============================= 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 ```` 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. 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_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) ================================= =================================== 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. 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) atrribute 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 ===================================== ================================ 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 ===================================== ================================= ``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 ==================================== ====== ========================== 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_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 and duplex is specified, kernel adjusts advertised modes to all supported modes matching speed, duplex or both (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. At the moment, only link up/down flag (as provided by ``ETHTOOL_GLINK`` ioctl command) is provided but some future extensions are planned (e.g. link down reason). 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) ==================================== ====== ========================== 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. ``LINKSTATE_GET`` allows dump requests (kernel returns reply messages for all devices supporting the request). 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 constains 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 ==================================== ====== ========================== 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 ==================================== ====== ========================== Kernel checks that requested ring sizes do not exceed limits reported by driver. Driver may impose additional constraints and may not suspport all attributes. 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 suspport 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 =========================================== ====== ======================= 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). 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 =========================================== ====== ======================= 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. PAUSE_GET ============ Gets channel counts like ``ETHTOOL_GPAUSE`` ioctl request. Request contents: ===================================== ====== ========================== ``ETHTOOL_A_PAUSE_HEADER`` nested request header ===================================== ====== ========================== 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 ===================================== ====== ========================== 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 channel counts 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 pause parameters like ``ETHTOOL_GEEEPARAM`` 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 ===================================== ====== ========================== 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_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). Request translation =================== The following table maps ioctl commands to netlink commands providing their functionality. Entries with "n/a" in right column are commands which do not have their netlink replacement yet. =================================== ===================================== ioctl command netlink command =================================== ===================================== ``ETHTOOL_GSET`` ``ETHTOOL_MSG_LINKINFO_GET`` ``ETHTOOL_MSG_LINKMODES_GET`` ``ETHTOOL_SSET`` ``ETHTOOL_MSG_LINKINFO_SET`` ``ETHTOOL_MSG_LINKMODES_SET`` ``ETHTOOL_GDRVINFO`` n/a ``ETHTOOL_GREGS`` n/a ``ETHTOOL_GWOL`` ``ETHTOOL_MSG_WOL_GET`` ``ETHTOOL_SWOL`` ``ETHTOOL_MSG_WOL_SET`` ``ETHTOOL_GMSGLVL`` ``ETHTOOL_MSG_DEBUG_GET`` ``ETHTOOL_SMSGLVL`` ``ETHTOOL_MSG_DEBUG_SET`` ``ETHTOOL_NWAY_RST`` n/a ``ETHTOOL_GLINK`` ``ETHTOOL_MSG_LINKSTATE_GET`` ``ETHTOOL_GEEPROM`` n/a ``ETHTOOL_SEEPROM`` n/a ``ETHTOOL_GCOALESCE`` ``ETHTOOL_MSG_COALESCE_GET`` ``ETHTOOL_SCOALESCE`` ``ETHTOOL_MSG_COALESCE_SET`` ``ETHTOOL_GRINGPARAM`` ``ETHTOOL_MSG_RINGS_GET`` ``ETHTOOL_SRINGPARAM`` ``ETHTOOL_MSG_RINGS_SET`` ``ETHTOOL_GPAUSEPARAM`` ``ETHTOOL_MSG_PAUSE_GET`` ``ETHTOOL_SPAUSEPARAM`` ``ETHTOOL_MSG_PAUSE_SET`` ``ETHTOOL_GRXCSUM`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SRXCSUM`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GTXCSUM`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_STXCSUM`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GSG`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SSG`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_TEST`` n/a ``ETHTOOL_GSTRINGS`` ``ETHTOOL_MSG_STRSET_GET`` ``ETHTOOL_PHYS_ID`` n/a ``ETHTOOL_GSTATS`` n/a ``ETHTOOL_GTSO`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_STSO`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GPERMADDR`` rtnetlink ``RTM_GETLINK`` ``ETHTOOL_GUFO`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SUFO`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GGSO`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SGSO`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GFLAGS`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SFLAGS`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GPFLAGS`` ``ETHTOOL_MSG_PRIVFLAGS_GET`` ``ETHTOOL_SPFLAGS`` ``ETHTOOL_MSG_PRIVFLAGS_SET`` ``ETHTOOL_GRXFH`` n/a ``ETHTOOL_SRXFH`` n/a ``ETHTOOL_GGRO`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SGRO`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GRXRINGS`` n/a ``ETHTOOL_GRXCLSRLCNT`` n/a ``ETHTOOL_GRXCLSRULE`` n/a ``ETHTOOL_GRXCLSRLALL`` n/a ``ETHTOOL_SRXCLSRLDEL`` n/a ``ETHTOOL_SRXCLSRLINS`` n/a ``ETHTOOL_FLASHDEV`` n/a ``ETHTOOL_RESET`` n/a ``ETHTOOL_SRXNTUPLE`` n/a ``ETHTOOL_GRXNTUPLE`` n/a ``ETHTOOL_GSSET_INFO`` ``ETHTOOL_MSG_STRSET_GET`` ``ETHTOOL_GRXFHINDIR`` n/a ``ETHTOOL_SRXFHINDIR`` n/a ``ETHTOOL_GFEATURES`` ``ETHTOOL_MSG_FEATURES_GET`` ``ETHTOOL_SFEATURES`` ``ETHTOOL_MSG_FEATURES_SET`` ``ETHTOOL_GCHANNELS`` ``ETHTOOL_MSG_CHANNELS_GET`` ``ETHTOOL_SCHANNELS`` ``ETHTOOL_MSG_CHANNELS_SET`` ``ETHTOOL_SET_DUMP`` n/a ``ETHTOOL_GET_DUMP_FLAG`` n/a ``ETHTOOL_GET_DUMP_DATA`` n/a ``ETHTOOL_GET_TS_INFO`` ``ETHTOOL_MSG_TSINFO_GET`` ``ETHTOOL_GMODULEINFO`` n/a ``ETHTOOL_GMODULEEEPROM`` n/a ``ETHTOOL_GEEE`` ``ETHTOOL_MSG_EEE_GET`` ``ETHTOOL_SEEE`` ``ETHTOOL_MSG_EEE_SET`` ``ETHTOOL_GRSSH`` n/a ``ETHTOOL_SRSSH`` n/a ``ETHTOOL_GTUNABLE`` n/a ``ETHTOOL_STUNABLE`` n/a ``ETHTOOL_GPHYSTATS`` n/a ``ETHTOOL_PERQUEUE`` n/a ``ETHTOOL_GLINKSETTINGS`` ``ETHTOOL_MSG_LINKINFO_GET`` ``ETHTOOL_MSG_LINKMODES_GET`` ``ETHTOOL_SLINKSETTINGS`` ``ETHTOOL_MSG_LINKINFO_SET`` ``ETHTOOL_MSG_LINKMODES_SET`` ``ETHTOOL_PHY_GTUNABLE`` n/a ``ETHTOOL_PHY_STUNABLE`` n/a ``ETHTOOL_GFECPARAM`` n/a ``ETHTOOL_SFECPARAM`` n/a =================================== =====================================