Dynamically-optimized hash-based packet classifier
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United States of America Patent
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Dec 27, 2022
Grant Date -
Nov 4, 2021
app pub date -
May 4, 2020
filing date -
May 4, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
A network element includes multiple ports and a packet classifier. The packet classifier is configured to receive rules and Rule Patterns (RPs), each RP corresponding to a subset of the rules and specifies positions of unmasked packet-header bits to be matched by the rules in the subset, to store in a RAM a grouping of the RPs into Extended RPs (ERPs), each ERP defining a superset of the unmasked bits in the RPs associated therewith, to receive packets and match each packet to one or more of the rules by accessing the ERPs in the RAM, to determine counter values, each counter value corresponding to a respective RP and is indicative of a number of the received packets that match the RP, and to adaptively modify grouping of the RPs into the ERPs depending on the counter values.
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