp_stat_hdr_field_sel  : STD_LOGIC_VECTOR(c_sdp_stat_nof_hdr_fields-1 DOWNTO 0) := "0"&"100"&"000000010001"&"0100"&"0100"&"000000010"&"1000000"&"0";  -- 0=data path, 1=MM controlled TODO
 
   CONSTANT c_sdp_stat_hdr_field_arr : t_common_field_arr(c_sdp_stat_nof_hdr_fields-1 DOWNTO 0) := (
@@ -179,7 +179,7 @@ PACKAGE sdp_pkg is
 
       ( field_name_pad("udp_src_port"                            ), "RW", 16, field_default(0) ), 
       ( field_name_pad("udp_dst_port"                            ), "RW", 16, field_default(5001) ), 
-      ( field_name_pad("udp_total_length"                        ), "RW", 16, field_default(4136) ), 
+      ( field_name_pad("udp_total_length"                        ), "RW", 16, field_default(0) ), 
       ( field_name_pad("udp_checksum"                            ), "RW", 16, field_default(0) ),
 
       ( field_name_pad("sdp_marker"                              ), "RW",  8, field_default(0) ),

applications/lofar2/libraries/sdp/src/vhdl/sdp_statistics_offload.vhd

@@ -101,6 +101,8 @@ ARCHITECTURE str OF sdp_statistics_offload IS
   CONSTANT c_nof_data                  : NATURAL := sel_a_b(g_statistics_type="BST",  c_sdp_N_pol * c_sdp_S_sub_bf,
                                                     sel_a_b(g_statistics_type="XST",  c_sdp_S_pn * c_sdp_S_pn * c_nof_complex, 
                                                                                       c_sdp_N_sub));  -- SST
+  CONSTANT c_udp_total_length          : NATURAL := 40 + c_nof_data * c_longword_sz;
+
   CONSTANT c_block_size                : NATURAL := c_nof_data * c_step_size;
   
   CONSTANT c_nof_packets               : NATURAL := sel_a_b(g_statistics_type="BST", 1,
@@ -163,6 +165,7 @@ BEGIN
   dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "eth_src_mac"                             ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "eth_src_mac"                             )) <= eth_src_mac;
   dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "udp_src_port"                            ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "udp_src_port"                            )) <= udp_src_port;
   dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "ip_src_addr"                             ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "ip_src_addr"                             )) <= ip_src_addr;
+  dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "udp_total_length"                        ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "udp_total_length"                        )) <= TO_UVEC(c_udp_total_length, 16);
   dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "sdp_marker"                              ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "sdp_marker"                              )) <= TO_UVEC(c_marker, 8);
   dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "sdp_observation_id"                      ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "sdp_observation_id"                      )) <= sdp_info.observation_id;
   dp_header_info(field_hi(c_sdp_stat_hdr_field_arr, "sdp_station_id"                          ) DOWNTO field_lo(c_sdp_stat_hdr_field_arr,  "sdp_station_id"                          )) <= sdp_info.station_id;