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 [--disable-netlink] args
ethtool [--json] args
ethtool [-I | --include-statistics] args
ethtool [--phy N] 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 [index N qualifier
precise|approx]
ethtool --get-hwtimestamp-cfg devname
ethtool --set-hwtimestamp-cfg devname [index N qualifier precise|approx]
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]
[c33-pse-admin-control enable|disable] [c33-pse-avail-pw-limit N]
ethtool --flash-module-firmware devname file FILE [pass PASS]
ethtool --show-phys devname
DESCRIPTION
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 oper-
ate.
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
0x02 Summary of netlink messages
0x04 Hex dump of sent netlink messages
0x08 Hex dump of received netlink messages
0x10 Structure of netlink messages
--disable-netlink
Do not use netlink and fall back to the ioctl interface if possi-
ble.
--json Output results in JavaScript Object Notation (JSON). Only a sub-
set 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 al-
lows displaying relevant device statistics for selected get com-
mands.
--phy N
Target a PHY within the interface. The PHY index can be retrieved
with --show-phys. PHY index 0 targets the phy device directly at-
tached to the ethernet MAC, if any. The following commands can
accept a PHY index:
--cable-test
--cable-test-tdr
--get-plca-cfg
--set-plca-cfg
--get-plca-status
--show-pse
--set-pse
-a --show-pause
Queries the specified Ethernet device for pause parameter infor-
mation.
--src aggregate|emac|pmac
If the MAC Merge layer is supported, request a particular
source of device statistics (eMAC or pMAC, or their aggre-
gate). Only valid if ethtool was invoked with the -I --in-
clude-statistics argument.
-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 in-
formation.
-G --set-ring
Changes the rx/tx ring parameters of the specified network de-
vice.
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 infor-
mation.
-d --register-dump
Retrieves and prints a register dump for the specified network
device. The register format for some devices is known and decod-
ed 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 de-
vice. 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 specified net-
work 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
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 protocol
offload and other features.
-K --features --offload
Changes the offload parameters and other features of the speci-
fied 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 en-
abled
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 en-
abled
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 specific network port.
[ N] Length of time to perform phys-id, in seconds.
-P --show-permaddr
Queries the specified network device for permanent hardware ad-
dress.
-r --negotiate
Restarts auto-negotiation on the specified Ethernet device, 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 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.
--src aggregate|emac|pmac
If the MAC Merge layer is supported, request a particular
source of device statistics (eMAC or pMAC, or their aggre-
gate).
--phy-statistics
Queries the specified network device for PHY specific statistics.
-t --test
Executes adapter selftest on the specified network device. Possi-
ble test modes are:
offline
Perform full set of tests, possibly interrupting normal oper-
ation during the tests,
online Perform limited set of tests, not interrupting normal opera-
tion,
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 de-
vice. 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 con-
figured 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 de-
vices 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 au-
tomatic detection feature of most adapters. An argument of
auto means automatic detection of MDI status, 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. Autone-
gotiation 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 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
0x40000000000000000000000000 10baseT1BRR 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
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 exter-
nal 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 option
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 between dri-
vers.
-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 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 specified immediately after the value using the m
keyword, or separately using the field name keyword with -mask ap-
pended, 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 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 op-
tional 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 incom-
ing 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 (ap-
plicable 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 in-
coming 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 ac-
tion.
-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 re-
turned by ethtool -X ... context new. If combined with ac-
tion or queue, the Rx queue specified will be added to the
value read from the RSS indirection table to produce the ac-
tual Rx queue to deliver to.
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 over-
write 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 de-
vice. By default, it prints out the dump flag, version and
length of the dump data. When data is indicated, 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. Show the capabilities of the currently selected
time stamping if no index and qualifier is provided.
index N
Index of the ptp hardware clock
qualifier precise|approx
Qualifier of the ptp hardware clock. Mainly "precise" the de-
fault one is for IEEE 1588 quality and "approx" is for NICs
DMA point.
--get-hwtimestamp-cfg
Show the selected time stamping PTP hardware clock configuration.
--set-hwtimestamp-cfg
Select the device's time stamping PTP hardware clock.
index N
Index of the ptp hardware clock
qualifier precise|approx
Qualifier of the ptp hardware clock. Mainly "precise" the de-
fault one is for IEEE 1588 quality and "approx" is for NICs
DMA point.
-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 device. List
of RSS hash functions which kernel supports is shown as a
part of the --show-rxfh command output.
xfrm Sets the RSS input transformation. Currently, only the sym-
metric-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 ) before 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 desti-
nation 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 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 con-
junction 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 installed 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 re-
gions of non-volatile memory, this parameter may be used to
specify which region is to be written. The default is 0, re-
questing 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 trig-
ger 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 bound-
aries.
--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 ca-
pabilities. 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 supported). This will put the RX and TX circuit
blocks into a low power mode, and the PHY will wake up peri-
odically 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
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 possible. 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 components list-
ed 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 Proces-
sor
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 de-
vice.
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 op-
tions 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 --coalesce.
--cable-test
Perform a cable test and report the results. What results are re-
turned depends on the capabilities of the network interface. Typ-
ically 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 ca-
ble 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 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 measure-
ment should be made.
last N
Distance along the cable, in meters, where the last measure-
ment 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 programmed the device to parse as VxLAN, or GEN-
EVE 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 ad-
ministratively 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 configured 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 exactly 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 (aPLCALocalNodeID).
node-cnt N
The node-cnt [1 .. 255] should be set after the maximum num-
ber of nodes that can be plugged to the multi-drop network.
This parameter regulates the minimum length of the PLCA cy-
cle. Therefore, it is only meaningful 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 oppor-
tunity timer in bit-times, and shall be set equal across all
the nodes sharing the same medium for PLCA to work. The de-
fault 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
(aPLCATransmitOpportunityTimer).
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, mean-
ing 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 parameter
maps to IEEE 802.3cg-2019 clause 30.16.1.1.6 (aPLCAMaxBurst-
Count).
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 in-
tended.
--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 op-
erating in plain CSMA/CD mode.
--show-mm
Show the MAC Merge layer state. The ethtool argument -I --in-
clude-statistics can be used with this command, and MAC Merge
layer statistics counters will also be retrieved.
pmac-enabled
Shows whether the pMAC is enabled and capable of receiving
traffic and SMD-V frames (and responding to them with SMD-R
replies).
tx-enabled
Shows whether transmission on the pMAC is administratively
enabled.
tx-active
Shows whether transmission on the pMAC is active (verifica-
tion 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. Corre-
sponds to the standard addFragSize variable using the formu-
la:
tx-min-frag-size = 64 * (1 + addFragSize) - 4
rx-min-frag-size
Shows the minimum size (in octets) of non-final fragments
which the local device supports receiving.
verify-enabled
Shows whether the verification state machine is enabled. This
process, if successful, ensures that preemptible 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 attempts, rep-
resented as an integer between 1 and 128 ms. The standard de-
fines a fixed number of verification attempts (verifyLimit)
before failing the verification 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 machine of
the local device. Values can be INITIAL, VERIFYING, SUCCEED-
ED, 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 (aPoDLPSEPowerDetectionStatus) with
potential values being disabled, searching, delivering power,
sleep, idle, error
c33-pse-admin-state
This attribute indicates the operational status of c33 PSE
functions, which can be modified using the c33-pse-admin-con-
trol parameter. It corresponds to IEEE 802.3-2022 30.9.1.1.2
(aPSEAdminState), with potential values being enabled, dis-
abled
c33-pse-power-detection-status
This attribute indicates the power detection status of the
c33 PSE. The status depend on internal PSE state machine and
automatic PD classification support. It corresponds to IEEE
802.3-2022 30.9.1.1.5 (aPSEPowerDetectionStatus) with poten-
tial values being disabled, searching, delivering power,
test, fault, other fault
c33-pse-extended-state
This attribute indicates the Extended state of the c33 PSE.
The extended state correlated with the c33 PSE Extended Sub-
state allows to have more detail on the c33 PSE current error
state. It corresponds to IEEE 802.3-2022 33.2.4.4 Variables.
c33-pse-extended-substate
This attribute indicates the Extended substate of the c33
PSE. Correlated with the c33 PSE Extended state value, it al-
lows to have more detail on the c33 PSE current error state.
c33-pse-power-class
This attribute identifies the power class of the c33 PSE. It
depends on the class negotiated between the PSE and the PD.
It corresponds to IEEE 802.3-2022 30.9.1.1.8 (aPSEPowerClas-
sification).
c33-pse-actual-power
This attribute identifies the actual power drawn by the c33
PSE. It corresponds to ``IEEE 802.3-2022`` 30.9.1.1.23
(aPSEActualPower). Actual power is reported in mW.
c33-pse-available-power-limit
This attribute identifies the configured c33 PSE power limit
in mW.
c33-pse-power-limit-ranges
This attribute specifies the allowed power limit ranges in mW
for configuring the c33-pse-avail-pw-limit parameter. It de-
fines the valid power levels that can be assigned to the c33
PSE in compliance with the c33 standard.
--set-pse
Set Power Sourcing Equipment (PSE) parameters.
podl-pse-admin-control enable|disable
This parameter manages PoDL PSE Admin operations in accor-
dance with the IEEE 802.3-2018 30.15.1.2.1 (acPoDLPSEAdmin-
Control) specification.
c33-pse-admin-control enable|disable
This parameter manages c33 PSE Admin operations in accordance
with the IEEE 802.3-2022 30.9.1.2.1 (acPSEAdminControl) spec-
ification.
c33-pse-avail-pw-limit N
This parameter manages c33 PSE Available Power Limit in mW,
in accordance with the IEEE 802.3-2022 33.2.4.4 Variables
(pse_available_power) specification.
--flash-module-firmware
Flash the transceiver module's firmware. The firmware update
process is composed from three logical steps. Downloading a
firmware image to the transceiver module, running the image and
committing the image so that it is run upon reset. When flash
command is given, the firmware update process is performed in its
entirety in that order.
file FILE
Specifies the filename of the transceiver module firmware im-
age. The firmware must first be installed in one of the di-
rectories where the kernel firmware loader or firmware agent
will look, such as /lib/firmware. The firmware image is down-
loaded to the transceiver module, validated, run and commit-
ted.
pass PASS
Optional transceiver module password that might be required
as part of the transceiver module firmware update process.
--show-phys
Show the PHY devices attached to an interface, and the way they
link together.
phy_index
The PHY's index, that identifies it within the network inter-
face. If the interface has multiple PHYs, they will each have
a unique index on that interface. This index can then be used
for commands that targets PHYs.
drvname
The name of the driver bound to this PHY device.
name The PHY's device name, matching the name found in sysfs.
downstream_sfp_name
If the PHY drives an SFP cage, this field contains the name
of the associated SFP bus.
upstream_type mac | phy
Indicates the nature of the device the PHY is attached to.
upstream_index
If the PHY's upstream_type is phy , this field indicates the
phy_index of the upstream phy.
upstream_sfp_name
If the PHY is withing an SFP/SFF module, this field contains
the name of the upstream SFP bus.
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 ]8;;http://www.kernel.org/pub/software/network/ethtool/\http://www.kernel.org/pub/software/net-
work/ethtool/]8;;\
Ethtool version 6.14.2 July 2025 ETHTOOL(8)
Generated by dwww version 1.16 on Tue Dec 16 04:43:41 CET 2025.