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Implement fast IP packet forwarding

Posted: 03 Oct 2008     Print Version  Bookmark and Share

Keywords:Xtensa processor  IP packet  IP routers  packet forwarding 

Over the last decade, the Internet has grown substantially in terms of increasing traffic amount and number of routers/hosts added to the network. A major function of IP routers is packet forwarding, which involves doing a routing table lookup based on the IP destination address field in the IP packet header and then identifying the next hop to which the incoming packet should be sent.

This application note describes how to configure an Xtensa processor to achieve fast IP packet forwarding. By developing three new customised instructions using TIE, the IP table lookup and update functions can be significantly accelerated. One route lookup can be achieved with less than 10 instructions, compared to more than 100 instructions with a standard RISC processor.

View the PDF document for more information.

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