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28 lines
1.3 KiB
28 lines
1.3 KiB
.. _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 :kconfig:option:`CONFIG_NET_TC_TX_COUNT` can be used to set the number of |
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transmit queues. The option :kconfig: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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