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ETHTOOL(8) System Manager's Manual ETHTOOL(8) NAME ethtool - query or control network driver and hardware settings SYNOPSIS ethtool devname ethtool -h|--help ethtool --version ethtool [--debug N] args ethtool [--json] args ethtool [-I | --include-statistics] args ethtool --monitor [ command ] [ devname ] ethtool -a|--show-pause devname ethtool -A|--pause devname [autoneg on|off] [rx on|off] [tx on|off] ethtool -c|--show-coalesce devname ethtool -C|--coalesce devname [adaptive-rx on|off] [adaptive-tx on|off] [rx-usecs N] [rx-frames N] [rx-usecs-irq N] [rx-frames-irq N] [tx-usecs N] [tx-frames N] [tx-usecs-irq N] [tx-frames-irq N] [stats-block-usecs N] [pkt-rate-low N] [rx-usecs-low N] [rx-frames-low N] [tx-usecs-low N] [tx-frames-low N] [pkt-rate-high N] [rx-usecs-high N] [rx-frames-high N] [tx-usecs-high N] [tx-frames-high N] [sample-interval N] [cqe-mode-rx on|off] [cqe-mode-tx on|off] ethtool -g|--show-ring devname ethtool -G|--set-ring devname [rx N] [rx-mini N] [rx-jumbo N] [tx N] ethtool -i|--driver devname ethtool -d|--register-dump devname [raw on|off] [hex on|off] [file name] ethtool -e|--eeprom-dump devname [raw on|off] [offset N] [length N] ethtool -E|--change-eeprom devname [magic N] [offset N] [length N] [value N] ethtool -k|--show-features|--show-offload devname ethtool -K|--features|--offload devname feature on|off ... ethtool -p|--identify devname [N] ethtool -P|--show-permaddr devname ethtool -r|--negotiate devname ethtool -S|--statistics devname [--all-groups|--groups [eth-phy] [eth-mac] [eth-ctrl] ] ethtool --phy-statistics devname ethtool -t|--test devname [offline|online|external_lb] ethtool -s devname [speed N] [lanes N] [duplex half|full] [port tp|aui|bnc|mii] [mdix auto|on|off] [autoneg on|off] [advertise N[/M] | advertise mode on|off ...] [phyad N] [xcvr internal|external] [wol N[/M] | wol p|u|m|b|a|g|s|f|d...] [sopass xx:yy:zz:aa:bb:cc] [master-slave preferred-master|preferred-slave|forced- master|forced-slave] [msglvl N[/M] | msglvl type on|off ...] ethtool -n|-u|--show-nfc|--show-ntuple devname [ rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 | rule N ] ethtool -N|-U|--config-nfc|--config-ntuple devname rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r... | flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4|ip6|tcp6|udp6|ah6|esp6|sctp6 [src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [proto N [m N]] [src-ip ip- address [m ip-address]] [dst-ip ip-address [m ip-address]] [tos N [m N]] [tclass N [m N]] [l4proto N [m N]] [src-port N [m N]] [dst-port N [m N]] [spi N [m N]] [l4data N [m N]] [vlan-etype N [m N]] [vlan N [m N]] [user-def N [m N]] [dst- mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [action N] [context N] [loc N] | delete N ethtool -w|--get-dump devname [data filename] ethtool -W|--set-dump devname N ethtool -T|--show-time-stamping devname ethtool -x|--show-rxfh-indir|--show-rxfh devname ethtool -X|--set-rxfh-indir|--rxfh devname [hkey xx:yy:zz:aa:bb:cc:...] [start N] [ equal N | weight W0 W1 ... | default ] [hfunc FUNC] [context CTX | new] [delete] ethtool -f|--flash devname file [N] ethtool -l|--show-channels devname ethtool -L|--set-channels devname [rx N] [tx N] [other N] [combined N] ethtool -m|--dump-module-eeprom|--module-info devname [raw on|off] [hex on|off] [offset N] [length N] [page N] [bank N] [i2c N] ethtool --show-priv-flags devname ethtool --set-priv-flags devname flag on|off ... ethtool --show-eee devname ethtool --set-eee devname [eee on|off] [tx-lpi on|off] [tx-timer N] [advertise N] ethtool --set-phy-tunable devname [ downshift on|off [count N] ] [ fast-link-down on|off [msecs N] ] [ energy-detect-power-down on|off [msecs N] ] ethtool --get-phy-tunable devname [downshift] [fast-link-down] [energy-detect-power-down] ethtool --get-tunable devname [rx-copybreak] [tx-copybreak] [pfc-prevention-tout] ethtool --set-tunable devname [rx-copybreak N] [tx-copybreak N] [pfc-prevention-tout N] ethtool --reset devname [flags N] [mgmt] [mgmt-shared] [irq] [irq-shared] [dma] [dma-shared] [filter] [filter-shared] [offload] [offload-shared] [mac] [mac-shared] [phy] [phy- shared] [ram] [ram-shared] [ap] [ap-shared] [dedicated] [all] ethtool --show-fec devname ethtool --set-fec devname encoding auto|off|rs|baser|llrs [...] ethtool -Q|--per-queue devname [queue_mask %x] sub_command ... . ethtool --cable-test devname ethtool --cable-test-tdr devname [first N] [last N] [step N] [pair N] ethtool --show-tunnels devname DESCRIPTION ethtool is used to query and control network device driver and hardware settings, particular‐ ly for wired Ethernet devices. devname is the name of the network device on which ethtool should operate. OPTIONS ethtool with a single argument specifying the device name prints current settings of the specified device. -h --help Shows a short help message. --version Shows the ethtool version number. --debug N Turns on debugging messages. Argument is interpreted as a mask: 0x01 Parser information --json Output results in JavaScript Object Notation (JSON). Only a subset of options support this. Those which do not will continue to output plain text in the presence of this option. -I --include-statistics Include command-related statistics in the output. This option allows displaying rele‐ vant device statistics for selected get commands. -a --show-pause Queries the specified Ethernet device for pause parameter information. -A --pause Changes the pause parameters of the specified Ethernet device. autoneg on|off Specifies whether pause autonegotiation should be enabled. rx on|off Specifies whether RX pause should be enabled. tx on|off Specifies whether TX pause should be enabled. -c --show-coalesce Queries the specified network device for coalescing information. -C --coalesce Changes the coalescing settings of the specified network device. -g --show-ring Queries the specified network device for rx/tx ring parameter information. -G --set-ring Changes the rx/tx ring parameters of the specified network device. rx N Changes the number of ring entries for the Rx ring. rx-mini N Changes the number of ring entries for the Rx Mini ring. rx-jumbo N Changes the number of ring entries for the Rx Jumbo ring. tx N Changes the number of ring entries for the Tx ring. -i --driver Queries the specified network device for associated driver information. -d --register-dump Retrieves and prints a register dump for the specified network device. The register format for some devices is known and decoded others are printed in hex. When raw is enabled, then ethtool dumps the raw register data to stdout. If file is specified, then use contents of previous raw register dump, rather than reading from the device. -e --eeprom-dump Retrieves and prints an EEPROM dump for the specified network device. When raw is en‐ abled, then it dumps the raw EEPROM data to stdout. The length and offset parameters allow dumping certain portions of the EEPROM. Default is to dump the entire EEPROM. raw on|off offset N length N -E --change-eeprom If value is specified, changes EEPROM byte for the specified network device. offset and value specify which byte and it's new value. If value is not specified, stdin is read and written to the EEPROM. The length and offset parameters allow writing to cer‐ tain portions of the EEPROM. Because of the persistent nature of writing to the EEP‐ ROM, a device-specific magic key must be specified to prevent the accidental writing to the EEPROM. -k --show-features --show-offload Queries the specified network device for the state of protocol offload and other fea‐ tures. -K --features --offload Changes the offload parameters and other features of the specified network device. The following feature names are built-in and others may be defined by the kernel. rx on|off Specifies whether RX checksumming should be enabled. tx on|off Specifies whether TX checksumming should be enabled. sg on|off Specifies whether scatter-gather should be enabled. tso on|off Specifies whether TCP segmentation offload should be enabled. ufo on|off Specifies whether UDP fragmentation offload should be enabled gso on|off Specifies whether generic segmentation offload should be enabled gro on|off Specifies whether generic receive offload should be enabled lro on|off Specifies whether large receive offload should be enabled rxvlan on|off Specifies whether RX VLAN acceleration should be enabled txvlan on|off Specifies whether TX VLAN acceleration should be enabled ntuple on|off Specifies whether Rx ntuple filters and actions should be enabled rxhash on|off Specifies whether receive hashing offload should be enabled -p --identify Initiates adapter-specific action intended to enable an operator to easily identify the adapter by sight. Typically this involves blinking one or more LEDs on the spe‐ cific network port. [ N] Length of time to perform phys-id, in seconds. -P --show-permaddr Queries the specified network device for permanent hardware address. -r --negotiate Restarts auto-negotiation on the specified Ethernet device, if auto-negotiation is en‐ abled. -S --statistics Queries the specified network device for standard (IEEE, IETF, etc.), or NIC- and driver-specific statistics. NIC- and driver-specific statistics are requested when no group of statistics is specified. NIC- and driver-specific statistics and standard statistics are independent, devices may implement either, both or none. There is little commonality between naming of NIC- and driver-specific statistics across vendors. --all-groups --groups [eth-phy] [eth-mac] [eth-ctrl] [rmon] Request groups of standard device statistics. --phy-statistics Queries the specified network device for PHY specific statistics. -t --test Executes adapter selftest on the specified network device. Possible test modes are: offline Perform full set of tests, possibly interrupting normal operation during the tests, online Perform limited set of tests, not interrupting normal operation, external_lb Perform full set of tests, as for offline, and additionally an external-loopback test. -s --change Allows changing some or all settings of the specified network device. All following options only apply if -s was specified. speed N Set speed in Mb/s. ethtool with just the device name as an argument will show you the supported device speeds. lanes N Set number of lanes. duplex half|full Sets full or half duplex mode. port tp|aui|bnc|mii Selects device port. master-slave preferred-master|preferred-slave|forced-master|forced-slave Configure MASTER/SLAVE role of the PHY. When the PHY is configured as MASTER, the PMA Transmit function shall source TX_TCLK from a local clock source. When config‐ ured as SLAVE, the PMA Transmit function shall source TX_TCLK from the clock re‐ covered from data stream provided by MASTER. Not all devices support this. preferred-master Prefer MASTER role on autonegotiation preferred-slave Prefer SLAVE role on autonegotiation forced-master Force the PHY in MASTER role. Can be used without autonegotiation forced-slave Force the PHY in SLAVE role. Can be used without autonegotiation mdix auto|on|off Selects MDI-X mode for port. May be used to override the automatic detection fea‐ ture of most adapters. An argument of auto means automatic detection of MDI sta‐ tus, on forces MDI-X (crossover) mode, while off means MDI (straight through) mode. The driver should guarantee that this command takes effect immediately, and if necessary may reset the link to cause the change to take effect. autoneg on|off Specifies whether autonegotiation should be enabled. Autonegotiation is enabled by default, but in some network devices may have trouble with it, so you can disable it if really necessary. advertise N Sets the speed and duplex advertised by autonegotiation. The argument is a hexa‐ decimal value using one or a combination of the following values: 0x001 10baseT Half 0x002 10baseT Full 0x004 100baseT Half 0x008 100baseT Full 0x80000000000000000 100baseT1 Full 0x40000000000000000000000 100baseFX Half 0x80000000000000000000000 100baseFX Full 0x010 1000baseT Half (not supported by IEEE standards) 0x020 1000baseT Full 0x20000 1000baseKX Full 0x20000000000 1000baseX Full 0x100000000000000000 1000baseT1 Full 0x8000 2500baseX Full (not supported by IEEE standards) 0x800000000000 2500baseT Full 0x1000000000000 5000baseT Full 0x1000 10000baseT Full 0x40000 10000baseKX4 Full 0x80000 10000baseKR Full 0x100000 10000baseR_FEC 0x40000000000 10000baseCR Full 0x80000000000 10000baseSR Full 0x100000000000 10000baseLR Full 0x200000000000 10000baseLRM Full 0x400000000000 10000baseER Full 0x200000 20000baseMLD2 Full (not supported by IEEE standards) 0x400000 20000baseKR2 Full (not supported by IEEE standards) 0x80000000 25000baseCR Full 0x100000000 25000baseKR Full 0x200000000 25000baseSR Full 0x800000 40000baseKR4 Full 0x1000000 40000baseCR4 Full 0x2000000 40000baseSR4 Full 0x4000000 40000baseLR4 Full 0x400000000 50000baseCR2 Full 0x800000000 50000baseKR2 Full 0x10000000000 50000baseSR2 Full 0x10000000000000 50000baseKR Full 0x20000000000000 50000baseSR Full 0x40000000000000 50000baseCR Full 0x80000000000000 50000baseLR_ER_FR Full 0x100000000000000 50000baseDR Full 0x8000000 56000baseKR4 Full 0x10000000 56000baseCR4 Full 0x20000000 56000baseSR4 Full 0x40000000 56000baseLR4 Full 0x1000000000 100000baseKR4 Full 0x2000000000 100000baseSR4 Full 0x4000000000 100000baseCR4 Full 0x8000000000 100000baseLR4_ER4 Full 0x200000000000000 100000baseKR2 Full 0x400000000000000 100000baseSR2 Full 0x800000000000000 100000baseCR2 Full 0x1000000000000000 100000baseLR2_ER2_FR2 Full 0x2000000000000000 100000baseDR2 Full 0x8000000000000000000 100000baseKR Full 0x10000000000000000000 100000baseSR Full 0x20000000000000000000 100000baseLR_ER_FR Full 0x40000000000000000000 100000baseCR Full 0x80000000000000000000 100000baseDR Full 0x4000000000000000 200000baseKR4 Full 0x8000000000000000 200000baseSR4 Full 0x10000000000000000 200000baseLR4_ER4_FR4 Full 0x20000000000000000 200000baseDR4 Full 0x40000000000000000 200000baseCR4 Full 0x100000000000000000000 200000baseKR2 Full 0x200000000000000000000 200000baseSR2 Full 0x400000000000000000000 200000baseLR2_ER2_FR2 Full 0x800000000000000000000 200000baseDR2 Full 0x1000000000000000000000 200000baseCR2 Full 0x200000000000000000 400000baseKR8 Full 0x400000000000000000 400000baseSR8 Full 0x800000000000000000 400000baseLR8_ER8_FR8 Full 0x1000000000000000000 400000baseDR8 Full 0x2000000000000000000 400000baseCR8 Full 0x2000000000000000000000 400000baseKR4 Full 0x4000000000000000000000 400000baseSR4 Full 0x8000000000000000000000 400000baseLR4_ER4_FR4 Full 0x10000000000000000000000 400000baseDR4 Full 0x20000000000000000000000 400000baseCR4 Full phyad N PHY address. xcvr internal|external Selects transceiver type. Currently only internal and external can be specified, in the future further types might be added. wol p|u|m|b|a|g|s|f|d... Sets Wake-on-LAN options. Not all devices support this. The argument to this op‐ tion is a string of characters specifying which options to enable. p Wake on PHY activity u Wake on unicast messages m Wake on multicast messages b Wake on broadcast messages a Wake on ARP g Wake on MagicPacket™ s Enable SecureOn™ password for MagicPacket™ f Wake on filter(s) d Disable (wake on nothing). This option clears all previous options. sopass xx:yy:zz:aa:bb:cc Sets the SecureOn™ password. The argument to this option must be 6 bytes in Eth‐ ernet MAC hex format (xx:yy:zz:aa:bb:cc). msglvl N msglvl type on|off ... Sets the driver message type flags by name or number. type names the type of mes‐ sage to enable or disable; N specifies the new flags numerically. The defined type names and numbers are: drv 0x0001 General driver status probe 0x0002 Hardware probing link 0x0004 Link state timer 0x0008 Periodic status check ifdown 0x0010 Interface being brought down ifup 0x0020 Interface being brought up rx_err 0x0040 Receive error tx_err 0x0080 Transmit error tx_queued 0x0100 Transmit queueing intr 0x0200 Interrupt handling tx_done 0x0400 Transmit completion rx_status 0x0800 Receive completion pktdata 0x1000 Packet contents hw 0x2000 Hardware status wol 0x4000 Wake-on-LAN status The precise meanings of these type flags differ between drivers. -n -u --show-nfc --show-ntuple Retrieves receive network flow classification options or rules. rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 Retrieves the hash options for the specified flow type. tcp4 TCP over IPv4 udp4 UDP over IPv4 ah4 IPSEC AH over IPv4 esp4 IPSEC ESP over IPv4 sctp4 SCTP over IPv4 tcp6 TCP over IPv6 udp6 UDP over IPv6 ah6 IPSEC AH over IPv6 esp6 IPSEC ESP over IPv6 sctp6 SCTP over IPv6 rule N Retrieves the RX classification rule with the given ID. -N -U --config-nfc --config-ntuple Configures receive network flow classification options or rules. rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6m|v|t|s|d|f|n|r... Configures the hash options for the specified flow type. m Hash on the Layer 2 destination address of the rx packet. v Hash on the VLAN tag of the rx packet. t Hash on the Layer 3 protocol field of the rx packet. s Hash on the IP source address of the rx packet. d Hash on the IP destination address of the rx packet. f Hash on bytes 0 and 1 of the Layer 4 header of the rx packet. n Hash on bytes 2 and 3 of the Layer 4 header of the rx packet. r Discard all packets of this flow type. When this option is set, all other options are ignored. flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4|ip6|tcp6|udp6|ah6|esp6|sctp6 Inserts or updates a classification rule for the specified flow type. ether Ethernet ip4 Raw IPv4 tcp4 TCP over IPv4 udp4 UDP over IPv4 sctp4 SCTP over IPv4 ah4 IPSEC AH over IPv4 esp4 IPSEC ESP over IPv4 ip6 Raw IPv6 tcp6 TCP over IPv6 udp6 UDP over IPv6 sctp6 SCTP over IPv6 ah6 IPSEC AH over IPv6 esp6 IPSEC ESP over IPv6 For all fields that allow both a value and a mask to be specified, the mask may be speci‐ fied immediately after the value using the m keyword, or separately using the field name keyword with -mask appended, e.g. src-mask. src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc] Includes the source MAC address, specified as 6 bytes in hexadecimal separated by colons, along with an optional mask. Valid only for flow-type ether. dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc] Includes the destination MAC address, specified as 6 bytes in hexadecimal separat‐ ed by colons, along with an optional mask. Valid only for flow-type ether. proto N [m N] Includes the Ethernet protocol number (ethertype) and an optional mask. Valid on‐ ly for flow-type ether. src-ip ip-address [m ip-address] Specify the source IP address of the incoming packet to match along with an op‐ tional mask. Valid for all IP based flow-types. dst-ip ip-address [m ip-address] Specify the destination IP address of the incoming packet to match along with an optional mask. Valid for all IP based flow-types. tos N [m N] Specify the value of the Type of Service field in the incoming packet to match along with an optional mask. Applies to all IPv4 based flow-types. tclass N [m N] Specify the value of the Traffic Class field in the incoming packet to match along with an optional mask. Applies to all IPv6 based flow-types. l4proto N [m N] Includes the layer 4 protocol number and optional mask. Valid only for flow-types ip4 and ip6. src-port N [m N] Specify the value of the source port field (applicable to TCP/UDP packets) in the incoming packet to match along with an optional mask. Valid for flow-types ip4, tcp4, udp4, and sctp4 and their IPv6 equivalents. dst-port N [m N] Specify the value of the destination port field (applicable to TCP/UDP packets)in the incoming packet to match along with an optional mask. Valid for flow-types ip4, tcp4, udp4, and sctp4 and their IPv6 equivalents. spi N [m N] Specify the value of the security parameter index field (applicable to AH/ESP packets)in the incoming packet to match along with an optional mask. Valid for flow-types ip4, ah4, and esp4 and their IPv6 equivalents. l4data N [m N] Specify the value of the first 4 Bytes of Layer 4 in the incoming packet to match along with an optional mask. Valid for ip4 and ip6 flow-types. vlan-etype N [m N] Includes the VLAN tag Ethertype and an optional mask. vlan N [m N] Includes the VLAN tag and an optional mask. user-def N [m N] Includes 64-bits of user-specific data and an optional mask. dst-mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc] Includes the destination MAC address, specified as 6 bytes in hexadecimal separat‐ ed by colons, along with an optional mask. Valid for all IP based flow-types. action N Specifies the Rx queue to send packets to, or some other action. -1 Drop the matched flow -2 Use the matched flow as a Wake-on-LAN filter 0 or higher Rx queue to route the flow context N Specifies the RSS context to spread packets over multiple queues; either 0 for the default RSS context, or a value returned by ethtool -X ... context new. vf N Specifies the Virtual Function the filter applies to. Not compatible with action. queue N Specifies the Rx queue to send packets to. Not compatible with action. loc N Specify the location/ID to insert the rule. This will overwrite any rule present in that location and will not go through any of the rule ordering process. delete N Deletes the RX classification rule with the given ID. -w --get-dump Retrieves and prints firmware dump for the specified network device. By default, it prints out the dump flag, version and length of the dump data. When data is indicat‐ ed, then ethtool fetches the dump data and directs it to a file. -W --set-dump Sets the dump flag for the device. -T --show-time-stamping Show the device's time stamping capabilities and associated PTP hardware clock. -x --show-rxfh-indir --show-rxfh Retrieves the receive flow hash indirection table and/or RSS hash key. -X --set-rxfh-indir --rxfh Configures the receive flow hash indirection table and/or RSS hash key. hkey Sets RSS hash key of the specified network device. RSS hash key should be of de‐ vice supported length. Hash key format must be in xx:yy:zz:aa:bb:cc format mean‐ ing both the nibbles of a byte should be mentioned even if a nibble is zero. hfunc Sets RSS hash function of the specified network device. List of RSS hash func‐ tions which kernel supports is shown as a part of the --show-rxfh command output. start N For the equal and weight options, sets the starting receive queue for spreading flows to N. equal N Sets the receive flow hash indirection table to spread flows evenly between the first N receive queues. weight W0 W1 ... Sets the receive flow hash indirection table to spread flows between receive queues according to the given weights. The sum of the weights must be non-zero and must not exceed the size of the indirection table. default Sets the receive flow hash indirection table to its default value. context CTX | new Specifies an RSS context to act on; either new to allocate a new RSS context, or CTX, a value returned by a previous ... context new. delete Delete the specified RSS context. May only be used in conjunction with context and a non-zero CTX value. -f --flash Write a firmware image to flash or other non-volatile memory on the device. file Specifies the filename of the firmware image. The firmware must first be in‐ stalled in one of the directories where the kernel firmware loader or firmware agent will look, such as /lib/firmware. N If the device stores multiple firmware images in separate regions of non-volatile memory, this parameter may be used to specify which region is to be written. The default is 0, requesting that all regions are written. All other values are driv‐ er-dependent. -l --show-channels Queries the specified network device for the numbers of channels it has. A channel is an IRQ and the set of queues that can trigger that IRQ. -L --set-channels Changes the numbers of channels of the specified network device. rx N Changes the number of channels with only receive queues. tx N Changes the number of channels with only transmit queues. other N Changes the number of channels used only for other purposes e.g. link interrupts or SR-IOV co-ordination. combined N Changes the number of multi-purpose channels. -m --dump-module-eeprom --module-info Retrieves and if possible decodes the EEPROM from plugin modules, e.g SFP+, QSFP. If the driver and module support it, the optical diagnostic information is also read and decoded. When either one of page, bank or i2c parameters is specified, dumps only of a single page or its portion is allowed. In such a case offset and length parameters are treated relatively to EEPROM page boundaries. --show-priv-flags Queries the specified network device for its private flags. The names and meanings of private flags (if any) are defined by each network device driver. --set-priv-flags Sets the device's private flags as specified. flag on|off Sets the state of the named private flag. --show-eee Queries the specified network device for its support of Energy-Efficient Ethernet (ac‐ cording to the IEEE 802.3az specifications) --set-eee Sets the device EEE behaviour. eee on|off Enables/disables the device support of EEE. tx-lpi on|off Determines whether the device should assert its Tx LPI. advertise N Sets the speeds for which the device should advertise EEE capabilities. Values are as for --change advertise tx-timer N Sets the amount of time the device should stay in idle mode prior to asserting its Tx LPI (in microseconds). This has meaning only when Tx LPI is enabled. --set-phy-tunable Sets the PHY tunable parameters. downshift on|off Specifies whether downshift should be enabled. count N Sets the PHY downshift re-tries count. fast-link-down on|off Specifies whether Fast Link Down should be enabled and time until link down (if supported). msecs N Sets the period after which the link is reported as down. Note that the PHY may choose the closest supported value. Only on reading back the tunable do you get the actual value. energy-detect-power-down on|off Specifies whether Energy Detect Power Down (EDPD) should be enabled (if support‐ ed). This will put the RX and TX circuit blocks into a low power mode, and the PHY will wake up periodically to send link pulses to avoid any lock-up situation with a peer PHY that may also have EDPD enabled. By default, this setting will al‐ so enable the periodic transmission of TX pulses. msecs N Some PHYs support configuration of the wake-up interval to send TX pulses. This setting allows the control of this interval, and 0 disables TX pulses if the PHY supports this. Disabling TX pulses can create a lock-up situation where neither of the PHYs wakes the other one. If unspecified the default value (in milliseconds) will be used by the PHY. --get-phy-tunable Gets the PHY tunable parameters. downshift For operation in cabling environments that are incompatible with 1000BASE-T, PHY device provides an automatic link speed downshift operation. Link speed downshift after N failed 1000BASE-T auto-negotiation attempts. Downshift is useful where cable does not have the 4 pairs instance. Gets the PHY downshift count/status. fast-link-down Depending on the mode it may take 0.5s - 1s until a broken link is reported as down. In certain use cases a link-down event needs to be reported as soon as pos‐ sible. Some PHYs support a Fast Link Down Feature and may allow configuration of the delay before a broken link is reported as being down. Gets the PHY Fast Link Down status / period. energy-detect-power-down Gets the current configured setting for Energy Detect Power Down (if supported). --get-tunable Get the tunable parameters. rx-copybreak Get the current rx copybreak value in bytes. tx-copybreak Get the current tx copybreak value in bytes. pfc-prevention-tout Get the current pfc prevention timeout value in msecs. --set-tunable Set driver's tunable parameters. rx-copybreak N Set the rx copybreak value in bytes. tx-copybreak N Set the tx copybreak value in bytes. pfc-prevention-tout N Set pfc prevention timeout in msecs. Value of 0 means disable and 65535 means au‐ to. --reset Reset hardware components specified by flags and components listed below flags N Resets the components based on direct flags mask mgmt Management processor irq Interrupt requester dma DMA engine filter Filtering/flow direction offload Protocol offload mac Media access controller phy Transceiver/PHY ram RAM shared between multiple components ap Application Processor dedicated All components dedicated to this interface all All components used by this interface, even if shared --show-fec Queries the specified network device for its support of Forward Error Correction. --set-fec Configures Forward Error Correction for the specified network device. Forward Error Correction modes selected by a user are expected to be persisted after any hotplug events. If a module is swapped that does not support the current FEC mode, the driver or firmware must take the link down administratively and report the problem in the system logs for users to correct. encoding auto|off|rs|baser|llrs [...] Sets the FEC encoding for the device. Combinations of options are specified as e.g. encoding auto rs ; the semantics of such combinations vary between drivers. auto Use the driver's default encoding off Turn off FEC RS Force RS-FEC encoding BaseR Force BaseR encoding LLRS Force LLRS-FEC encoding -Q|--per-queue Applies provided sub command to specific queues. queue_mask %x Sets the specific queues which the sub command is applied to. If queue_mask is not set, the sub command will be applied to all queues. sub_command Sub command to apply. The supported sub commands include --show-coalesce and --co‐ alesce. q.B --cable-test Perform a cable test and report the results. What results are returned depends on the capabilities of the network interface. Typically open pairs and shorted pairs can be reported, along with pairs being O.K. When a fault is detected the approximate dis‐ tance to the fault may be reported. --cable-test-tdr Perform a cable test and report the raw Time Domain Reflectometer data. A pulse is sent down a cable pair and the amplitude of the reflection, for a given distance, is reported. A break in the cable returns a big reflection. Minor damage to the cable re‐ turns a small reflection. If the cable is shorted, the amplitude of the reflection can be negative. By default, data is returned for lengths between 0 and 150m at 1m steps, for all pairs. However parameters can be passed to restrict the collection of data. It should be noted, that the interface will round the distances to whatever granularity is actually implemented. This is often 0.8 of a meter. The results should include the actual rounded first and last distance and step size. first N Distance along the cable, in meters, where the first measurement should be made. last N Distance along the cable, in meters, where the last measurement should be made. step N Distance, in meters, between each measurement. pair N Which pair should be measured. Typically a cable has 4 pairs. 0 = Pair A, 1 = Pair B, ... --monitor Listens to netlink notification and displays them. command If argument matching a command is used, ethtool only shows notifications of this type. Without such argument or with --all, all notification types are shown. devname If a device name is used as argument, only notification for this device are shown. Default is to show notifications for all devices. --show-tunnels Show tunnel-related device capabilities and state. List UDP ports kernel has pro‐ grammed the device to parse as VxLAN, or GENEVE tunnels. BUGS Not supported (in part or whole) on all network drivers. AUTHOR ethtool was written by David Miller. Modifications by Jeff Garzik, Tim Hockin, Jakub Jelinek, Andre Majorel, Eli Kupermann, Scott Feldman, Andi Kleen, Alexander Duyck, Sucheta Chakraborty, Jesse Brandeburg, Ben Hutchings, Scott Branden. AVAILABILITY ethtool is available from ⟨http://www.kernel.org/pub/software/network/ethtool/⟩ Ethtool version 5.16 January 2022 ETHTOOL(8)
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