ethtool(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | AUTHOR | AVAILABILITY | COLOPHON

ETHTOOL(8)               System Manager's Manual              ETHTOOL(8)

NAME         top

       ethtool - query or control network driver and hardware settings

SYNOPSIS         top


       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]
              [tx-aggr-max-bytes N] [tx-aggr-max-frames N]
              [tx-aggr-time-usecs N]

       ethtool -g|--show-ring devname

       ethtool -G|--set-ring devname [rx N] [rx-mini N] [rx-jumbo N]
              [tx N] [rx-buf-len N] [tcp-data-split auto|on|off]
              [cqe-size N] [tx-push N] [rx-push N] [tx-push-buf-len 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] [rmon] ]

       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] [xfrm symmetric-
              xor|none] [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] [tx-
              buf-size] [pfc-prevention-tout]

       ethtool --set-tunable devname [rx-copybreak N] [tx-copybreak N]
              [tx-buf-size 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

       ethtool --show-module devname

       ethtool --set-module devname [power-mode-policy high|auto]

       ethtool --get-plca-cfg devname

       ethtool --set-plca-cfg devname [enable on|off] [node-id N]
              [node-cnt N] [to-tmr N] [burst-cnt N] [burst-tmr N]

       ethtool --get-plca-status devname

       ethtool --show-mm devname

       ethtool --set-mm devname [verify-enabled on|off] [verify-time N]
              [tx-enabled on|off] [pmac-enabled on|off]
              [tx-min-frag-size N]

       ethtool --show-pse devname

       ethtool --set-pse devname [podl-pse-admin-control enable|disable]

DESCRIPTION         top

       ethtool  is  used  to query and control network device driver and
       hardware settings, particularly for wired Ethernet devices.

       devname is the name of the network device on which ethtool should
       operate.

OPTIONS         top

       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
              0x02  Summary of netlink messages
              0x04  Hex dump of sent netlink messages
              0x08  Hex dump of received netlink messages
              0x10  Structure of netlink messages

       --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 op‐
              tion.

       -I --include-statistics
              Include command-related statistics in the output. This op‐
              tion allows displaying relevant device statistics for se‐
              lected get commands.

       -a --show-pause
              Queries the specified Ethernet device for pause parameter
              information.

           --src aggregate|emac|pmac
                  If the MAC Merge layer is supported, request a partic‐
                  ular source of device statistics (eMAC or pMAC, or
                  their aggregate). Only valid if ethtool was invoked
                  with the -I --include-statistics argument.

       -A --pause
              Changes the pause parameters of the specified Ethernet de‐
              vice.

           autoneg on|off
                  Specifies whether pause autonegotiation should be en‐
                  abled.

           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 infor‐
              mation.

       -C --coalesce
              Changes the coalescing settings of the specified network
              device.

       -g --show-ring
              Queries the specified network device for rx/tx ring para‐
              meter 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.

           rx-buf-len N
                  Changes the size of a buffer in the Rx ring.

           tcp-data-split auto|on|off
                  Specifies the state of TCP data split.

           cqe-size N
                  Changes the size of completion queue event.

           tx-push on|off
                  Specifies whether TX push should be enabled.

           rx-push on|off
                  Specifies whether RX push should be enabled.

           tx-push-buf-len N
                  Specifies the maximum number of bytes of a transmitted
                  packet a driver can push directly to the underlying
                  device

       -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 std‐
              out.  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 net‐
              work device.  When raw is enabled, 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 speci‐
              fied 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 pa‐
              rameters allow writing to certain portions of the EEPROM.
              Because of the persistent nature of writing to the EEPROM,
              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 pro‐
              tocol offload and other features.

       -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 en‐
                  abled

           rxvlan on|off
                  Specifies whether RX VLAN acceleration should be en‐
                  abled

           txvlan on|off
                  Specifies whether TX VLAN acceleration should be en‐
                  abled

           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.  Typi‐
              cally 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 hard‐
              ware address.

       -r --negotiate
              Restarts auto-negotiation on the specified Ethernet de‐
              vice, if auto-negotiation is enabled.

       -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 statis‐
              tics 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.

           --src aggregate|emac|pmac
                  If the MAC Merge layer is supported, request a partic‐
                  ular source of device statistics (eMAC or pMAC, or
                  their aggregate).

       --phy-statistics
              Queries the specified network device for PHY specific sta‐
              tistics.

       -t --test
              Executes adapter selftest on the specified network device.
              Possible test modes are:

           offline
                  Perform full set of tests, possibly interrupting nor‐
                  mal 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 addi‐
                  tionally an external-loopback test.

       -s --change
              Allows changing some or all settings of the specified net‐
              work 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-mas‐
           ter|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
                  configured as SLAVE, the PMA Transmit function shall
                  source TX_TCLK from the clock recovered 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 feature 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 guar‐
                  antee 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 autonegotia‐
                  tion.  The argument is a hexadecimal value using one
                  or a combination of the following values:
                  0x001                          10baseT Half
                  0x002                          10baseT Full
                  0x100000000000000000000000     10baseT1L Full
                  0x8000000000000000000000000    10baseT1S Full
                  0x10000000000000000000000000   10baseT1S Half
                  0x20000000000000000000000000   10baseT1S_P2MP Half
                  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
                  0x200000000000000000000000     800000baseCR8 Full
                  0x400000000000000000000000     800000baseKR8 Full
                  0x800000000000000000000000     800000baseDR8 Full
                  0x1000000000000000000000000    800000baseDR8_2 Full
                  0x2000000000000000000000000    800000baseSR8 Full
                  0x4000000000000000000000000    800000baseVR8 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 option 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 op‐
                  tion must be 6 bytes in Ethernet 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 message 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 be‐
                  tween 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|sctp6
           m|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 spec‐
                  ified 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 spec‐
           ified, the mask may be specified immediately after the value
           using the m keyword, or separately using the field name key‐
           word 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 op‐
                  tional 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 separated 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 only 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 optional 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 (ap‐
                  plicable 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 equiv‐
                  alents.

           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 separated 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 mul‐
                  tiple 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 compat‐
                  ible 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 net‐
              work device.  By default, it prints out the dump flag,
              version and length of the dump data.  When data is indi‐
              cated, 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 associat‐
              ed 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 device supported length.  Hash
                  key format must be in xx:yy:zz:aa:bb:cc format meaning
                  both the nibbles of a byte should be mentioned even if
                  a nibble is zero.

           hfunc  Sets RSS hash function of the specified network de‐
                  vice.  List of RSS hash functions which kernel sup‐
                  ports is shown as a part of the --show-rxfh command
                  output.

           xfrm   Sets the RSS input transformation. Currently, only the
                  symmetric-xor transformation is supported where the
                  NIC XORs the L3 and/or L4 source and destination
                  fields (as selected by --config-nfc rx-flow-hash ) be‐
                  fore passing them to the hash algorithm. The RSS hash
                  function will then yield the same hash for the other
                  flow direction where the source and destination fields
                  are swapped (i.e. Symmetric RSS). Note that XORing the
                  input parameters reduces the entropy of the input set
                  and the hash algorithm could potentially be exploited.
                  Switch off (default) by xfrm none.

           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 al‐
                  locate 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 mem‐
              ory on the device.

           file   Specifies the filename of the firmware image.  The
                  firmware must first be installed in one of the direc‐
                  tories where the kernel firmware loader or firmware
                  agent will look, such as /lib/firmware.

           N      If the device stores multiple firmware images in sepa‐
                  rate 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 driver-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 (according 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 adver‐
                  tise

           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 supported).  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 also enable the periodic transmission of TX puls‐
                  es.
                  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 incom‐
                  patible with 1000BASE-T, PHY device provides an auto‐
                  matic 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.

           tx-buf-size
                  Get the current tx copybreak buffer size 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.

           tx-buf-size N
                  Set the tx copybreak buffer size in bytes.

           pfc-prevention-tout N
                  Set pfc prevention timeout in msecs. Value of 0 means
                  disable and 65535 means auto.

       --reset
              Reset hardware components specified by flags and compo‐
              nents 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 net‐
              work device.

              Forward Error Correction modes selected by a user are ex‐
              pected to be persisted after any hotplug events. If a mod‐
              ule is swapped that does not support the current FEC mode,
              the driver or firmware must take the link down administra‐
              tively 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 ap‐
                  plied 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 in‐
                  clude --show-coalesce and --coalesce.

       --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 de‐
              tected the approximate distance to the fault may be re‐
              ported.

       --cable-test-tdr
              Perform a cable test and report the raw Time Domain Re‐
              flectometer 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 returns a small reflection. If
              the cable is shorted, the amplitude of the reflection can
              be negative. By default, data is returned for lengths be‐
              tween 0 and 150m at 1m steps, for all pairs. However para‐
              meters can be passed to restrict the collection of data.
              It should be noted, that the interface will round the dis‐
              tances 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 argu‐
                  ment or with --all, all notification types are shown.

           devname
                  If a device name is used as argument, only notifica‐
                  tion for this device are shown. Default is to show no‐
                  tifications for all devices.

       --show-tunnels
              Show tunnel-related device capabilities and state.  List
              UDP ports kernel has programmed the device to parse as
              VxLAN, or GENEVE tunnels.

       --show-module
              Show the transceiver module's parameters.

       --set-module
              Set the transceiver module's parameters.

           power-mode-policy high|auto
                  Set the power mode policy for the module. When set to
                  high, the module always operates at high power mode.
                  When set to auto, the module is transitioned by the
                  host to high power mode when the first port using it
                  is put administratively up and to low power mode when
                  the last port using it is put administratively down.
                  The power mode policy can be set before a module is
                  plugged-in.

       --get-plca-cfg
              Show the current PLCA parameters for the given interface.

       --set-plca-cfg
              Change the PLCA settings for the given interface.

           enable on|off
                  Enables or disables the PLCA function. When the PLCA
                  RS is disabled (default), the PHY operates in plain
                  CSMA/CD mode. To enable PLCA, the PHY must be assigned
                  a unique plca-id other than 255. This one can be con‐
                  figured concurrently with the enable parameter. The
                  enable parameter maps to IEEE 802.3cg-2019 clause
                  30.16.1.1.1 (aPLCAAdminState) and clause 30.16.1.2.1
                  (acPLCAAdminControl).

           node-id N
                  The unique node identifier in the range [0 .. 255].
                  Node ID 0 is reserved for the coordinator node, the
                  one generating the BEACON signal. There must be exact‐
                  ly one coordinator on a PLCA network. Setting the node
                  ID to 255 (default) disables the node. This parameter
                  maps to IEEE 802.3cg-2019 clause 30.16.1.1.4 (aPLCALo‐
                  calNodeID).

           node-cnt N
                  The node-cnt [1 .. 255] should be set after the maxi‐
                  mum number of nodes that can be plugged to the multi-
                  drop network. This parameter regulates the minimum
                  length of the PLCA cycle. Therefore, it is only mean‐
                  ingful for the coordinator node (nod-id = 0). Setting
                  this parameter on a follower node has no effect. The
                  node-cnt parameter maps to IEEE 802.3cg-2019 clause
                  30.16.1.1.3 (aPLCANodeCount).

           to-tmr N
                  The TO timer parameter sets the value of the transmit
                  opportunity timer in bit-times, and shall be set equal
                  across all the nodes sharing the same medium for PLCA
                  to work. The default value of 32 is enough to cover a
                  link of roughly 50 mt. This parameter maps to  IEEE
                  802.3cg-2019 clause 30.16.1.1.5 (aPLCATransmitOpportu‐
                  nityTimer).

           burst-cnt N
                  The burst-cnt parameter [0 .. 255] indicates the extra
                  number of packets that the node is allowed to send
                  during a single transmit opportunity.  By default,
                  this attribute is 0, meaning that the node can send a
                  sigle frame per TO. When greater than 0, the PLCA RS
                  keeps the TO after any transmission, waiting for the
                  MAC to send a new frame for up to burst-tmr BTs. This
                  can only happen a number of times per PLCA cycle up to
                  the value of this parameter.  After that, the burst is
                  over and the normal counting of TOs resumes.  This pa‐
                  rameter maps to IEEE 802.3cg-2019 clause 30.16.1.1.6
                  (aPLCAMaxBurstCount).

           burst-tmr N
                  The burst-tmr parameter [0 .. 255] sets how many bit-
                  times the PLCA RS waits for the MAC to initiate a new
                  transmission when burst-cnt is greater than 0. If the
                  MAC fails to send a new frame within this time, the
                  burst ends and the counting of TOs resumes. Otherwise,
                  the new frame is sent as part of the current burst.
                  This parameter maps to IEEE 802.3cg-2019 clause
                  30.16.1.1.7 (aPLCABurstTimer). The value of burst-tmr
                  should be set greater than the Inter-Frame-Gap (IFG)
                  time of the MAC (plus some margin) for PLCA burst mode
                  to work as intended.

       --get-plca-status
              Show the current PLCA status for the given interface. If
              on, the PHY is successfully receiving or generating the
              BEACON signal. If off, the PLCA function is temporarily
              disabled and the PHY is operating in plain CSMA/CD mode.

       --show-mm
              Show the MAC Merge layer state. The ethtool argument -I
              --include-statistics can be used with this command, and
              MAC Merge layer statistics counters will also be re‐
              trieved.

           pmac-enabled
                  Shows whether the pMAC is enabled and capable of re‐
                  ceiving traffic and SMD-V frames (and responding to
                  them with SMD-R replies).

           tx-enabled
                  Shows whether transmission on the pMAC is administra‐
                  tively enabled.

           tx-active
                  Shows whether transmission on the pMAC is active (ver‐
                  ification is either successful, or was disabled).

           tx-min-frag-size
                  Shows the minimum size (in octets) of transmitted non-
                  final fragments which can be received by the link
                  partner. Corresponds to the standard addFragSize vari‐
                  able using the formula:

                  tx-min-frag-size = 64 * (1 + addFragSize) - 4

           rx-min-frag-size
                  Shows the minimum size (in octets) of non-final frag‐
                  ments which the local device supports receiving.

           verify-enabled
                  Shows whether the verification state machine is en‐
                  abled. This process, if successful, ensures that pre‐
                  emptible frames transmitted by the local device will
                  not be dropped as error frames by the link partner.

           verify-time
                  Shows the interval in ms between verification at‐
                  tempts, represented as an integer between 1 and 128
                  ms. The standard defines a fixed number of verifica‐
                  tion attempts (verifyLimit) before failing the verifi‐
                  cation process.

           max-verify-time
                  Shows the maximum value for verify-time accepted by
                  the local device, which may be less than 128 ms.

           verify-status
                  Shows the current state of the verification state ma‐
                  chine of the local device.  Values can be INITIAL,
                  VERIFYING, SUCCEEDED, FAILED or DISABLED.

       --set-mm
              Set the MAC Merge layer parameters.

           pmac-enabled  on|off
                  Enable reception for the pMAC.

           tx-enabled  on|off
                  Administatively enable transmission for the pMAC.

           tx-min-frag-size  N
                  Set the minimum size (in octets) of transmitted non-
                  final fragments which can be received by the link
                  partner.

           verify-enabled  on|off
                  Enable or disable the verification state machine.

           verify-time  N
                  Set the interval in ms between verification attempts.

       --show-pse
              Show the current Power Sourcing Equipment (PSE) status for
              the given interface.

           podl-pse-admin-state
                  This attribute indicates the operational status of
                  PoDL PSE functions, which can be modified using the
                  podl-pse-admin-control parameter. It corresponds to
                  IEEE 802.3-2018 30.15.1.1.2 (aPoDLPSEAdminState), with
                  potential values being enabled, disabled

           podl-pse-power-detection-status
                  This attribute indicates the power detection status of
                  the PoDL PSE. The status depend on internal PSE state
                  machine and automatic PD classification support. It
                  corresponds to IEEE 802.3-2018 30.15.1.1.3 (aPoDLPSE‐
                  PowerDetectionStatus) with potential values being dis‐
                  abled, searching, delivering power, sleep, idle, error

       --set-pse
              Set Power Sourcing Equipment (PSE) parameters.

           podl-pse-admin-control  enable|disable
                  This parameter manages PoDL PSE Admin operations in
                  accordance with the IEEE 802.3-2018 30.15.1.2.1
                  (acPoDLPSEAdminControl) specification.

BUGS         top

       Not supported (in part or whole) on all network drivers.

AUTHOR         top

       ethtool was written by David Miller.

       Modifications by Jeff Garzik, Tim Hockin, Jakub Jelinek, Andre
       Majorel, Eli Kupermann, Scott Feldman, Andi Kleen, Alexander Duy‐
       ck, Sucheta Chakraborty, Jesse Brandeburg, Ben Hutchings, Scott
       Branden.

AVAILABILITY         top

       ethtool is available from 
       ⟨http://www.kernel.org/pub/software/network/ethtool/

COLOPHON         top

       This page is part of the ethtool (utility for controlling network
       drivers and hardware) project.  Information about the project can
       be found at 
       ⟨https://www.kernel.org/pub/software/network/ethtool/⟩.  If you
       have a bug report for this manual page, send it to
       [email protected], [email protected].  This page was obtained
       from the project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/network/ethtool/ethtool.git⟩ on
       2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-05-23.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to [email protected]

Ethtool version 6.9             May 2024                      ETHTOOL(8)

Pages that refer to this page: veth(4)ip-link(8)ovs-l3ping(8)ovs-test(8)ovs-vlan-test(8)tc-mqprio(8)