505cc2bb0e
A new role :zephyr_file: is available that renders to a link to the file or folder in GitHub. Find appropriate references using :file: and convert to :zephyr_file: to take advantage of its linking capability. Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
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29 lines
1.3 KiB
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.. _traffic-class-support:
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Traffic Classification
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#######################
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Overview
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********
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`Traffic classification <https://en.wikipedia.org/wiki/Traffic_classification>`_
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is an automated process that categorizes computer network traffic according to
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various parameters. For Zephyr, the VLAN priority code point (PCP) is used
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to classify both received and sent network packets. See more information about
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VLAN priority at `IEEE 802.1Q <https://en.wikipedia.org/wiki/IEEE_802.1Q>`_.
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By default, all network traffic is treated equal in Zephyr. If desired, the
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option :option:`CONFIG_NET_TC_TX_COUNT` can be used to set the number of
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transmit queues. The option :option:`CONFIG_NET_TC_RX_COUNT` can be used to set
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the number of receive queues. Each traffic class queue corresponds to a
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specific kernel work queue. Each kernel work queue has a priority.
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The VLAN priority is mapped to a certain traffic class according to rules
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specified in `IEEE 802.1Q spec`_ chapter I.3, chapter 8.6.6 table 8-4,
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and chapter 34.5 table 34-1. Each traffic class is in turn mapped to a certain
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kernel work queue. The maximum number of traffic classes for both Rx and Tx
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is 8.
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See :zephyr_file:`subsys/net/ip/net_tc.c` for details of how various mappings are done.
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.. _IEEE 802.1Q spec: https://ieeexplore.ieee.org/document/6991462/
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