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Traffic Classification

Overview

Traffic classification is an automated process that categorizes computer network traffic according to various parameters. For Zephyr, the VLAN priority code point (PCP) is used to classify both received and sent network packets. See more information about VLAN priority at IEEE 802.1Q.

By default, all network traffic is treated equal in Zephyr. If desired, the option CONFIG_NET_TC_TX_COUNT can be used to set the number of transmit queues. The option CONFIG_NET_TC_RX_COUNT can be used to set the number of receive queues. Each traffic class queue corresponds to a specific kernel work queue. Each kernel work queue has a priority. The VLAN priority is mapped to a certain traffic class according to rules specified in IEEE 802.1Q spec chapter I.3, chapter 8.6.6 table 8-4, and chapter 34.5 table 34-1. Each traffic class is in turn mapped to a certain kernel work queue. The maximum number of traffic classes for both Rx and Tx is 8.

See subsys/net/ip/net_tc.c for details of how various mappings are done.