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Commit 7c9e2c8b authored by Reinier van der Walle's avatar Reinier van der Walle
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Added network header functions 

Added network header functions for headers without align field.
parent b4ed464b
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2 merge requests!10Update branch to latest revision,!9Resolve L2SDP-23
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libraries/base/common/src/vhdl/common_network_total_header_pkg.vhd
+ 340
− 0
View file @ 7c9e2c8b
......@@ -223,6 +223,18 @@ PACKAGE common_network_total_header_pkg IS
FUNCTION func_network_total_header_extract_udp( hdr_arr : t_network_total_header_32b_arr) RETURN t_network_udp_header;
FUNCTION func_network_total_header_extract_udp( hdr_arr : t_network_total_header_64b_arr) RETURN t_network_udp_header;
-- Combinatorial map just as above but for network packets without word align field.
FUNCTION func_network_total_header_no_align_extract_eth( hdr_arr : t_network_total_header_32b_arr) RETURN t_network_eth_header;
FUNCTION func_network_total_header_no_align_extract_eth( hdr_arr : t_network_total_header_64b_arr) RETURN t_network_eth_header;
FUNCTION func_network_total_header_no_align_extract_ip( hdr_arr : t_network_total_header_32b_arr) RETURN t_network_ip_header;
FUNCTION func_network_total_header_no_align_extract_ip( hdr_arr : t_network_total_header_64b_arr) RETURN t_network_ip_header;
FUNCTION func_network_total_header_no_align_extract_arp( hdr_arr : t_network_total_header_32b_arr) RETURN t_network_arp_packet;
FUNCTION func_network_total_header_no_align_extract_arp( hdr_arr : t_network_total_header_64b_arr) RETURN t_network_arp_packet;
FUNCTION func_network_total_header_no_align_extract_icmp(hdr_arr : t_network_total_header_32b_arr) RETURN t_network_icmp_header;
FUNCTION func_network_total_header_no_align_extract_icmp(hdr_arr : t_network_total_header_64b_arr) RETURN t_network_icmp_header;
FUNCTION func_network_total_header_no_align_extract_udp( hdr_arr : t_network_total_header_32b_arr) RETURN t_network_udp_header;
FUNCTION func_network_total_header_no_align_extract_udp( hdr_arr : t_network_total_header_64b_arr) RETURN t_network_udp_header;
-- Construct the total header array from the individual header records
FUNCTION func_network_total_header_construct_eth( eth : t_network_eth_header) RETURN t_network_total_header_32b_arr; -- sets unused words to zero
FUNCTION func_network_total_header_construct_eth( eth : t_network_eth_header) RETURN t_network_total_header_64b_arr; -- sets unused words to zero
......@@ -251,6 +263,25 @@ PACKAGE common_network_total_header_pkg IS
FUNCTION func_network_total_header_response_udp( udp_arr : t_network_total_header_32b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr;
FUNCTION func_network_total_header_response_udp( udp_arr : t_network_total_header_64b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr;
-- Construct the response total header array for a total header array without alignment bytes
FUNCTION func_network_total_header_no_align_response_eth( eth_arr : t_network_total_header_32b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr;
FUNCTION func_network_total_header_no_align_response_eth( eth_arr : t_network_total_header_64b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr;
FUNCTION func_network_total_header_no_align_response_arp( arp_arr : t_network_total_header_32b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0);
ip_addr : STD_LOGIC_VECTOR(c_network_ip_addr_w-1 DOWNTO 0))
RETURN t_network_total_header_32b_arr;
FUNCTION func_network_total_header_no_align_response_arp( arp_arr : t_network_total_header_64b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0);
ip_addr : STD_LOGIC_VECTOR(c_network_ip_addr_w-1 DOWNTO 0))
RETURN t_network_total_header_64b_arr;
FUNCTION func_network_total_header_no_align_response_ip( ip_arr : t_network_total_header_32b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr;
FUNCTION func_network_total_header_no_align_response_ip( ip_arr : t_network_total_header_64b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr;
FUNCTION func_network_total_header_no_align_response_icmp(icmp_arr : t_network_total_header_32b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr;
FUNCTION func_network_total_header_no_align_response_icmp(icmp_arr : t_network_total_header_64b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr;
FUNCTION func_network_total_header_no_align_response_udp( udp_arr : t_network_total_header_32b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr;
FUNCTION func_network_total_header_no_align_response_udp( udp_arr : t_network_total_header_64b_arr; mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr;
END common_network_total_header_pkg;
......@@ -397,6 +428,146 @@ PACKAGE BODY common_network_total_header_pkg IS
RETURN v_hdr;
END;
-- Assume the total header has NOT been padded with the word align field
-- Map the 11 32b words or 6 64b longwords from the total header to the header field records
FUNCTION func_network_total_header_no_align_extract_eth(hdr_arr : t_network_total_header_32b_arr) RETURN t_network_eth_header IS
VARIABLE v_hdr : t_network_eth_header;
BEGIN
v_hdr.dst_mac(47 DOWNTO 16) := hdr_arr(0);
v_hdr.dst_mac(15 DOWNTO 0) := hdr_arr(1)(31 DOWNTO 16);
v_hdr.src_mac(47 DOWNTO 32) := hdr_arr(1)(15 DOWNTO 0);
v_hdr.src_mac(31 DOWNTO 0) := hdr_arr(2);
v_hdr.eth_type := hdr_arr(3)(31 DOWNTO 16);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_eth(hdr_arr : t_network_total_header_64b_arr) RETURN t_network_eth_header IS
VARIABLE v_hdr : t_network_eth_header;
BEGIN
v_hdr.dst_mac := hdr_arr(0)(63 DOWNTO 16);
v_hdr.src_mac(47 DOWNTO 32) := hdr_arr(0)(15 DOWNTO 0);
v_hdr.src_mac(31 DOWNTO 0) := hdr_arr(1)(63 DOWNTO 32);
v_hdr.eth_type := hdr_arr(1)(31 DOWNTO 16);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_ip(hdr_arr : t_network_total_header_32b_arr) RETURN t_network_ip_header IS
VARIABLE v_hdr : t_network_ip_header;
BEGIN
v_hdr.version := hdr_arr(3)(15 DOWNTO 12);
v_hdr.header_length := hdr_arr(3)(11 DOWNTO 8);
v_hdr.services := hdr_arr(3)( 7 DOWNTO 0);
v_hdr.total_length := hdr_arr(4)(31 DOWNTO 16);
v_hdr.identification := hdr_arr(4)(15 DOWNTO 0);
v_hdr.flags := hdr_arr(5)(31 DOWNTO 29);
v_hdr.fragment_offset := hdr_arr(5)(28 DOWNTO 16);
v_hdr.time_to_live := hdr_arr(5)(15 DOWNTO 8);
v_hdr.protocol := hdr_arr(5)( 7 DOWNTO 0);
v_hdr.header_checksum := hdr_arr(6)(31 DOWNTO 16);
v_hdr.src_ip_addr(31 DOWNTO 16) := hdr_arr(6)(15 DOWNTO 0);
v_hdr.src_ip_addr(15 DOWNTO 0) := hdr_arr(7)(31 DOWNTO 16);
v_hdr.dst_ip_addr(31 DOWNTO 16) := hdr_arr(7)(15 DOWNTO 0);
v_hdr.dst_ip_addr(15 DOWNTO 0) := hdr_arr(8)(31 DOWNTO 16);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_ip(hdr_arr : t_network_total_header_64b_arr) RETURN t_network_ip_header IS
VARIABLE v_hdr : t_network_ip_header;
BEGIN
v_hdr.version := hdr_arr(1)(15 DOWNTO 12);
v_hdr.header_length := hdr_arr(1)(11 DOWNTO 8);
v_hdr.services := hdr_arr(1)( 7 DOWNTO 0);
v_hdr.total_length := hdr_arr(2)(63 DOWNTO 48);
v_hdr.identification := hdr_arr(2)(47 DOWNTO 32);
v_hdr.flags := hdr_arr(2)(31 DOWNTO 29);
v_hdr.fragment_offset := hdr_arr(2)(28 DOWNTO 16);
v_hdr.time_to_live := hdr_arr(2)(15 DOWNTO 8);
v_hdr.protocol := hdr_arr(2)( 7 DOWNTO 0);
v_hdr.header_checksum := hdr_arr(3)(63 DOWNTO 48);
v_hdr.src_ip_addr := hdr_arr(3)(47 DOWNTO 16);
v_hdr.dst_ip_addr(31 DOWNTO 16) := hdr_arr(3)(15 DOWNTO 0);
v_hdr.dst_ip_addr(15 DOWNTO 0) := hdr_arr(4)(63 DOWNTO 48);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_arp(hdr_arr : t_network_total_header_32b_arr) RETURN t_network_arp_packet IS
VARIABLE v_arp : t_network_arp_packet;
BEGIN
v_arp.htype := hdr_arr(3)(15 DOWNTO 0);
v_arp.ptype := hdr_arr(4)(31 DOWNTO 16);
v_arp.hlen := hdr_arr(4)(15 DOWNTO 8);
v_arp.plen := hdr_arr(4)( 7 DOWNTO 0);
v_arp.oper := hdr_arr(5)(31 DOWNTO 16);
v_arp.sha(47 DOWNTO 32) := hdr_arr(5)(15 DOWNTO 0);
v_arp.sha(31 DOWNTO 0) := hdr_arr(6);
v_arp.spa := hdr_arr(7);
v_arp.tha(47 DOWNTO 16) := hdr_arr(8);
v_arp.tha(15 DOWNTO 0) := hdr_arr(9)(31 DOWNTO 16);
v_arp.tpa(31 DOWNTO 16) := hdr_arr(9)(15 DOWNTO 0);
v_arp.tpa(15 DOWNTO 0) := hdr_arr(9)(31 DOWNTO 16);
RETURN v_arp;
END;
FUNCTION func_network_total_header_no_align_extract_arp(hdr_arr : t_network_total_header_64b_arr) RETURN t_network_arp_packet IS
VARIABLE v_arp : t_network_arp_packet;
BEGIN
v_arp.htype := hdr_arr(1)(15 DOWNTO 0);
v_arp.ptype := hdr_arr(2)(63 DOWNTO 48);
v_arp.hlen := hdr_arr(2)(47 DOWNTO 40);
v_arp.plen := hdr_arr(2)(39 DOWNTO 32);
v_arp.oper := hdr_arr(2)(31 DOWNTO 16);
v_arp.sha(47 DOWNTO 32) := hdr_arr(2)(15 DOWNTO 0);
v_arp.sha(31 DOWNTO 0) := hdr_arr(3)(63 DOWNTO 32);
v_arp.spa := hdr_arr(3)(31 DOWNTO 0);
v_arp.tha := hdr_arr(4)(63 DOWNTO 16);
v_arp.tpa(31 DOWNTO 16) := hdr_arr(4)(15 DOWNTO 0);
v_arp.tpa(15 DOWNTO 0) := hdr_arr(5)(63 DOWNTO 48);
RETURN v_arp;
END;
FUNCTION func_network_total_header_no_align_extract_icmp(hdr_arr : t_network_total_header_32b_arr) RETURN t_network_icmp_header IS
VARIABLE v_hdr : t_network_icmp_header;
BEGIN
v_hdr.msg_type := hdr_arr(8)(15 DOWNTO 8);
v_hdr.code := hdr_arr(8)( 7 DOWNTO 0);
v_hdr.checksum := hdr_arr(9)(31 DOWNTO 16);
v_hdr.id := hdr_arr(9)(15 DOWNTO 0);
v_hdr.sequence := hdr_arr(10)(31 DOWNTO 16);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_icmp(hdr_arr : t_network_total_header_64b_arr) RETURN t_network_icmp_header IS
VARIABLE v_hdr : t_network_icmp_header;
BEGIN
v_hdr.msg_type := hdr_arr(4)(47 DOWNTO 40);
v_hdr.code := hdr_arr(4)(39 DOWNTO 32);
v_hdr.checksum := hdr_arr(4)(31 DOWNTO 16);
v_hdr.id := hdr_arr(4)(15 DOWNTO 0);
v_hdr.sequence := hdr_arr(5)(63 DOWNTO 48);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_udp(hdr_arr : t_network_total_header_32b_arr) RETURN t_network_udp_header IS
VARIABLE v_hdr : t_network_udp_header;
BEGIN
v_hdr.src_port := hdr_arr(8)(15 DOWNTO 0);
v_hdr.dst_port := hdr_arr(9)(31 DOWNTO 16);
v_hdr.total_length := hdr_arr(9)(15 DOWNTO 0);
v_hdr.checksum := hdr_arr(10)(31 DOWNTO 16);
RETURN v_hdr;
END;
FUNCTION func_network_total_header_no_align_extract_udp(hdr_arr : t_network_total_header_64b_arr) RETURN t_network_udp_header IS
VARIABLE v_hdr : t_network_udp_header;
BEGIN
v_hdr.src_port := hdr_arr(4)(47 DOWNTO 32);
v_hdr.dst_port := hdr_arr(4)(31 DOWNTO 16);
v_hdr.total_length := hdr_arr(4)(15 DOWNTO 0);
v_hdr.checksum := hdr_arr(5)(63 DOWNTO 48);
RETURN v_hdr;
END;
-- Construct the total header array from the individual header records
FUNCTION func_network_total_header_construct_eth( eth : t_network_eth_header) RETURN t_network_total_header_32b_arr IS
VARIABLE v_total : t_network_total_header_32b_arr := (OTHERS=>(OTHERS=>'0'));
......@@ -713,4 +884,173 @@ PACKAGE BODY common_network_total_header_pkg IS
RETURN v_response;
END;
-- Construct the response headers for headers without word align padding
FUNCTION func_network_total_header_no_align_response_eth(eth_arr : t_network_total_header_32b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr IS
VARIABLE v_response : t_network_total_header_32b_arr;
BEGIN
-- Default
v_response := eth_arr;
-- ETH
-- . use input src mac for dst mac
v_response(0) := eth_arr(1)(15 DOWNTO 0) & eth_arr(2)(31 DOWNTO 16);
v_response(1)(31 DOWNTO 16) := eth_arr(2)(15 DOWNTO 0);
-- . force eth src mac to this node mac address (because the input dst_mac can be via eth broadcast mac)
v_response(1)(15 DOWNTO 0) := mac_addr(47 DOWNTO 32);
v_response(2) := mac_addr(31 DOWNTO 0);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_eth(eth_arr : t_network_total_header_64b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr IS
VARIABLE v_response : t_network_total_header_64b_arr;
BEGIN
-- Default
v_response := eth_arr;
-- ETH
-- . use input src mac for dst mac
v_response(0)(63 DOWNTO 16) := eth_arr(0)(15 DOWNTO 0) & eth_arr(1)(63 DOWNTO 32);
-- . force eth src mac to this node mac address (because the input dst_mac can be via eth broadcast mac)
v_response(0)(15 DOWNTO 0) := mac_addr(47 DOWNTO 32);
v_response(1)(63 DOWNTO 32) := mac_addr(31 DOWNTO 0);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_arp(arp_arr : t_network_total_header_32b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0);
ip_addr : STD_LOGIC_VECTOR(c_network_ip_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr IS
VARIABLE v_response : t_network_total_header_32b_arr;
BEGIN
-- ETH
v_response := func_network_total_header_no_align_response_eth(arp_arr, mac_addr);
-- ARP
-- . force operation arp reply
v_response(5)(15 DOWNTO 0) := TO_UVEC(c_network_arp_oper_reply, 16);
-- . force sha to this node mac address
v_response(6) := mac_addr(47 DOWNTO 16);
v_response(7)(31 DOWNTO 16) := mac_addr(15 DOWNTO 0);
-- . force spa to this node ip address
v_response(7)(15 DOWNTO 0) := ip_addr(31 DOWNTO 16);
v_response(8)(31 DOWNTO 16) := ip_addr(15 DOWNTO 0);
-- . use input sha for tha
v_response(8)(15 DOWNTO 0) := arp_arr(6)(31 DOWNTO 16);
v_response(9) := arp_arr(6)(15 DOWNTO 0) & arp_arr(7)(31 DOWNTO 16);
-- . use input spa for tpa
v_response(10) := arp_arr(7)(15 DOWNTO 0) & arp_arr(8)(31 DOWNTO 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_arp(arp_arr : t_network_total_header_64b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0);
ip_addr : STD_LOGIC_VECTOR(c_network_ip_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr IS
VARIABLE v_response : t_network_total_header_64b_arr;
BEGIN
-- ETH
v_response := func_network_total_header_no_align_response_eth(arp_arr, mac_addr);
-- ARP
-- . force operation arp reply
v_response(3)(47 DOWNTO 32) := TO_UVEC(c_network_arp_oper_reply, 16);
-- . force sha to this node mac address
v_response(3)(31 DOWNTO 0) := mac_addr(47 DOWNTO 16);
v_response(4)(63 DOWNTO 48) := mac_addr(15 DOWNTO 0);
-- . force spa to this node ip address
v_response(4)(47 DOWNTO 16) := ip_addr(31 DOWNTO 0);
-- . use input sha for tha
v_response(4)(15 DOWNTO 0) := arp_arr(3)(31 DOWNTO 16);
v_response(5)(63 DOWNTO 32) := arp_arr(3)(15 DOWNTO 0) & arp_arr(4)(63 DOWNTO 48);
-- . use input spa for tpa
v_response(5)(31 DOWNTO 0) := arp_arr(4)(47 DOWNTO 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_ip(ip_arr : t_network_total_header_32b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr IS
VARIABLE v_response : t_network_total_header_32b_arr;
BEGIN
-- ETH
v_response := func_network_total_header_no_align_response_eth(ip_arr, mac_addr);
-- IP
-- . force ip header checksum to 0
v_response(6)(31 DOWNTO 16) := TO_UVEC(0, 16);
-- . swap ip dst_addr and ip src_addr
v_response(6)(15 DOWNTO 0) := ip_arr(7)(15 DOWNTO 0);
v_response(7)(31 DOWNTO 16) := ip_arr(8)(31 DOWNTO 16);
v_response(7)(15 DOWNTO 0) := ip_arr(6)(15 DOWNTO 0);
v_response(8)(31 DOWNTO 16) := ip_arr(7)(31 DOWNTO 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_ip(ip_arr : t_network_total_header_64b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr IS
VARIABLE v_response : t_network_total_header_64b_arr;
BEGIN
-- ETH
v_response := func_network_total_header_no_align_response_eth(ip_arr, mac_addr);
-- IP
-- . force ip header checksum to 0
v_response(3)(63 DOWNTO 48) := TO_UVEC(0, 16);
-- . swap ip dst_addr and ip src_addr
v_response(3)(47 DOWNTO 16) := ip_arr(3)(15 DOWNTO 0) & ip_arr(4)(63 DOWNTO 48);
v_response(3)(15 DOWNTO 0) := ip_arr(3)(47 DOWNTO 32);
v_response(4)(63 DOWNTO 48) := ip_arr(3)(31 DOWNTO 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_icmp(icmp_arr : t_network_total_header_32b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr IS
VARIABLE v_response : t_network_total_header_32b_arr;
BEGIN
-- ETH, IP
v_response := func_network_total_header_no_align_response_ip(icmp_arr, mac_addr);
-- ICMP : force type to icmp reply
v_response(8)(15 DOWNTO 8) := TO_UVEC(c_network_icmp_msg_type_reply, 8);
-- ICMP : force icmp checksum to 0
v_response(9)(31 DOWNTO 16) := TO_UVEC(0, 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_icmp(icmp_arr : t_network_total_header_64b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr IS
VARIABLE v_response : t_network_total_header_64b_arr;
BEGIN
-- ETH, IP
v_response := func_network_total_header_no_align_response_ip(icmp_arr, mac_addr);
-- ICMP : force type to icmp reply
v_response(4)(47 DOWNTO 40) := TO_UVEC(c_network_icmp_msg_type_reply, 8);
-- ICMP : force icmp checksum to 0
v_response(4)(31 DOWNTO 16) := TO_UVEC(0, 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_udp(udp_arr : t_network_total_header_32b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_32b_arr IS
VARIABLE v_response : t_network_total_header_32b_arr;
BEGIN
-- ETH, IP
v_response := func_network_total_header_no_align_response_ip(udp_arr, mac_addr);
-- UDP : swap udp dst port and udp src port
v_response(9) := udp_arr(9)(15 DOWNTO 0) & udp_arr(9)(31 DOWNTO 16);
-- UDP : force udp checksum to 0
v_response(10)(15 DOWNTO 0) := TO_UVEC(0, 16);
RETURN v_response;
END;
FUNCTION func_network_total_header_no_align_response_udp(udp_arr : t_network_total_header_64b_arr;
mac_addr : STD_LOGIC_VECTOR(c_network_eth_mac_addr_w-1 DOWNTO 0)) RETURN t_network_total_header_64b_arr IS
VARIABLE v_response : t_network_total_header_64b_arr;
BEGIN
-- ETH, IP
v_response := func_network_total_header_no_align_response_ip(udp_arr, mac_addr);
-- UDP : swap udp dst port and udp src port
v_response(5)(63 DOWNTO 32) := udp_arr(5)(47 DOWNTO 32) & udp_arr(5)(63 DOWNTO 48);
-- UDP : force udp checksum to 0
v_response(5)(15 DOWNTO 0) := TO_UVEC(0, 16);
RETURN v_response;
END;
END common_network_total_header_pkg;
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