Method for accelerating generation of VXLAN packet with hardware, method for accelerating removal of VXLAN header with hardware, and method for accelerating modification to VXLAN packet with hardware

A method for accelerating generation of Virtual Extensible Local Area Network (VXLAN) packets with hardware, the method comprising:

• determining whether an original packet is an upstream packet;
• when the original packet is the upstream packet, determining whether the original packet is for a VXLAN egress interface;
• when the original packet is for the VXLAN egress interface, adding a prototype outer header to a front of the original packet and thereby generating a VXLAN packet;
• and
• after generating the VXLAN packet, determining whether to modify content of the prototype outer header of the VXLAN packet,
• wherein the prototype outer header includes K field(s) and includes M fields, and the M is an integer greater than one, in which the K is a positive integer greater than one and smaller than the M;
• the K fields include a Point-to-Point Protocol over Ethernet (PPPoE) field, an Internet Protocol version 4 (IPv4) field or an Internet Protocol version 6 (IPv6) field, and a User Datagram Protocol (UDP) field;
• the method includes a decision step to determine whether to modify content of the K field(s);
• and
• the decision step includes:
• determining whether a PPPoE length offset of the PPPoE field is zero, and updating content of the PPPoE field when the PPPoE length offset is not zero;
• determining whether an IPv4/IPv6offset of the IPv4/IPv6 field is zero, and updating content of the IPv4/IPv6 field when the IPv4/IPv6 offset is not zero;
• determining whether a UDP length offset of the UDP field is zero, and updating content of the UDP field when the UDP length offset is not zero;
• and
• determining whether a UDP sport (UDP source port) offset of the UDP field is zero, and updating content of the UDP field when the UDP sport offset is not zero.