Custom Wireshark dissector for Ethernet

Hello All,

I want to identify my custom frame based on "Type" field in the Ethernet and I want to dissect it. I was able to dissect the packets based on TCP/UDP port,but don't know how to do it at Ethernet level. Also after dissecting the custom Ethernet frame I should be able to give control back to Wireshark to dissect the content of Ethernet frame ie.IP-TCP and so on.