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prd-web-01.centraldc.gr

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EDITING: tcp_metrics.rst

.. SPDX-License-Identifier: GPL-2.0
.. NOTE: This document was auto-generated.

============================================
Family ``tcp_metrics`` netlink specification
============================================

.. contents:: :depth: 3

-------
Summary
-------

Management interface for TCP metrics.

----------
Operations
----------

.. _tcp_metrics-operation-get:

get
===
Retrieve metrics.

:attribute-set: :ref:`tcp_metrics-attribute-set-tcp-metrics`
:dont-validate: ['strict', 'dump']
:do:
    **request**
        :attributes: [``addr-ipv4``, ``addr-ipv6``, ``saddr-ipv4``, ``saddr-ipv6``]

**reply**
        :attributes: [``addr-ipv4``, ``addr-ipv6``, ``saddr-ipv4``, ``saddr-ipv6``, ``age``, ``vals``, ``fopen-mss``, ``fopen-syn-drops``, ``fopen-syn-drop-ts``, ``fopen-cookie``]

:dump:
    **reply**
        :attributes: [``addr-ipv4``, ``addr-ipv6``, ``saddr-ipv4``, ``saddr-ipv6``, ``age``, ``vals``, ``fopen-mss``, ``fopen-syn-drops``, ``fopen-syn-drop-ts``, ``fopen-cookie``]

.. _tcp_metrics-operation-del:

del
===
Delete metrics.

:attribute-set: :ref:`tcp_metrics-attribute-set-tcp-metrics`
:dont-validate: ['strict', 'dump']
:flags: [``admin-perm``]
:do:
    **request**
        :attributes: [``addr-ipv4``, ``addr-ipv6``, ``saddr-ipv4``, ``saddr-ipv6``]

-----------
Definitions
-----------

.. _tcp_metrics-definition-tcp-fastopen-cookie-max:

tcp-fastopen-cookie-max
=======================
:type: const
:value: 16

--------------
Attribute sets
--------------

.. _tcp_metrics-attribute-set-tcp-metrics:

tcp-metrics
===========
addr-ipv4 (``u32``)
~~~~~~~~~~~~~~~~~~~
:byte-order: big-endian
:display-hint: ipv4

addr-ipv6 (``binary``)
~~~~~~~~~~~~~~~~~~~~~~
:byte-order: big-endian
:display-hint: ipv6

age (``u64``)
~~~~~~~~~~~~~

tw-tsval (``u32``)
~~~~~~~~~~~~~~~~~~
:doc: unused

tw-ts-stamp (``s32``)
~~~~~~~~~~~~~~~~~~~~~
:doc: unused

vals (``nest``)
~~~~~~~~~~~~~~~
:nested-attributes: :ref:`tcp_metrics-attribute-set-metrics`

fopen-mss (``u16``)
~~~~~~~~~~~~~~~~~~~

fopen-syn-drops (``u16``)
~~~~~~~~~~~~~~~~~~~~~~~~~

fopen-syn-drop-ts (``u64``)
~~~~~~~~~~~~~~~~~~~~~~~~~~~

fopen-cookie (``binary``)
~~~~~~~~~~~~~~~~~~~~~~~~~

saddr-ipv4 (``u32``)
~~~~~~~~~~~~~~~~~~~~
:byte-order: big-endian
:display-hint: ipv4

saddr-ipv6 (``binary``)
~~~~~~~~~~~~~~~~~~~~~~~
:byte-order: big-endian
:display-hint: ipv6

pad (``pad``)
~~~~~~~~~~~~~

.. _tcp_metrics-attribute-set-metrics:

metrics
=======
rtt (``u32``)
~~~~~~~~~~~~~
:doc: Round Trip Time (RTT), in msecs with 3 bits fractional (left-shift by 3 to get the msec value).

rttvar (``u32``)
~~~~~~~~~~~~~~~~
:doc: Round Trip Time VARiance (RTT), in msecs with 2 bits fractional (left-shift by 2 to get the msec value).

ssthresh (``u32``)
~~~~~~~~~~~~~~~~~~
:doc: Slow Start THRESHold.

cwnd (``u32``)
~~~~~~~~~~~~~~
:doc: Congestion Window.

reodering (``u32``)
~~~~~~~~~~~~~~~~~~~
:doc: Reodering metric.

rtt-us (``u32``)
~~~~~~~~~~~~~~~~
:doc: Round Trip Time (RTT), in usecs, with 3 bits fractional (left-shift by 3 to get the msec value).

rttvar-us (``u32``)
~~~~~~~~~~~~~~~~~~~
:doc: Round Trip Time (RTT), in usecs, with 2 bits fractional (left-shift by 3 to get the msec value).

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📄 devlink.rst	RST	51.2 KB	2026-03-31 00:00	EDIT
📄 dpll.rst	RST	16.1 KB	2026-03-31 00:00	EDIT
📄 ethtool.rst	RST	48.8 KB	2026-03-31 00:00	EDIT
📄 fou.rst	RST	2.4 KB	2026-03-31 00:00	EDIT
📄 handshake.rst	RST	2.6 KB	2026-03-31 00:00	EDIT
📄 lockd.rst	RST	1022 B	2026-03-31 00:00	EDIT
📄 mptcp_pm.rst	RST	7.2 KB	2026-03-31 00:00	EDIT
📄 net_shaper.rst	RST	9.8 KB	2026-03-31 00:00	EDIT
📄 netdev.rst	RST	16.9 KB	2026-03-31 00:00	EDIT
📄 nfsd.rst	RST	4.2 KB	2026-03-31 00:00	EDIT
📄 nftables.rst	RST	30.7 KB	2026-03-31 00:00	EDIT
📄 nlctrl.rst	RST	3.8 KB	2026-03-31 00:00	EDIT
📄 ovs_datapath.rst	RST	3.1 KB	2026-03-31 00:00	EDIT
📄 ovs_flow.rst	RST	19.2 KB	2026-03-31 00:00	EDIT
📄 ovs_vport.rst	RST	3.3 KB	2026-03-31 00:00	EDIT
📄 rt_addr.rst	RST	2.9 KB	2026-03-31 00:00	EDIT
📄 rt_link.rst	RST	39 KB	2026-03-31 00:00	EDIT
📄 rt_route.rst	RST	7 KB	2026-03-31 00:00	EDIT
📄 tc.rst	RST	65.2 KB	2026-03-31 00:00	EDIT
📄 tcp_metrics.rst	RST	3.1 KB	2026-03-31 00:00	EDIT
📄 team.rst	RST	3.3 KB	2026-03-31 00:00	EDIT

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