=============================
Netlink interface for ethtool
=============================
Basic information
=================
Netlink interface for ethtool uses generic netlink family ``ethtool``
(userspace application should use macros ``ETHTOOL_GENL_NAME`` and
``ETHTOOL_GENL_VERSION`` defined in ``<linux/ethtool_netlink.h>`` uapi
header). This family does not use a specific header, all information in
requests and replies is passed using netlink attributes.
The ethtool netlink interface uses extended ACK for error and warning
reporting, userspace application developers are encouraged to make these
messages available to user in a suitable way.
Requests can be divided into three categories: "get" (retrieving information),
"set" (setting parameters) and "action" (invoking an action).
All "set" and "action" type requests require admin privileges
(``CAP_NET_ADMIN`` in the namespace). Most "get" type requests are allowed for
anyone but there are exceptions (where the response contains sensitive
information). In some cases, the request as such is allowed for anyone but
unprivileged users have attributes with sensitive information (e.g.
wake-on-lan password) omitted.
Conventions
===========
Attributes which represent a boolean value usually use NLA_U8 type so that we
can distinguish three states: "on", "off" and "not present" (meaning the
information is not available in "get" requests or value is not to be changed
in "set" requests). For these attributes, the "true" value should be passed as
number 1 but any non-zero value should be understood as "true" by recipient.
In the tables below, "bool" denotes NLA_U8 attributes interpreted in this way.
In the message structure descriptions below, if an attribute name is suffixed
with "+", parent nest can contain multiple attributes of the same type. This
implements an array of entries.
Attributes that need to be filled-in by device drivers and that are dumped to
user space based on whether they are valid or not should not use zero as a
valid value. This avoids the need to explicitly signal the validity of the
attribute in the device driver API.
Request header
==============
Each request or reply message contains a nested attribute with common header.
Structure of this header is
============================== ====== =============================
``ETHTOOL_A_HEADER_DEV_INDEX`` u32 device ifindex
``ETHTOOL_A_HEADER_DEV_NAME`` string device name
``ETHTOOL_A_HEADER_FLAGS`` u32 flags common for all requests
``ETHTOOL_A_HEADER_PHY_INDEX`` u32 phy device index
============================== ====== =============================
``ETHTOOL_A_HEADER_DEV_INDEX`` and ``ETHTOOL_A_HEADER_DEV_NAME`` identify the
device message relates to. One of them is sufficient in requests, if both are
used, they must identify the same device. Some requests, e.g. global string
sets, do not require device identification. Most ``GET`` requests also allow
dump requests without device identification to query the same information for
all devices providing it (each device in a separate message).
``ETHTOOL_A_HEADER_FLAGS`` is a bitmap of request flags common for all request
types. The interpretation of these flags is the same for all request types but
the flags may not apply to requests. Recognized flags are:
================================= ===================================
``ETHTOOL_FLAG_COMPACT_BITSETS`` use compact format bitsets in reply
``ETHTOOL_FLAG_OMIT_REPLY`` omit optional reply (_SET and _ACT)
``ETHTOOL_FLAG_STATS`` include optional device statistics
================================= ===================================
New request flags should follow the general idea that if the flag is not set,
the behaviour is backward compatible, i.e. requests from old clients not aware
of the flag should be interpreted the way the client expects. A client must
not set flags it does not understand.
``ETHTOOL_A_HEADER_PHY_INDEX`` identifies the Ethernet PHY the message relates to.
As there are numerous commands that are related to PHY configuration, and because
there may be more than one PHY on the link, the PHY index can be passed in the
request for the commands that needs it. It is, however, not mandatory, and if it
is not passed for commands that target a PHY, the net_device.phydev pointer
is used.
Bit sets
========
For short bitmaps of (reasonably) fixed length, standard ``NLA_BITFIELD32``
type is used. For arbitrary length bitmaps, ethtool netlink uses a nested
attribute with contents of one of two forms: compact (two binary bitmaps
representing bit values and mask of affected bits) and bit-by-bit (list of
bits identified by either index or name).
Verbose (bit-by-bit) bitsets allow sending symbolic names for bits together
with their values which saves a round trip (when the bitset is passed in a
request) or at least a second request (when the bitset is in a reply). This is
useful for one shot applications like traditional ethtool command. On the
other hand, long running applications like ethtool monitor (displaying
notifications) or network management daemons may prefer fetching the names
only once and using compact form to save message size. Notifications from
ethtool netlink interface always use compact form for bitsets.
A bitset can represent either a value/mask pair (``ETHTOOL_A_BITSET_NOMASK``
not set) or a single bitmap (``ETHTOOL_A_BITSET_NOMASK`` set). In requests
modifying a bitmap, the former changes the bit set in mask to values set in
value and preserves the rest; the latter sets the bits set in the bitmap and
clears the rest.
Compact form: nested (bitset) attribute contents:
============================ ====== ============================
``ETHTOOL_A_BITSET_NOMASK`` flag no mask, only a list
``ETHTOOL_A_BITSET_SIZE`` u32 number of significant bits
``ETHTOOL_A_BITSET_VALUE`` binary bitmap of bit values
``ETHTOOL_A_BITSET_MASK`` binary bitmap of valid bits
============================ ====== ============================
Value and mask must have length at least ``ETHTOOL_A_BITSET_SIZE`` bits
rounded up to a multiple of 32 bits. They consist of 32-bit words in host byte
order, words ordered from least significant to most significant (i.e. the same
way as bitmaps are passed with ioctl interface).
For compact form, ``ETHTOOL_A_BITSET_SIZE`` and ``ETHTOOL_A_BITSET_VALUE`` are
mandatory. ``ETHTOOL_A_BITSET_MASK`` attribute is mandatory if
``ETHTOOL_A_BITSET_NOMASK`` is not set (bitset represents a value/mask pair);
if ``ETHTOOL_A_BITSET_NOMASK`` is not set, ``ETHTOOL_A_BITSET_MASK`` is not
allowed (bitset represents a single bitmap.
Kernel bit set length may differ from userspace length if older application is
used on newer kernel or vice versa. If userspace bitmap is longer, an error is
issued only if the request actually tries to set values of some bits not
recognized by kernel.
Bit-by-bit form: nested (bitset) attribute contents:
+------------------------------------+--------+-----------------------------+
| ``ETHTOOL_A_BITSET_NOMASK`` | flag | no mask, only a list |
+------------------------------------+--------+-----------------------------+
| ``ETHTOOL_A_BITSET_SIZE`` | u32 | number of significant bits |
+------------------------------------+--------+-----------------------------+
| ``ETHTOOL_A_BITSET_BITS`` | nested | array of bits |
+-+----------------------------------+--------+-----------------------------+
| | ``ETHTOOL_A_BITSET_BITS_BIT+`` | nested | one bit |
+-+-+--------------------------------+--------+-----------------------------+
| | | ``ETHTOOL_A_BITSET_BIT_INDEX`` | u32 | bit index (0 for LSB) |
+-+-+--------------------------------+--------+-----------------------------+
| | | ``ETHTOOL_A_BITSET_BIT_NAME`` | string | bit name |
+-+-+--------------------------------+--------+-----------------------------+
| | | ``ETHTOOL_A_BITSET_BIT_VALUE`` | flag | present if bit is set |
+-+-+--------------------------------+--------+-----------------------------+
Bit size is optional for bit-by-bit form. ``ETHTOOL_A_BITSET_BITS`` nest can
only contain ``ETHTOOL_A_BITSET_BITS_BIT`` attributes but there can be an
arbitrary number of them. A bit may be identified by its index or by its
name. When used in requests, listed bits are set to 0 or 1 according to
``ETHTOOL_A_BITSET_BIT_VALUE``, the rest is preserved. A request fails if
index exceeds kernel bit length or if name is not recognized.
When ``ETHTOOL_A_BITSET_NOMASK`` flag is present, bitset is interpreted as
a simple bitmap. ``ETHTOOL_A_BITSET_BIT_VALUE`` attributes are not used in
such case. Such bitset represents a bitmap with listed bits set and the rest
zero.
In requests, application can use either form. Form used by kernel in reply is
determined by ``ETHTOOL_FLAG_COMPACT_BITSETS`` flag in flags field of request
header. Semantics of value and mask depends on the attribute.
List of message types
=====================
All constants identifying message types use ``ETHTOOL_CMD_`` prefix and suffix
according to message purpose:
============== ======================================
``_GET`` userspace request to retrieve data
``_SET`` userspace request to set data
``_ACT`` userspace request to perform an action
``_GET_REPLY`` kernel reply to a ``GET`` request
``_SET_REPLY`` kernel reply to a ``SET`` request
``_ACT_REPLY`` kernel reply to an ``ACT`` request
``_NTF`` kernel notification
============== ======================================
Userspace to kernel:
===================================== =================================
``ETHTOOL_MSG_STRSET_GET`` get string set
``ETHTOOL_MSG_LINKINFO_GET`` get link settings
``ETHTOOL_MSG_LINKINFO_SET`` set link settings
``ETHTOOL_MSG_LINKMODES_GET`` get link modes info
``ETHTOOL_MSG_LINKMODES_SET`` set link modes info
``ETHTOOL_MSG_LINKSTATE_GET`` get link state
``ETHTOOL_MSG_DEBUG_GET`` get debugging settings
``ETHTOOL_MSG_DEBUG_SET`` set debugging settings
``ETHTOOL_MSG_WOL_GET`` get wake-on-lan settings
``ETHTOOL_MSG_WOL_SET`` set wake-on-lan settings
``ETHTOOL_MSG_FEATURES_GET`` get device features
``ETHTOOL_MSG_FEATURES_SET`` set device features
``ETHTOOL_MSG_PRIVFLAGS_GET`` get private flags
``ETHTOOL_MSG_PRIVFLAGS_SET`` set private flags
``ETHTOOL_MSG_RINGS_GET`` get ring sizes
``ETHTOOL_MSG_RINGS_SET`` set ring sizes
``ETHTOOL_MSG_CHANNELS_GET`` get channel counts
``ETHTOOL_MSG_CHANNELS_SET`` set channel counts
``ETHTOOL_MSG_COALESCE_GET`` get coalescing parameters
``ETHTOOL_MSG_COALESCE_SET`` set coalescing parameters
``ETHTOOL_MSG_PAUSE_GET`` get pause parameters
``ETHTOOL_MSG_PAUSE_SET`` set pause parameters
``ETHTOOL_MSG_EEE_GET`` get EEE settings
``ETHTOOL_MSG_EEE_SET`` set EEE settings
``ETHTOOL_MSG_TSINFO_GET`` get timestamping info
``ETHTOOL_MSG_CABLE_TEST_ACT`` action start cable test
``ETHTOOL_MSG_CABLE_TEST_TDR_ACT`` action start raw TDR cable test
``ETHTOOL_MSG_TUNNEL_INFO_GET`` get tunnel offload info
``ETHTOOL_MSG_FEC_GET`` get FEC settings
``ETHTOOL_MSG_FEC_SET`` set FEC settings
``ETHTOOL_MSG_MODULE_EEPROM_GET`` read SFP module EEPROM
``ETHTOOL_MSG_STATS_GET`` get standard statistics
``ETHTOOL_MSG_PHC_VCLOCKS_GET`` get PHC virtual clocks info
``ETHTOOL_MSG_MODULE_SET`` set transceiver module parameters
``ETHTOOL_MSG_MODULE_GET`` get transceiver module parameters
``ETHTOOL_MSG_PSE_SET`` set PSE parameters
``ETHTOOL_MSG_PSE_GET`` get PSE parameters
``ETHTOOL_MSG_RSS_GET`` get RSS settings
``ETHTOOL_MSG_PLCA_GET_CFG`` get PLCA RS parameters
``ETHTOOL_MSG_PLCA_SET_CFG`` set PLCA RS parameters
``ETHTOOL_MSG_PLCA_GET_STATUS`` get PLCA RS status
``ETHTOOL_MSG_MM_GET`` get MAC merge layer state
``ETHTOOL_MSG_MM_SET`` set MAC merge layer parameters
``ETHTOOL_MSG_MODULE_FW_FLASH_ACT`` flash transceiver module firmware
``ETHTOOL_MSG_PHY_GET`` get Ethernet PHY information
``ETHTOOL_MSG_TSCONFIG_GET`` get hw timestamping configuration
``ETHTOOL_MSG_TSCONFIG_SET`` set hw timestamping configuration
``ETHTOOL_MSG_RSS_SET`` set RSS settings
``ETHTOOL_MSG_RSS_CREATE_ACT`` create an additional RSS context
``ETHTOOL_MSG_RSS_DELETE_ACT`` delete an additional RSS context
===================================== =================================
Kernel to userspace:
======================================== =================================
``ETHTOOL_MSG_STRSET_GET_REPLY`` string set contents
``ETHTOOL_MSG_LINKINFO_GET_REPLY`` link settings
``ETHTOOL_MSG_LINKINFO_NTF`` link settings notification
``ETHTOOL_MSG_LINKMODES_GET_REPLY`` link modes info
``ETHTOOL_MSG_LINKMODES_NTF`` link modes notification
``ETHTOOL_MSG_LINKSTATE_GET_REPLY`` link state info
``ETHTOOL_MSG_DEBUG_GET_REPLY`` debugging settings
``ETHTOOL_MSG_DEBUG_NTF`` debugging settings notification
``ETHTOOL_MSG_WOL_GET_REPLY`` wake-on-lan settings
``ETHTOOL_MSG_WOL_NTF`` wake-on-lan settings notification
``ETHTOOL_MSG_FEATURES_GET_REPLY`` device features
``ETHTOOL_MSG_FEATURES_SET_REPLY`` optional reply to FEATURES_SET
``ETHTOOL_MSG_FEATURES_NTF`` netdev features notification
``ETHTOOL_MSG_PRIVFLAGS_GET_REPLY`` private flags
``ETHTOOL_MSG_PRIVFLAGS_NTF`` private flags
``ETHTOOL_MSG_RINGS_GET_REPLY`` ring sizes
``ETHTOOL_MSG_RINGS_NTF`` ring sizes
``ETHTOOL_MSG_CHANNELS_GET_REPLY`` channel counts
``ETHTOOL_MSG_CHANNELS_NTF`` channel counts
``ETHTOOL_MSG_COALESCE_GET_REPLY`` coalescing parameters
``ETHTOOL_MSG_COALESCE_NTF`` coalescing parameters
``ETHTOOL_MSG_PAUSE_GET_REPLY`` pause parameters
``ETHTOOL_MSG_PAUSE_NTF`` pause parameters
``ETHTOOL_MSG_EEE_GET_REPLY`` EEE settings
``ETHTOOL_MSG_EEE_NTF`` EEE settings
``ETHTOOL_MSG_TSINFO_GET_REPLY`` timestamping info
``ETHTOOL_MSG_CABLE_TEST_NTF`` Cable test results
``ETHTOOL_MSG_CABLE_TEST_TDR_NTF`` Cable test TDR results
``ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY`` tunnel offload info
``ETHTOOL_MSG_FEC_GET_REPLY`` FEC settings
``ETHTOOL_MSG_FEC_NTF`` FEC settings
``ETHTOOL_MSG_MODULE_EEPROM_GET_REPLY`` read SFP module EEPROM
``ETHTOOL_MSG_STATS_GET_REPLY`` standard statistics
``ETHTOOL_MSG_PHC_VCLOCKS_GET_REPLY`` PHC virtual clocks info
``ETHTOOL_MSG_MODULE_GET_REPLY`` transceiver module parameters
``ETHTOOL_MSG_PSE_GET_REPLY`` PSE parameters
``ETHTOOL_MSG_RSS_GET_REPLY`` RSS settings
``ETHTOOL_MSG_RSS_NTF`` RSS settings
``ETHTOOL_MSG_PLCA_GET_CFG_REPLY`` PLCA RS parameters
``ETHTOOL_MSG_PLCA_GET_STATUS_REPLY`` PLCA RS status
``ETHTOOL_MSG_PLCA_NTF`` PLCA RS parameters
``ETHTOOL_MSG_MM_GET_REPLY`` MAC merge layer status
``ETHTOOL_MSG_MODULE_FW_FLASH_NTF`` transceiver module flash updates
``ETHTOOL_MSG_PHY_GET_REPLY`` Ethernet PHY information
``ETHTOOL_MSG_PHY_NTF`` Ethernet PHY information change
``ETHTOOL_MSG_TSCONFIG_GET_REPLY`` hw timestamping configuration
``ETHTOOL_MSG_TSCONFIG_SET_REPLY`` new hw timestamping configuration
``ETHTOOL_MSG_PSE_NTF`` PSE events notification
``ETHTOOL_MSG_RSS_NTF`` RSS settings notification
``ETHTOOL_MSG_RSS_CREATE_ACT_REPLY`` create an additional RSS context
``ETHTOOL_MSG_RSS_CREATE_NTF`` additional RSS context created
``ETHTOOL_MSG_RSS_DELETE_NTF`` additional RSS context deleted
======================================== =================================
``GET`` requests are sent by userspace applications to retrieve device
information. They usually do not contain any message specific attributes.
Kernel replies with corresponding "GET_REPLY" message. For most types, ``GET``
request with ``NLM_F_DUMP`` and no device identification can be used to query
the information for all devices supporting the request.
If the data can be also modified, corresponding ``SET`` message with the same
layout as corresponding ``GET_REPLY`` is used to request changes. Only
attributes where a change is requested are included in such request (also, not
all attributes may be changed). Replies to most ``SET`` request consist only
of error code and extack; if kernel provides additional data, it is sent in
the form of corresponding ``SET_REPLY`` message which can be suppressed by
setting ``ETHTOOL_FLAG_OMIT_REPLY`` flag in request header.
Data modification also triggers sending a ``NTF`` message with a notification.
These usually bear only a subset of attributes which was affected by the
change. The same notification is issued if the data is modified using other
means (mostly ioctl ethtool interface). Unlike notifications from ethtool
netlink code which are only sent if something actually changed, notifications
triggered by ioctl interface may be sent even if the request did not actually
change any data.
``ACT`` messages request kernel (driver) to perform a specific action. If some
information is reported by kernel (which can be suppressed by setting
``ETHTOOL_FLAG_OMIT_REPLY`` flag in request header), the reply takes form of
an ``ACT_REPLY`` message. Performing an action also triggers a notification
(``NTF`` message).
Later sections describe the format and semantics of these messages.
STRSET_GET
==========
Requests contents of a string set as provided by ioctl commands
``ETHTOOL_GSSET_INFO`` and ``ETHTOOL_GSTRINGS.`` String sets are not user
writeable so that the corresponding ``STRSET_SET`` message is only used in
kernel replies. There are two types of string sets: global (independent of
a device, e.g. device feature names) and device specific (e.g. device private
flags).
Request contents:
+---------------------------------------+--------+------------------------+
| ``ETHTOOL_A_STRSET_HEADER`` | nested | request header |
+---------------------------------------+--------+------------------------+
| ``ETHTOOL_A_STRSET_STRINGSETS`` | nested | string set to request |
+-+-------------------------------------+--------+------------------------+
| | ``ETHTOOL_A_STRINGSETS_STRINGSET+`` | nested | one string set |
+-+-+-----------------------------------+--------+------------------------+
| | | ``ETHTOOL_A_STRINGSET_ID`` | u32 | set id |
+-+-+-----------------------------------+--------+------------------------+
Kernel response contents:
+---------------------------------------+--------+-----------------------+
| ``ETHTOOL_A_STRSET_HEADER`` | nested | reply header |
+---------------------------------------+--------+-----------------------+
| ``ETHTOOL_A_STRSET_STRINGSETS`` | nested | array of string sets |
+-+-------------------------------------+--------+-----------------------+
| | ``ETHTOOL_A_STRINGSETS_STRINGSET+`` | nested | one string set |
+-+-+-----------------------------------+--------+-----------------------+
| | | ``ETHTOOL_A_STRINGSET_ID`` | u32 | set id |
+-+-+-----------------------------------+--------+-----------------------+
| | | ``ETHTOOL_A_STRINGSET_COUNT`` | u32 | number of strings |
+-+-+-----------------------------------+--------+-----------------------+
| | | ``ETHTOOL_A_STRINGSET_STRINGS`` | nested | array of strings |
+-+-+-+---------------------------------+--------+-----------------------+
| | | | ``ETHTOOL_A_STRINGS_STRING+`` | nested | one string |
+-+-+-+-+-------------------------------+--------+-----------------------+
| | | | | ``ETHTOOL_A_STRING_INDEX`` | u32 | string index |
+-+-+-+-+-------------------------------+--------+-----------------------+
| | | | | ``ETHTOOL_A_STRING_VALUE`` | string | string value |
+-+-+-+-+-------------------------------+--------+-----------------------+
| ``ETHTOOL_A_STRSET_COUNTS_ONLY`` | flag | return only counts |
+---------------------------------------+--------+-----------------------+
Device identification in request header is optional. Depending on its presence
a and ``NLM_F_DUMP`` flag, there are three type of ``STRSET_GET`` requests:
- no ``NLM_F_DUMP,`` no device: get "global" stringsets
- no ``NLM_F_DUMP``, with device: get string sets related to the device
- ``NLM_F_DUMP``, no device: get device related string sets for all devices
If there is no ``ETHTOOL_A_STRSET_STRINGSETS`` array, all string sets of
requested type are returned, otherwise only those specified in the request.
Flag ``ETHTOOL_A_STRSET_COUNTS_ONLY`` tells kernel to only return string
counts of the sets, not the actual strings.
LINKINFO_GET
============
Requests link settings as provided by ``ETHTOOL_GLINKSETTINGS`` except for
link modes and autonegotiation related information. The request does not use
any attributes.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKINFO_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKINFO_HEADER`` nested reply header
``ETHTOOL_A_LINKINFO_PORT`` u8 physical port
``ETHTOOL_A_LINKINFO_PHYADDR`` u8 phy MDIO address
``ETHTOOL_A_LINKINFO_TP_MDIX`` u8 MDI(-X) status
``ETHTOOL_A_LINKINFO_TP_MDIX_CTRL`` u8 MDI(-X) control
``ETHTOOL_A_LINKINFO_TRANSCEIVER`` u8 transceiver
==================================== ====== ==========================
Attributes and their values have the same meaning as matching members of the
corresponding ioctl structures.
``LINKINFO_GET`` allows dump requests (kernel returns reply message for all
devices supporting the request).
LINKINFO_SET
============
``LINKINFO_SET`` request allows setting some of the attributes reported by
``LINKINFO_GET``.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKINFO_HEADER`` nested request header
``ETHTOOL_A_LINKINFO_PORT`` u8 physical port
``ETHTOOL_A_LINKINFO_PHYADDR`` u8 phy MDIO address
``ETHTOOL_A_LINKINFO_TP_MDIX_CTRL`` u8 MDI(-X) control
==================================== ====== ==========================
MDI(-X) status and transceiver cannot be set, request with the corresponding
attributes is rejected.
LINKMODES_GET
=============
Requests link modes (supported, advertised and peer advertised) and related
information (autonegotiation status, link speed and duplex) as provided by
``ETHTOOL_GLINKSETTINGS``. The request does not use any attributes.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
========================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested reply header
``ETHTOOL_A_LINKMODES_AUTONEG`` u8 autonegotiation status
``ETHTOOL_A_LINKMODES_OURS`` bitset advertised link modes
``ETHTOOL_A_LINKMODES_PEER`` bitset partner link modes
``ETHTOOL_A_LINKMODES_SPEED`` u32 link speed (Mb/s)
``ETHTOOL_A_LINKMODES_DUPLEX`` u8 duplex mode
``ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG`` u8 Master/slave port mode
``ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE`` u8 Master/slave port state
``ETHTOOL_A_LINKMODES_RATE_MATCHING`` u8 PHY rate matching
========================================== ====== ==========================
For ``ETHTOOL_A_LINKMODES_OURS``, value represents advertised modes and mask
represents supported modes. ``ETHTOOL_A_LINKMODES_PEER`` in the reply is a bit
list.
``LINKMODES_GET`` allows dump requests (kernel returns reply messages for all
devices supporting the request).
LINKMODES_SET
=============
Request contents:
========================================== ====== ==========================
``ETHTOOL_A_LINKMODES_HEADER`` nested request header
``ETHTOOL_A_LINKMODES_AUTONEG`` u8 autonegotiation status
``ETHTOOL_A_LINKMODES_OURS`` bitset advertised link modes
``ETHTOOL_A_LINKMODES_PEER`` bitset partner link modes
``ETHTOOL_A_LINKMODES_SPEED`` u32 link speed (Mb/s)
``ETHTOOL_A_LINKMODES_DUPLEX`` u8 duplex mode
``ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG`` u8 Master/slave port mode
``ETHTOOL_A_LINKMODES_RATE_MATCHING`` u8 PHY rate matching
``ETHTOOL_A_LINKMODES_LANES`` u32 lanes
========================================== ====== ==========================
``ETHTOOL_A_LINKMODES_OURS`` bit set allows setting advertised link modes. If
autonegotiation is on (either set now or kept from before), advertised modes
are not changed (no ``ETHTOOL_A_LINKMODES_OURS`` attribute) and at least one
of speed, duplex and lanes is specified, kernel adjusts advertised modes to all
supported modes matching speed, duplex, lanes or all (whatever is specified).
This autoselection is done on ethtool side with ioctl interface, netlink
interface is supposed to allow requesting changes without knowing what exactly
kernel supports.
LINKSTATE_GET
=============
Requests link state information. Link up/down flag (as provided by
``ETHTOOL_GLINK`` ioctl command) is provided. Optionally, extended state might
be provided as well. In general, extended state describes reasons for why a port
is down, or why it operates in some non-obvious mode. This request does not have
any attributes.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_LINKSTATE_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ============================
``ETHTOOL_A_LINKSTATE_HEADER`` nested reply header
``ETHTOOL_A_LINKSTATE_LINK`` bool link state (up/down)
``ETHTOOL_A_LINKSTATE_SQI`` u32 Current Signal Quality Index
``ETHTOOL_A_LINKSTATE_SQI_MAX`` u32 Max support SQI value
``ETHTOOL_A_LINKSTATE_EXT_STATE`` u8 link extended state
``ETHTOOL_A_LINKSTATE_EXT_SUBSTATE`` u8 link extended substate
``ETHTOOL_A_LINKSTATE_EXT_DOWN_CNT`` u32 count of link down events
==================================== ====== ============================
For most NIC drivers, the value of ``ETHTOOL_A_LINKSTATE_LINK`` returns
carrier flag provided by ``netif_carrier_ok()`` but there are drivers which
define their own handler.
``ETHTOOL_A_LINKSTATE_EXT_STATE`` and ``ETHTOOL_A_LINKSTATE_EXT_SUBSTATE`` are
optional values. ethtool core can provide either both
``ETHTOOL_A_LINKSTATE_EXT_STATE`` and ``ETHTOOL_A_LINKSTATE_EXT_SUBSTATE``,
or only ``ETHTOOL_A_LINKSTATE_EXT_STATE``, or none of them.
``LINKSTATE_GET`` allows dump requests (kernel returns reply messages for all
devices supporting the request).
Link extended states:
================================================ ================================
============
``ETHTOOL_LINK_EXT_STATE_AUTONEG`` States relating to the autonegotiation or
issues therein
``ETHTOOL_LINK_EXT_STATE_LINK_TRAINING_FAILURE`` Failure during link training
``ETHTOOL_LINK_EXT_STATE_LINK_LOGICAL_MISMATCH`` Logical mismatch in physical coding sublayer
or forward error correction sublayer
``ETHTOOL_LINK_EXT_STATE_BAD_SIGNAL_INTEGRITY`` Signal integrity issues
``ETHTOOL_LINK_EXT_STATE_NO_CABLE`` No cable connected
``ETHTOOL_LINK_EXT_STATE_CABLE_ISSUE`` Failure is related to cable,
e.g., unsupported cable
``ETHTOOL_LINK_EXT_STATE_EEPROM_ISSUE`` Failure is related to EEPROM, e.g., failure
during reading or parsing the data
``ETHTOOL_LINK_EXT_STATE_CALIBRATION_FAILURE`` Failure during calibration algorithm
``ETHTOOL_LINK_EXT_STATE_POWER_BUDGET_EXCEEDED`` The hardware is not able to provide the
power required from cable or module
``ETHTOOL_LINK_EXT_STATE_OVERHEAT`` The module is overheated
``ETHTOOL_LINK_EXT_STATE_MODULE`` Transceiver module issue
================================================ ============================================
Link extended substates:
Autoneg substates:
=============================================================== ================================
``ETHTOOL_LINK_EXT_SUBSTATE_AN_NO_PARTNER_DETECTED`` Peer side is down
``ETHTOOL_LINK_EXT_SUBSTATE_AN_ACK_NOT_RECEIVED`` Ack not received from peer side
``ETHTOOL_LINK_EXT_SUBSTATE_AN_NEXT_PAGE_EXCHANGE_FAILED`` Next page exchange failed
``ETHTOOL_LINK_EXT_SUBSTATE_AN_NO_PARTNER_DETECTED_FORCE_MODE`` Peer side is down during force
mode or there is no agreement of
speed
``ETHTOOL_LINK_EXT_SUBSTATE_AN_FEC_MISMATCH_DURING_OVERRIDE`` Forward error correction modes
in both sides are mismatched
``ETHTOOL_LINK_EXT_SUBSTATE_AN_NO_HCD`` No Highest Common Denominator
=============================================================== ================================
Link training substates:
=========================================================================== ====================
``ETHTOOL_LINK_EXT_SUBSTATE_LT_KR_FRAME_LOCK_NOT_ACQUIRED`` Frames were not
recognized, the
lock failed
``ETHTOOL_LINK_EXT_SUBSTATE_LT_KR_LINK_INHIBIT_TIMEOUT`` The lock did not
occur before
timeout
``ETHTOOL_LINK_EXT_SUBSTATE_LT_KR_LINK_PARTNER_DID_NOT_SET_RECEIVER_READY`` Peer side did not
send ready signal
after training
process
``ETHTOOL_LINK_EXT_SUBSTATE_LT_REMOTE_FAULT`` Remote side is not
ready yet
=========================================================================== ====================
Link logical mismatch substates:
================================================================ ===============================
``ETHTOOL_LINK_EXT_SUBSTATE_LLM_PCS_DID_NOT_ACQUIRE_BLOCK_LOCK`` Physical coding sublayer was
not locked in first phase -
block lock
``ETHTOOL_LINK_EXT_SUBSTATE_LLM_PCS_DID_NOT_ACQUIRE_AM_LOCK`` Physical coding sublayer was
not locked in second phase -
alignment markers lock
``ETHTOOL_LINK_EXT_SUBSTATE_LLM_PCS_DID_NOT_GET_ALIGN_STATUS`` Physical coding sublayer did
not get align status
``ETHTOOL_LINK_EXT_SUBSTATE_LLM_FC_FEC_IS_NOT_LOCKED`` FC forward error correction is
not locked
``ETHTOOL_LINK_EXT_SUBSTATE_LLM_RS_FEC_IS_NOT_LOCKED`` RS forward error correction is
not locked
================================================================ ===============================
Bad signal integrity substates:
================================================================= =============================
``ETHTOOL_LINK_EXT_SUBSTATE_BSI_LARGE_NUMBER_OF_PHYSICAL_ERRORS`` Large number of physical
errors
``ETHTOOL_LINK_EXT_SUBSTATE_BSI_UNSUPPORTED_RATE`` The system attempted to
operate the cable at a rate
that is not formally
supported, which led to
signal integrity issues
``ETHTOOL_LINK_EXT_SUBSTATE_BSI_SERDES_REFERENCE_CLOCK_LOST`` The external clock signal for
SerDes is too weak or
unavailable.
``ETHTOOL_LINK_EXT_SUBSTATE_BSI_SERDES_ALOS`` The received signal for
SerDes is too weak because
analog loss of signal.
================================================================= =============================
Cable issue substates:
=================================================== ============================================
``ETHTOOL_LINK_EXT_SUBSTATE_CI_UNSUPPORTED_CABLE`` Unsupported cable
``ETHTOOL_LINK_EXT_SUBSTATE_CI_CABLE_TEST_FAILURE`` Cable test failure
=================================================== ============================================
Transceiver module issue substates:
=================================================== ============================================
``ETHTOOL_LINK_EXT_SUBSTATE_MODULE_CMIS_NOT_READY`` The CMIS Module State Machine did not reach
the ModuleReady state. For example, if the
module is stuck at ModuleFault state
=================================================== ============================================
DEBUG_GET
=========
Requests debugging settings of a device. At the moment, only message mask is
provided.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_DEBUG_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_DEBUG_HEADER`` nested reply header
``ETHTOOL_A_DEBUG_MSGMASK`` bitset message mask
==================================== ====== ==========================
The message mask (``ETHTOOL_A_DEBUG_MSGMASK``) is equal to message level as
provided by ``ETHTOOL_GMSGLVL`` and set by ``ETHTOOL_SMSGLVL`` in ioctl
interface. While it is called message level there for historical reasons, most
drivers and almost all newer drivers use it as a mask of enabled message
classes (represented by ``NETIF_MSG_*`` constants); therefore netlink
interface follows its actual use in practice.
``DEBUG_GET`` allows dump requests (kernel returns reply messages for all
devices supporting the request).
DEBUG_SET
=========
Set or update debugging settings of a device. At the moment, only message mask
is supported.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_DEBUG_HEADER`` nested request header
``ETHTOOL_A_DEBUG_MSGMASK`` bitset message mask
==================================== ====== ==========================
``ETHTOOL_A_DEBUG_MSGMASK`` bit set allows setting or modifying mask of
enabled debugging message types for the device.
WOL_GET
=======
Query device wake-on-lan settings. Unlike most "GET" type requests,
``ETHTOOL_MSG_WOL_GET`` requires (netns) ``CAP_NET_ADMIN`` privileges as it
(potentially) provides SecureOn(tm) password which is confidential.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_WOL_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_WOL_HEADER`` nested reply header
``ETHTOOL_A_WOL_MODES`` bitset mask of enabled WoL modes
``ETHTOOL_A_WOL_SOPASS`` binary SecureOn(tm) password
==================================== ====== ==========================
In reply, ``ETHTOOL_A_WOL_MODES`` mask consists of modes supported by the
device, value of modes which are enabled. ``ETHTOOL_A_WOL_SOPASS`` is only
included in reply if ``WAKE_MAGICSECURE`` mode is supported.
WOL_SET
=======
Set or update wake-on-lan settings.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_WOL_HEADER`` nested request header
``ETHTOOL_A_WOL_MODES`` bitset enabled WoL modes
``ETHTOOL_A_WOL_SOPASS`` binary SecureOn(tm) password
==================================== ====== ==========================
``ETHTOOL_A_WOL_SOPASS`` is only allowed for devices supporting
``WAKE_MAGICSECURE`` mode.
FEATURES_GET
============
Gets netdev features like ``ETHTOOL_GFEATURES`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_FEATURES_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_FEATURES_HEADER`` nested reply header
``ETHTOOL_A_FEATURES_HW`` bitset dev->hw_features
``ETHTOOL_A_FEATURES_WANTED`` bitset dev->wanted_features
``ETHTOOL_A_FEATURES_ACTIVE`` bitset dev->features
``ETHTOOL_A_FEATURES_NOCHANGE`` bitset NETIF_F_NEVER_CHANGE
==================================== ====== ==========================
Bitmaps in kernel response have the same meaning as bitmaps used in ioctl
interference but attribute names are different (they are based on
corresponding members of struct net_device). Legacy "flags" are not provided,
if userspace needs them (most likely only ethtool for backward compatibility),
it can calculate their values from related feature bits itself.
ETHA_FEATURES_HW uses mask consisting of all features recognized by kernel (to
provide all names when using verbose bitmap format), the other three use no
mask (simple bit lists).
FEATURES_SET
============
Request to set netdev features like ``ETHTOOL_SFEATURES`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_FEATURES_HEADER`` nested request header
``ETHTOOL_A_FEATURES_WANTED`` bitset requested features
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_FEATURES_HEADER`` nested reply header
``ETHTOOL_A_FEATURES_WANTED`` bitset diff wanted vs. result
``ETHTOOL_A_FEATURES_ACTIVE`` bitset diff old vs. new active
==================================== ====== ==========================
Request contains only one bitset which can be either value/mask pair (request
to change specific feature bits and leave the rest) or only a value (request
to set all features to specified set).
As request is subject to netdev_change_features() sanity checks, optional
kernel reply (can be suppressed by ``ETHTOOL_FLAG_OMIT_REPLY`` flag in request
header) informs client about the actual result. ``ETHTOOL_A_FEATURES_WANTED``
reports the difference between client request and actual result: mask consists
of bits which differ between requested features and result (dev->features
after the operation), value consists of values of these bits in the request
(i.e. negated values from resulting features). ``ETHTOOL_A_FEATURES_ACTIVE``
reports the difference between old and new dev->features: mask consists of
bits which have changed, values are their values in new dev->features (after
the operation).
``ETHTOOL_MSG_FEATURES_NTF`` notification is sent not only if device features
are modified using ``ETHTOOL_MSG_FEATURES_SET`` request or on of ethtool ioctl
request but also each time features are modified with netdev_update_features()
or netdev_change_features().
PRIVFLAGS_GET
=============
Gets private flags like ``ETHTOOL_GPFLAGS`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_PRIVFLAGS_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
==================================== ====== ==========================
``ETHTOOL_A_PRIVFLAGS_HEADER`` nested reply header
``ETHTOOL_A_PRIVFLAGS_FLAGS`` bitset private flags
==================================== ====== ==========================
``ETHTOOL_A_PRIVFLAGS_FLAGS`` is a bitset with values of device private flags.
These flags are defined by driver, their number and names (and also meaning)
are device dependent. For compact bitset format, names can be retrieved as
``ETH_SS_PRIV_FLAGS`` string set. If verbose bitset format is requested,
response uses all private flags supported by the device as mask so that client
gets the full information without having to fetch the string set with names.
PRIVFLAGS_SET
=============
Sets or modifies values of device private flags like ``ETHTOOL_SPFLAGS``
ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_PRIVFLAGS_HEADER`` nested request header
``ETHTOOL_A_PRIVFLAGS_FLAGS`` bitset private flags
==================================== ====== ==========================
``ETHTOOL_A_PRIVFLAGS_FLAGS`` can either set the whole set of private flags or
modify only values of some of them.
RINGS_GET
=========
Gets ring sizes like ``ETHTOOL_GRINGPARAM`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_RINGS_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
======================================= ====== ===========================
``ETHTOOL_A_RINGS_HEADER`` nested reply header
``ETHTOOL_A_RINGS_RX_MAX`` u32 max size of RX ring
``ETHTOOL_A_RINGS_RX_MINI_MAX`` u32 max size of RX mini ring
``ETHTOOL_A_RINGS_RX_JUMBO_MAX`` u32 max size of RX jumbo ring
``ETHTOOL_A_RINGS_TX_MAX`` u32 max size of TX ring
``ETHTOOL_A_RINGS_RX`` u32 size of RX ring
``ETHTOOL_A_RINGS_RX_MINI`` u32 size of RX mini ring
``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring
``ETHTOOL_A_RINGS_TX`` u32 size of TX ring
``ETHTOOL_A_RINGS_RX_BUF_LEN`` u32 size of buffers on the ring
``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` u8 TCP header / data split
``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE
``ETHTOOL_A_RINGS_TX_PUSH`` u8 flag of TX Push mode
``ETHTOOL_A_RINGS_RX_PUSH`` u8 flag of RX Push mode
``ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN`` u32 size of TX push buffer
``ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN_MAX`` u32 max size of TX push buffer
``ETHTOOL_A_RINGS_HDS_THRESH`` u32 threshold of
header / data split
``ETHTOOL_A_RINGS_HDS_THRESH_MAX`` u32 max threshold of
header / data split
======================================= ====== ===========================
``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` indicates whether the device is usable with
page-flipping TCP zero-copy receive (``getsockopt(TCP_ZEROCOPY_RECEIVE)``).
If enabled the device is configured to place frame headers and data into
separate buffers. The device configuration must make it possible to receive
full memory pages of data, for example because MTU is high enough or through
HW-GRO.
``ETHTOOL_A_RINGS_[RX|TX]_PUSH`` flag is used to enable descriptor fast
path to send or receive packets. In ordinary path, driver fills descriptors in DRAM and
notifies NIC hardware. In fast path, driver pushes descriptors to the device
through MMIO writes, thus reducing the latency. However, enabling this feature
may increase the CPU cost. Drivers may enforce additional per-packet
eligibility checks (e.g. on packet size).
``ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN`` specifies the maximum number of bytes of a
transmitted packet a driver can push directly to the underlying device
('push' mode). Pushing some of the payload bytes to the device has the
advantages of reducing latency for small packets by avoiding DMA mapping (same
as ``ETHTOOL_A_RINGS_TX_PUSH`` parameter) as well as allowing the underlying
device to process packet headers ahead of fetching its payload.
This can help the device to make fast actions based on the packet's headers.
This is similar to the "tx-copybreak" parameter, which copies the packet to a
preallocated DMA memory area instead of mapping new memory. However,
tx-push-buff parameter copies the packet directly to the device to allow the
device to take faster actions on the packet.
RINGS_SET
=========
Sets ring sizes like ``ETHTOOL_SRINGPARAM`` ioctl request.
Request contents:
==================================== ====== ===========================
``ETHTOOL_A_RINGS_HEADER`` nested reply header
``ETHTOOL_A_RINGS_RX`` u32 size of RX ring
``ETHTOOL_A_RINGS_RX_MINI`` u32 size of RX mini ring
``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring
``ETHTOOL_A_RINGS_TX`` u32 size of TX ring
``ETHTOOL_A_RINGS_RX_BUF_LEN`` u32 size of buffers on the ring
``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` u8 TCP header / data split
``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE
``ETHTOOL_A_RINGS_TX_PUSH`` u8 flag of TX Push mode
``ETHTOOL_A_RINGS_RX_PUSH`` u8 flag of RX Push mode
``ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN`` u32 size of TX push buffer
``ETHTOOL_A_RINGS_HDS_THRESH`` u32 threshold of header / data split
==================================== ====== ===========================
Kernel checks that requested ring sizes do not exceed limits reported by
driver. Driver may impose additional constraints and may not support all
attributes.
``ETHTOOL_A_RINGS_CQE_SIZE`` specifies the completion queue event size.
Completion queue events (CQE) are the events posted by NIC to indicate the
completion status of a packet when the packet is sent (like send success or
error) or received (like pointers to packet fragments). The CQE size parameter
enables to modify the CQE size other than default size if NIC supports it.
A bigger CQE can have more receive buffer pointers, and in turn the NIC can
transfer a bigger frame from wire. Based on the NIC hardware, the overall
completion queue size can be adjusted in the driver if CQE size is modified.
``ETHTOOL_A_RINGS_HDS_THRESH`` specifies the threshold value of
header / data split feature. If a received packet size is larger than this
threshold value, header and data will be split.
CHANNELS_GET
============
Gets channel counts like ``ETHTOOL_GCHANNELS`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_CHANNELS_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
===================================== ====== ==========================
``ETHTOOL_A_CHANNELS_HEADER`` nested reply header
``ETHTOOL_A_CHANNELS_RX_MAX`` u32 max receive channels
``ETHTOOL_A_CHANNELS_TX_MAX`` u32 max transmit channels
``ETHTOOL_A_CHANNELS_OTHER_MAX`` u32 max other channels
``ETHTOOL_A_CHANNELS_COMBINED_MAX`` u32 max combined channels
``ETHTOOL_A_CHANNELS_RX_COUNT`` u32 receive channel count
``ETHTOOL_A_CHANNELS_TX_COUNT`` u32 transmit channel count
``ETHTOOL_A_CHANNELS_OTHER_COUNT`` u32 other channel count
``ETHTOOL_A_CHANNELS_COMBINED_COUNT`` u32 combined channel count
===================================== ====== ==========================
CHANNELS_SET
============
Sets channel counts like ``ETHTOOL_SCHANNELS`` ioctl request.
Request contents:
===================================== ====== ==========================
``ETHTOOL_A_CHANNELS_HEADER`` nested request header
``ETHTOOL_A_CHANNELS_RX_COUNT`` u32 receive channel count
``ETHTOOL_A_CHANNELS_TX_COUNT`` u32 transmit channel count
``ETHTOOL_A_CHANNELS_OTHER_COUNT`` u32 other channel count
``ETHTOOL_A_CHANNELS_COMBINED_COUNT`` u32 combined channel count
===================================== ====== ==========================
Kernel checks that requested channel counts do not exceed limits reported by
driver. Driver may impose additional constraints and may not support all
attributes.
COALESCE_GET
============
Gets coalescing parameters like ``ETHTOOL_GCOALESCE`` ioctl request.
Request contents:
==================================== ====== ==========================
``ETHTOOL_A_COALESCE_HEADER`` nested request header
==================================== ====== ==========================
Kernel response contents:
=========================================== ====== =======================
``ETHTOOL_A_COALESCE_HEADER`` nested reply header
``ETHTOOL_A_COALESCE_RX_USECS`` u32 delay (us), normal Rx
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES`` u32 max packets, normal Rx
``ETHTOOL_A_COALESCE_RX_USECS_IRQ`` u32 delay (us), Rx in IRQ
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_IRQ`` u32 max packets, Rx in IRQ
``ETHTOOL_A_COALESCE_TX_USECS`` u32 delay (us), normal Tx
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES`` u32 max packets, normal Tx
``ETHTOOL_A_COALESCE_TX_USECS_IRQ`` u32 delay (us), Tx in IRQ
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_IRQ`` u32 IRQ packets, Tx in IRQ
``ETHTOOL_A_COALESCE_STATS_BLOCK_USECS`` u32 delay of stats update
``ETHTOOL_A_COALESCE_USE_ADAPTIVE_RX`` bool adaptive Rx coalesce
``ETHTOOL_A_COALESCE_USE_ADAPTIVE_TX`` bool adaptive Tx coalesce
``ETHTOOL_A_COALESCE_PKT_RATE_LOW`` u32 threshold for low rate
``ETHTOOL_A_COALESCE_RX_USECS_LOW`` u32 delay (us), low Rx
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_LOW`` u32 max packets, low Rx
``ETHTOOL_A_COALESCE_TX_USECS_LOW`` u32 delay (us), low Tx
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_LOW`` u32 max packets, low Tx
``ETHTOOL_A_COALESCE_PKT_RATE_HIGH`` u32 threshold for high rate
``ETHTOOL_A_COALESCE_RX_USECS_HIGH`` u32 delay (us), high Rx
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_HIGH`` u32 max packets, high Rx
``ETHTOOL_A_COALESCE_TX_USECS_HIGH`` u32 delay (us), high Tx
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH`` u32 max packets, high Tx
``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL`` u32 rate sampling interval
``ETHTOOL_A_COALESCE_USE_CQE_TX`` bool timer reset mode, Tx
``ETHTOOL_A_COALESCE_USE_CQE_RX`` bool timer reset mode, Rx
``ETHTOOL_A_COALESCE_TX_AGGR_MAX_BYTES`` u32 max aggr size, Tx
``ETHTOOL_A_COALESCE_TX_AGGR_MAX_FRAMES`` u32 max aggr packets, Tx
``ETHTOOL_A_COALESCE_TX_AGGR_TIME_USECS`` u32 time (us), aggr, Tx
``ETHTOOL_A_COALESCE_RX_PROFILE`` nested profile of DIM, Rx
``ETHTOOL_A_COALESCE_TX_PROFILE`` nested profile of DIM, Tx
=========================================== ====== =======================
Attributes are only included in reply if their value is not zero or the
corresponding bit in ``ethtool_ops::supported_coalesce_params`` is set (i.e.
they are declared as supported by driver).
Timer reset mode (``ETHTOOL_A_COALESCE_USE_CQE_TX`` and
``ETHTOOL_A_COALESCE_USE_CQE_RX``) controls the interaction between packet
arrival and the various time based delay parameters. By default timers are
expected to limit the max delay between any packet arrival/departure and a
corresponding interrupt. In this mode timer should be started by packet
arrival (sometimes delivery of previous interrupt) and reset when interrupt
is delivered.
Setting the appropriate attribute to 1 will enable ``CQE`` mode, where
each packet event resets the timer. In this mode timer is used to force
the interrupt if queue goes idle, while busy queues depend on the packet
limit to trigger interrupts.
Tx aggregation consists of copying frames into a contiguous buffer so that they
can be submitted as a single IO operation. ``ETHTOOL_A_COALESCE_TX_AGGR_MAX_BYTES``
describes the maximum size in bytes for the submitted buffer.
``ETHTOOL_A_COALESCE_TX_AGGR_MAX_FRAMES`` describes the maximum number of frames
that can be aggregated into a single buffer.
``ETHTOOL_A_COALESCE_TX_AGGR_TIME_USECS`` describes the amount of time in usecs,
counted since the first packet arrival in an aggregated block, after which the
block should be sent.
This feature is mainly of interest for specific USB devices which does not cope
well with frequent small-sized URBs transmissions.
``ETHTOOL_A_COALESCE_RX_PROFILE`` and ``ETHTOOL_A_COALESCE_TX_PROFILE`` refer
to DIM parameters, see `Generic Network Dynamic Interrupt Moderation (Net DIM)
<https://www.kernel.org/doc/Documentation/networking/net_dim.rst>`_.
COALESCE_SET
============
Sets coalescing parameters like ``ETHTOOL_SCOALESCE`` ioctl request.
Request contents:
=========================================== ====== =======================
``ETHTOOL_A_COALESCE_HEADER`` nested request header
``ETHTOOL_A_COALESCE_RX_USECS`` u32 delay (us), normal Rx
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES`` u32 max packets, normal Rx
``ETHTOOL_A_COALESCE_RX_USECS_IRQ`` u32 delay (us), Rx in IRQ
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_IRQ`` u32 max packets, Rx in IRQ
``ETHTOOL_A_COALESCE_TX_USECS`` u32 delay (us), normal Tx
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES`` u32 max packets, normal Tx
``ETHTOOL_A_COALESCE_TX_USECS_IRQ`` u32 delay (us), Tx in IRQ
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_IRQ`` u32 IRQ packets, Tx in IRQ
``ETHTOOL_A_COALESCE_STATS_BLOCK_USECS`` u32 delay of stats update
``ETHTOOL_A_COALESCE_USE_ADAPTIVE_RX`` bool adaptive Rx coalesce
``ETHTOOL_A_COALESCE_USE_ADAPTIVE_TX`` bool adaptive Tx coalesce
``ETHTOOL_A_COALESCE_PKT_RATE_LOW`` u32 threshold for low rate
``ETHTOOL_A_COALESCE_RX_USECS_LOW`` u32 delay (us), low Rx
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_LOW`` u32 max packets, low Rx
``ETHTOOL_A_COALESCE_TX_USECS_LOW`` u32 delay (us), low Tx
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_LOW`` u32 max packets, low Tx
``ETHTOOL_A_COALESCE_PKT_RATE_HIGH`` u32 threshold for high rate
``ETHTOOL_A_COALESCE_RX_USECS_HIGH`` u32 delay (us), high Rx
``ETHTOOL_A_COALESCE_RX_MAX_FRAMES_HIGH`` u32 max packets, high Rx
``ETHTOOL_A_COALESCE_TX_USECS_HIGH`` u32 delay (us), high Tx
``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH`` u32 max packets, high Tx
``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL`` u32 rate sampling interval
``ETHTOOL_A_COALESCE_USE_CQE_TX`` bool timer reset mode, Tx
``ETHTOOL_A_COALESCE_USE_CQE_RX`` bool timer reset mode, Rx
``ETHTOOL_A_COALESCE_TX_AGGR_MAX_BYTES`` u32 max aggr size, Tx
``ETHTOOL_A_COALESCE_TX_AGGR_MAX_FRAMES`` u32 max aggr packets, Tx
``ETHTOOL_A_COALESCE_TX_AGGR_TIME_USECS`` u32 time (us), aggr, Tx
``ETHTOOL_A_COALESCE_RX_PROFILE`` nested profile of DIM, Rx
``ETHTOOL_A_COALESCE_TX_PROFILE`` nested profile of DIM, Tx
=========================================== ====== =======================
Request is rejected if it attributes declared as unsupported by driver (i.e.
such that the corresponding bit in ``ethtool_ops::supported_coalesce_params``
is not set), regardless of their values. Driver may impose additional
constraints on coalescing parameters and their values.
Compared to requests issued via the ``ioctl()`` netlink version of this request
will try harder to make sure that values specified by the user have been applied
and may call the driver twice.
PAUSE_GET
=========
Gets pause frame settings like ``ETHTOOL_GPAUSEPARAM`` ioctl request.
Request contents:
===================================== ====== ==========================
``ETHTOOL_A_PAUSE_HEADER`` nested request header
``ETHTOOL_A_PAUSE_STATS_SRC`` u32 source of statistics
===================================== ====== ==========================
``ETHTOOL_A_PAUSE_STATS_SRC`` is optional. It takes values from:
.. kernel-doc:: include/uapi/linux/ethtool.h
:identifiers: ethtool_mac_stats_src
If absent from the request, stats will be provided with
an ``ETHTOOL_A_PAUSE_STATS_SRC`` attribute in the response equal to
``ETHTOOL_MAC_STATS_SRC_AGGREGATE``.
Kernel response contents:
===================================== ====== ==========================
``ETHTOOL_A_PAUSE_HEADER`` nested request header
``ETHTOOL_A_PAUSE_AUTONEG`` bool pause autonegotiation
``ETHTOOL_A_PAUSE_RX`` bool receive pause frames
``ETHTOOL_A_PAUSE_TX`` bool transmit pause frames
``ETHTOOL_A_PAUSE_STATS`` nested pause statistics
===================================== ====== ==========================
``ETHTOOL_A_PAUSE_STATS`` are reported if ``ETHTOOL_FLAG_STATS`` was set
in ``ETHTOOL_A_HEADER_FLAGS``.
It will be empty if driver did not report any statistics. Drivers fill in
the statistics in the following structure:
.. kernel-doc:: include/linux/ethtool.h
:identifiers: ethtool_pause_stats
Each member has a corresponding attribute defined.
PAUSE_SET
=========
Sets pause parameters like ``ETHTOOL_GPAUSEPARAM`` ioctl request.
Request contents:
===================================== ====== ==========================
``ETHTOOL_A_PAUSE_HEADER`` nested request header
``ETHTOOL_A_PAUSE_AUTONEG`` bool pause autonegotiation
``ETHTOOL_A_PAUSE_RX`` bool receive pause frames
``ETHTOOL_A_PAUSE_TX`` bool transmit pause frames
===================================== ====== ==========================
EEE_GET
=======
Gets Energy Efficient Ethernet settings like ``ETHTOOL_GEEE`` ioctl request.
Request contents:
===================================== ====== ==========================
``ETHTOOL_A_EEE_HEADER`` nested request header
===================================== ====== ==========================
Kernel response contents:
===================================== ====== ==========================
``ETHTOOL_A_EEE_HEADER`` nested request header
``ETHTOOL_A_EEE_MODES_OURS`` bool supported/advertised modes
``ETHTOOL_A_EEE_MODES_PEER`` bool peer advertised link modes
``ETHTOOL_A_EEE_ACTIVE`` bool EEE is actively used
``ETHTOOL_A_EEE_ENABLED`` bool EEE is enabled
``ETHTOOL_A_EEE_TX_LPI_ENABLED`` bool Tx lpi enabled
``ETHTOOL_A_EEE_TX_LPI_TIMER`` u32 Tx lpi timeout (in us)
===================================== ====== ==========================
In ``ETHTOOL_A_EEE_MODES_OURS``, mask consists of link modes for which EEE is
enabled, value of link modes for which EEE is advertised. Link modes for which
peer advertises EEE are listed in ``ETHTOOL_A_EEE_MODES_PEER`` (no mask). The
netlink interface allows reporting EEE status for all link modes but only
first 32 are provided by the ``ethtool_ops`` callback.
EEE_SET
=======
Sets Energy Efficient Ethernet parameters like ``ETHTOOL_SEEE`` ioctl request.
Request contents:
===================================== ====== ==========================
``ETHTOOL_A_EEE_HEADER`` nested request header
``ETHTOOL_A_EEE_MODES_OURS`` bool advertised modes
``ETHTOOL_A_EEE_ENABLED`` bool EEE is enabled
``ETHTOOL_A_EEE_TX_LPI_ENABLED`` bool Tx lpi enabled
``ETHTOOL_A_EEE_TX_LPI_TIMER`` u32 Tx lpi timeout (in us)
===================================== ====== ==========================
``ETHTOOL_A_EEE_MODES_OURS`` is used to either list link modes to advertise
EEE for (if there is no mask) or specify changes to the list (if there is
a mask). The netlink interface allows reporting EEE status for all link modes
but only first 32 can be set at the moment as that is what the ``ethtool_ops``
callback supports.
TSINFO_GET
==========
Gets timestamping information like ``ETHTOOL_GET_TS_INFO`` ioctl request.
Request contents:
======================================== ====== ============================
``ETHTOOL_A_TSINFO_HEADER`` nested request header
``ETHTOOL_A_TSINFO_HWTSTAMP_PROVIDER`` nested PTP hw clock provider
======================================== ====== ============================
Kernel response contents:
===================================== ====== ==========================
``ETHTOOL_A_TSINFO_HEADER`` nested request header
``ETHTOOL_A_TSINFO_TIMESTAMPING`` bitset SO_TIMESTAMPING flags
``ETHTOOL_A_TSINFO_TX_TYPES`` bitset supported Tx types
``ETHTOOL_A_TSINFO_RX_FILTERS`` bitset supported Rx filters
``ETHTOOL_A_TSINFO_PHC_INDEX`` u32 PTP hw clock index
``ETHTOOL_A_TSINFO_STATS`` nested HW timestamping statistics
===================================== ====== ==========================
``ETHTOOL_A_TSINFO_PHC_INDEX`` is absent if there is no associated PHC (there
is no special value for this case). The bitset attributes are omitted if they
would be empty (no bit set).
Additional hardware timestamping statistics response contents:
================================================== ====== =====================
``ETHTOOL_A_TS_STAT_TX_PKTS`` uint Packets with Tx
HW timestamps
``ETHTOOL_A_TS_STAT_TX_LOST`` uint Tx HW timestamp
--> --------------------
--> maximum size reached
--> --------------------
