29 lines
1.3 KiB
ReStructuredText
29 lines
1.3 KiB
ReStructuredText
.. _traffic-class-support:
|
|
|
|
Traffic Classification
|
|
#######################
|
|
|
|
Overview
|
|
********
|
|
|
|
`Traffic classification <https://en.wikipedia.org/wiki/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 <https://en.wikipedia.org/wiki/IEEE_802.1Q>`_.
|
|
|
|
By default, all network traffic is treated equal in Zephyr. If desired, the
|
|
option :kconfig:option:`CONFIG_NET_TC_TX_COUNT` can be used to set the number of
|
|
transmit queues. The option :kconfig: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 :zephyr_file:`subsys/net/ip/net_tc.c` for details of how various mappings are done.
|
|
|
|
.. _IEEE 802.1Q spec: https://ieeexplore.ieee.org/document/6991462/
|