P4 (programming language): Difference between revisions

Revision as of 18:05, 5 November 2015

Revision as of 15:51, 23 December 2015

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===Headers===

Header definitions describe packet formats and provide names for the fields within the packet. The language allows customized header names and fields of arbitrary length, although many header definitions use widely-known protocol names and fields widths. For example, an 802.3 ethernet header definition might be called “ethernet” and consist of the a 48-bit field named “src”“dest” followed by a 48-bit “dest”“src” field, followed by a 16-bit “type” field. The names in a header definition are used later in the P4 program to reference these fields.

===Parsers===