ETHTOOL(8) - phpMan

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

NAME
ethtool - query or control network driver and hardware settings

SYNOPSIS
ethtool devname

ethtool -h|--help

ethtool --version

ethtool [--debug N] args

ethtool [--json] args

ethtool [-I | --include-statistics] args

ethtool --monitor [ command ] [ devname ]

ethtool -a|--show-pause devname

ethtool -A|--pause devname [autoneg on|off] [rx on|off] [tx on|off]

ethtool -c|--show-coalesce devname

ethtool -C|--coalesce devname [adaptive-rx on|off] [adaptive-tx on|off] [rx-usecs N]
[rx-frames N] [rx-usecs-irq N] [rx-frames-irq N] [tx-usecs N] [tx-frames N]
[tx-usecs-irq N] [tx-frames-irq N] [stats-block-usecs N] [pkt-rate-low N]
[rx-usecs-low N] [rx-frames-low N] [tx-usecs-low N] [tx-frames-low N]
[pkt-rate-high N] [rx-usecs-high N] [rx-frames-high N] [tx-usecs-high N]
[tx-frames-high N] [sample-interval N] [cqe-mode-rx on|off] [cqe-mode-tx on|off]

ethtool -g|--show-ring devname

ethtool -G|--set-ring devname [rx N] [rx-mini N] [rx-jumbo N] [tx N]

ethtool -i|--driver devname

ethtool -d|--register-dump devname [raw on|off] [hex on|off] [file name]

ethtool -e|--eeprom-dump devname [raw on|off] [offset N] [length N]

ethtool -E|--change-eeprom devname [magic N] [offset N] [length N] [value N]

ethtool -k|--show-features|--show-offload devname

ethtool -K|--features|--offload devname feature on|off ...

ethtool -p|--identify devname [N]

ethtool -P|--show-permaddr devname

ethtool -r|--negotiate devname

ethtool -S|--statistics devname [--all-groups|--groups [eth-phy] [eth-mac] [eth-ctrl] ]

ethtool --phy-statistics devname

ethtool -t|--test devname [offline|online|external_lb]

ethtool -s devname [speed N] [lanes N] [duplex half|full] [port tp|aui|bnc|mii]
[mdix auto|on|off] [autoneg on|off] [advertise N[/M] | advertise mode on|off ...]
[phyad N] [xcvr internal|external] [wol N[/M] | wol p|u|m|b|a|g|s|f|d...]
[sopass xx:yy:zz:aa:bb:cc] [master-slave preferred-master|preferred-slave|forced-
master|forced-slave] [msglvl N[/M] | msglvl type on|off ...]

ethtool -n|-u|--show-nfc|--show-ntuple devname
[ rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 |
rule N ]

ethtool -N|-U|--config-nfc|--config-ntuple devname
rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 m|v|t|s|d|f|n|r... |
flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4|ip6|tcp6|udp6|ah6|esp6|sctp6
[src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]]
[dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [proto N [m N]] [src-ip ip-
address [m ip-address]] [dst-ip ip-address [m ip-address]] [tos N [m N]]
[tclass N [m N]] [l4proto N [m N]] [src-port N [m N]] [dst-port N [m N]]
[spi N [m N]] [l4data N [m N]] [vlan-etype N [m N]] [vlan N [m N]]
[user-def N [m N]] [dst-mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [action N]
[context N] [loc N] |
delete N

ethtool -w|--get-dump devname [data filename]

ethtool -W|--set-dump devname N

ethtool -T|--show-time-stamping devname

ethtool -x|--show-rxfh-indir|--show-rxfh devname

ethtool -f|--flash devname file [N]

ethtool -l|--show-channels devname

ethtool -L|--set-channels devname [rx N] [tx N] [other N] [combined N]

ethtool -m|--dump-module-eeprom|--module-info devname [raw on|off] [hex on|off] [offset N]
[length N] [page N] [bank N] [i2c N]

ethtool --show-priv-flags devname

ethtool --set-priv-flags devname flag on|off ...

ethtool --show-eee devname

ethtool --set-eee devname [eee on|off] [tx-lpi on|off] [tx-timer N] [advertise N]

ethtool --set-phy-tunable devname [ downshift on|off [count N] ] [ fast-link-down on|off
[msecs N] ] [ energy-detect-power-down on|off [msecs N] ]

ethtool --get-phy-tunable devname [downshift] [fast-link-down] [energy-detect-power-down]

ethtool --get-tunable devname [rx-copybreak] [tx-copybreak] [pfc-prevention-tout]

ethtool --set-tunable devname [rx-copybreak N] [tx-copybreak N] [pfc-prevention-tout N]

ethtool --reset devname [flags N] [mgmt] [mgmt-shared] [irq] [irq-shared] [dma] [dma-
shared] [filter] [filter-shared] [offload] [offload-shared] [mac] [mac-shared]
[phy] [phy-shared] [ram] [ram-shared] [ap] [ap-shared] [dedicated] [all]

ethtool --show-fec devname

ethtool --set-fec devname encoding auto|off|rs|baser|llrs [...]

ethtool -Q|--per-queue devname [queue_mask %x] sub_command ...
.

ethtool --cable-test devname

ethtool --cable-test-tdr devname [first N] [last N] [step N] [pair N]

ethtool --show-tunnels devname

DESCRIPTION
ethtool is used to query and control network device driver and hardware settings, particu-
larly for wired Ethernet devices.

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

OPTIONS
ethtool with a single argument specifying the device name prints current settings of the
specified device.

-h --help
Shows a short help message.

--version
Shows the ethtool version number.

--debug N
Turns on debugging messages. Argument is interpreted as a mask:

0x01 Parser information

--json Output results in JavaScript Object Notation (JSON). Only a subset of options sup-
port this. Those which do not will continue to output plain text in the presence of
this option.

-I --include-statistics
Include command-related statistics in the output. This option allows displaying
relevant device statistics for selected get commands.

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

-A --pause
Changes the pause parameters of the specified Ethernet device.

autoneg on|off
Specifies whether pause autonegotiation should be enabled.

rx on|off
Specifies whether RX pause should be enabled.

tx on|off
Specifies whether TX pause should be enabled.

-c --show-coalesce
Queries the specified network device for coalescing information.

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

-g --show-ring
Queries the specified network device for rx/tx ring parameter information.

-G --set-ring
Changes the rx/tx ring parameters of the specified network device.

rx N Changes the number of ring entries for the Rx ring.

rx-mini N
Changes the number of ring entries for the Rx Mini ring.

rx-jumbo N
Changes the number of ring entries for the Rx Jumbo ring.

tx N Changes the number of ring entries for the Tx ring.

-i --driver
Queries the specified network device for associated driver information.

-d --register-dump
Retrieves and prints a register dump for the specified network device. The regis-
ter format for some devices is known and decoded others are printed in hex. When
raw is enabled, then ethtool dumps the raw register data to stdout. If file is
specified, then use contents of previous raw register dump, rather than reading
from the device.

-e --eeprom-dump
Retrieves and prints an EEPROM dump for the specified network device. When raw is
enabled, then it dumps the raw EEPROM data to stdout. The length and offset parame-
ters allow dumping certain portions of the EEPROM. Default is to dump the entire
EEPROM.

raw on|off

offset N

length N

-E --change-eeprom
If value is specified, changes EEPROM byte for the specified network device. off-
set 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 specified network device.
The following feature names are built-in and others may be defined by the kernel.

rx on|off
Specifies whether RX checksumming should be enabled.

tx on|off
Specifies whether TX checksumming should be enabled.

sg on|off
Specifies whether scatter-gather should be enabled.

tso on|off
Specifies whether TCP segmentation offload should be enabled.

ufo on|off
Specifies whether UDP fragmentation offload should be enabled

gso on|off
Specifies whether generic segmentation offload should be enabled

gro on|off
Specifies whether generic receive offload should be enabled

lro on|off
Specifies whether large receive offload should be enabled

rxvlan on|off
Specifies whether RX VLAN acceleration should be enabled

txvlan on|off
Specifies whether TX VLAN acceleration should be enabled

ntuple on|off
Specifies whether Rx ntuple filters and actions should be enabled

rxhash on|off
Specifies whether receive hashing offload should be enabled

-p --identify
Initiates adapter-specific action intended to enable an operator to easily identify
the adapter by sight. Typically this involves blinking one or more LEDs on the
specific network port.

[ N] Length of time to perform phys-id, in seconds.

-P --show-permaddr
Queries the specified network device for permanent hardware address.

-r --negotiate
Restarts auto-negotiation on the specified Ethernet device, if auto-negotiation is
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, de-
vices may implement either, both or none. There is little commonality between nam-
ing of NIC- and driver-specific statistics across vendors.

--all-groups

--groups [eth-phy] [eth-mac] [eth-ctrl] [rmon]
Request groups of standard device statistics.

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

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

offline
Perform full set of tests, possibly interrupting normal operation during the
tests,

online Perform limited set of tests, not interrupting normal operation,

external_lb
Perform full set of tests, as for offline, and additionally an external-loop-
back test.

-s --change
Allows changing some or all settings of the specified network device. All follow-
ing options only apply if -s was specified.

speed N
Set speed in Mb/s. ethtool with just the device name as an argument will show
you the supported device speeds.

lanes N
Set number of lanes.

duplex half|full
Sets full or half duplex mode.

port tp|aui|bnc|mii
Selects device port.

master-slave preferred-master|preferred-slave|forced-master|forced-slave
Configure MASTER/SLAVE role of the PHY. When the PHY is configured as MASTER,
the PMA Transmit function shall source TX_TCLK from a local clock source. When
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
status, on forces MDI-X (crossover) mode, while off means MDI (straight
through) mode. The driver should guarantee that this command takes effect im-
mediately, and if necessary may reset the link to cause the change to take ef-
fect.

autoneg on|off
Specifies whether autonegotiation should be enabled. Autonegotiation is enabled
by default, but in some network devices may have trouble with it, so you can
disable it if really necessary.

advertise N
Sets the speed and duplex advertised by autonegotiation. The argument is a
hexadecimal value using one or a combination of the following values:

0x001 10baseT Half
0x002 10baseT Full
0x004 100baseT Half
0x008 100baseT Full
0x80000000000000000 100baseT1 Full
0x40000000000000000000000 100baseFX Half
0x80000000000000000000000 100baseFX Full
0x010 1000baseT Half (not supported by IEEE standards)
0x020 1000baseT Full
0x20000 1000baseKX Full
0x20000000000 1000baseX Full
0x100000000000000000 1000baseT1 Full
0x8000 2500baseX Full (not supported by IEEE standards)
0x800000000000 2500baseT Full
0x1000000000000 5000baseT Full
0x1000 10000baseT Full
0x40000 10000baseKX4 Full
0x80000 10000baseKR Full
0x100000 10000baseR_FEC
0x40000000000 10000baseCR Full
0x80000000000 10000baseSR Full
0x100000000000 10000baseLR Full
0x200000000000 10000baseLRM Full
0x400000000000 10000baseER Full
0x200000 20000baseMLD2 Full (not supported by IEEE standards)
0x400000 20000baseKR2 Full (not supported by IEEE standards)
0x80000000 25000baseCR Full
0x100000000 25000baseKR Full
0x200000000 25000baseSR Full
0x800000 40000baseKR4 Full
0x1000000 40000baseCR4 Full
0x2000000 40000baseSR4 Full
0x4000000 40000baseLR4 Full
0x400000000 50000baseCR2 Full
0x800000000 50000baseKR2 Full
0x10000000000 50000baseSR2 Full
0x10000000000000 50000baseKR Full
0x20000000000000 50000baseSR Full
0x40000000000000 50000baseCR Full
0x80000000000000 50000baseLR_ER_FR Full
0x100000000000000 50000baseDR Full
0x8000000 56000baseKR4 Full
0x10000000 56000baseCR4 Full
0x20000000 56000baseSR4 Full
0x40000000 56000baseLR4 Full
0x1000000000 100000baseKR4 Full
0x2000000000 100000baseSR4 Full
0x4000000000 100000baseCR4 Full
0x8000000000 100000baseLR4_ER4 Full
0x200000000000000 100000baseKR2 Full
0x400000000000000 100000baseSR2 Full
0x800000000000000 100000baseCR2 Full
0x1000000000000000 100000baseLR2_ER2_FR2 Full
0x2000000000000000 100000baseDR2 Full
0x8000000000000000000 100000baseKR Full
0x10000000000000000000 100000baseSR Full
0x20000000000000000000 100000baseLR_ER_FR Full
0x40000000000000000000 100000baseCR Full
0x80000000000000000000 100000baseDR Full
0x4000000000000000 200000baseKR4 Full
0x8000000000000000 200000baseSR4 Full
0x10000000000000000 200000baseLR4_ER4_FR4 Full
0x20000000000000000 200000baseDR4 Full
0x40000000000000000 200000baseCR4 Full
0x100000000000000000000 200000baseKR2 Full
0x200000000000000000000 200000baseSR2 Full
0x400000000000000000000 200000baseLR2_ER2_FR2 Full
0x800000000000000000000 200000baseDR2 Full
0x1000000000000000000000 200000baseCR2 Full
0x200000000000000000 400000baseKR8 Full
0x400000000000000000 400000baseSR8 Full
0x800000000000000000 400000baseLR8_ER8_FR8 Full
0x1000000000000000000 400000baseDR8 Full
0x2000000000000000000 400000baseCR8 Full
0x2000000000000000000000 400000baseKR4 Full
0x4000000000000000000000 400000baseSR4 Full
0x8000000000000000000000 400000baseLR4_ER4_FR4 Full
0x10000000000000000000000 400000baseDR4 Full
0x20000000000000000000000 400000baseCR4 Full

phyad N
PHY address.

xcvr internal|external
Selects transceiver type. Currently only internal and external can be speci-
fied, 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 MagicPackettm
s Enable SecureOntm password for MagicPackettm
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 SecureOntm 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 de-
fined type names and numbers are:

drv 0x0001 General driver status
probe 0x0002 Hardware probing
link 0x0004 Link state
timer 0x0008 Periodic status check
ifdown 0x0010 Interface being brought down
ifup 0x0020 Interface being brought up
rx_err 0x0040 Receive error
tx_err 0x0080 Transmit error
tx_queued 0x0100 Transmit queueing
intr 0x0200 Interrupt handling
tx_done 0x0400 Transmit completion
rx_status 0x0800 Receive completion
pktdata 0x1000 Packet contents
hw 0x2000 Hardware status
wol 0x4000 Wake-on-LAN status

The precise meanings of these type flags differ between drivers.

-n -u --show-nfc --show-ntuple
Retrieves receive network flow classification options or rules.

rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
Retrieves the hash options for the specified flow type.

tcp4 TCP over IPv4
udp4 UDP over IPv4
ah4 IPSEC AH over IPv4
esp4 IPSEC ESP over IPv4
sctp4 SCTP over IPv4
tcp6 TCP over IPv6
udp6 UDP over IPv6
ah6 IPSEC AH over IPv6
esp6 IPSEC ESP over IPv6
sctp6 SCTP over IPv6

rule N Retrieves the RX classification rule with the given ID.

-N -U --config-nfc --config-ntuple
Configures receive network flow classification options or rules.

rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6m|v|t|s|d|f|n|r...
Configures the hash options for the specified flow type.

m Hash on the Layer 2 destination address of the rx packet.
v Hash on the VLAN tag of the rx packet.
t Hash on the Layer 3 protocol field of the rx packet.
s Hash on the IP source address of the rx packet.
d Hash on the IP destination address of the rx packet.
f Hash on bytes 0 and 1 of the Layer 4 header of the rx packet.
n Hash on bytes 2 and 3 of the Layer 4 header of the rx packet.
r Discard all packets of this flow type. When this option is
set, all other options are ignored.

flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4|ip6|tcp6|udp6|ah6|esp6|sctp6
Inserts or updates a classification rule for the specified flow type.

ether Ethernet
ip4 Raw IPv4
tcp4 TCP over IPv4
udp4 UDP over IPv4
sctp4 SCTP over IPv4
ah4 IPSEC AH over IPv4
esp4 IPSEC ESP over IPv4
ip6 Raw IPv6
tcp6 TCP over IPv6
udp6 UDP over IPv6
sctp6 SCTP over IPv6
ah6 IPSEC AH over IPv6
esp6 IPSEC ESP over IPv6

For all fields that allow both a value and a mask to be specified, the mask may be
specified immediately after the value using the m keyword, or separately using the
field name keyword with -mask appended, e.g. src-mask.

src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
Includes the source MAC address, specified as 6 bytes in hexadecimal separated
by colons, along with an optional mask. Valid only for flow-type ether.

dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
Includes the destination MAC address, specified as 6 bytes in hexadecimal sepa-
rated 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 op-
tional mask. Valid for all IP based flow-types.

dst-ip ip-address [m ip-address]
Specify the destination IP address of the incoming packet to match along with
an optional mask. Valid for all IP based flow-types.

tos N [m N]
Specify the value of the Type of Service field in the incoming packet to match
along with an optional mask. Applies to all IPv4 based flow-types.

tclass N [m N]
Specify the value of the Traffic Class field in the incoming packet to match
along with an optional mask. Applies to all IPv6 based flow-types.

l4proto N [m N]
Includes the layer 4 protocol number and optional mask. Valid only for flow-
types ip4 and ip6.

src-port N [m N]
Specify the value of the source port field (applicable to TCP/UDP packets) in
the incoming packet to match along with an optional mask. Valid for flow-types
ip4, tcp4, udp4, and sctp4 and their IPv6 equivalents.

dst-port N [m N]
Specify the value of the destination port field (applicable to TCP/UDP pack-
ets)in the incoming packet to match along with an optional mask. Valid for
flow-types ip4, tcp4, udp4, and sctp4 and their IPv6 equivalents.

spi N [m N]
Specify the value of the security parameter index field (applicable to AH/ESP
packets)in the incoming packet to match along with an optional mask. Valid for
flow-types ip4, ah4, and esp4 and their IPv6 equivalents.

l4data N [m N]
Specify the value of the first 4 Bytes of Layer 4 in the incoming packet to
match along with an optional mask. Valid for ip4 and ip6 flow-types.

vlan-etype N [m N]
Includes the VLAN tag Ethertype and an optional mask.

vlan N [m N]
Includes the VLAN tag and an optional mask.

user-def N [m N]
Includes 64-bits of user-specific data and an optional mask.

dst-mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
Includes the destination MAC address, specified as 6 bytes in hexadecimal sepa-
rated by colons, along with an optional mask. Valid for all IP based flow-
types.

action N
Specifies the Rx queue to send packets to, or some other action.

-1 Drop the matched flow
-2 Use the matched flow as a Wake-on-LAN filter
0 or higher Rx queue to route the flow

context N
Specifies the RSS context to spread packets over multiple queues; either 0 for
the default RSS context, or a value returned by ethtool -X ... context new.

vf N Specifies the Virtual Function the filter applies to. Not compatible with ac-
tion.

queue N
Specifies the Rx queue to send packets to. Not compatible with action.

loc N Specify the location/ID to insert the rule. This will overwrite any rule
present in that location and will not go through any of the rule ordering
process.

delete N
Deletes the RX classification rule with the given ID.

-w --get-dump
Retrieves and prints firmware dump for the specified network device. By default,
it prints out the dump flag, version and length of the dump data. When data is in-
dicated, then ethtool fetches the dump data and directs it to a file.

-W --set-dump
Sets the dump flag for the device.

-T --show-time-stamping
Show the device's time stamping capabilities and associated PTP hardware clock.

-x --show-rxfh-indir --show-rxfh
Retrieves the receive flow hash indirection table and/or RSS hash key.

-X --set-rxfh-indir --rxfh
Configures the receive flow hash indirection table and/or RSS hash key.

hkey Sets RSS hash key of the specified network device. RSS hash key should be of
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 ze-
ro.

hfunc Sets RSS hash function of the specified network device. List of RSS hash func-
tions which kernel supports is shown as a part of the --show-rxfh command out-
put.

start N
For the equal and weight options, sets the starting receive queue for spreading
flows to N.

equal N
Sets the receive flow hash indirection table to spread flows evenly between the
first N receive queues.

weight W0 W1 ...
Sets the receive flow hash indirection table to spread flows between receive
queues according to the given weights. The sum of the weights must be non-zero
and must not exceed the size of the indirection table.

default
Sets the receive flow hash indirection table to its default value.

context CTX | new
Specifies an RSS context to act on; either new to allocate a new RSS context,
or CTX, a value returned by a previous ... context new.

delete Delete the specified RSS context. May only be used in conjunction with context
and a non-zero CTX value.

-f --flash
Write a firmware image to flash or other non-volatile memory on the device.

file Specifies the filename of the firmware image. The firmware must first be in-
stalled in one of the directories where the kernel firmware loader or firmware
agent will look, such as /lib/firmware.

N If the device stores multiple firmware images in separate regions of non-
volatile memory, this parameter may be used to specify which region is to be
written. The default is 0, requesting that all regions are written. All other
values are 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 inter-
rupts 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 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 sup-
ported). 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 sit-
uation with a peer PHY that may also have EDPD enabled. By default, this set-
ting 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 configura-
tion 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 support-
ed).

--get-tunable
Get the tunable parameters.

rx-copybreak
Get the current rx copybreak value in bytes.

tx-copybreak
Get the current tx copybreak value in bytes.

pfc-prevention-tout
Get the current pfc prevention timeout value in msecs.

--set-tunable
Set driver's tunable parameters.

rx-copybreak N
Set the rx copybreak value in bytes.

tx-copybreak N
Set the tx copybreak value in bytes.

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

--reset
Reset hardware components specified by flags and components listed below

flags N
Resets the components based on direct flags mask

mgmt Management processor

irq Interrupt requester

dma DMA engine

filter Filtering/flow direction

offload
Protocol offload

mac Media access controller

phy Transceiver/PHY

ram RAM shared between multiple components ap Application Processor

dedicated
All components dedicated to this interface

all All components used by this interface, even if shared

--show-fec
Queries the specified network device for its support of Forward Error Correction.

--set-fec
Configures Forward Error Correction for the specified network device.

Forward Error Correction modes selected by a user are expected to be persisted af-
ter 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 re-
port 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 driv-
ers.

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.

q.B --cable-test
Perform a cable test and report the results. What results are returned depends on
the capabilities of the network interface. Typically open pairs and shorted pairs
can be reported, along with pairs being O.K. When a fault is detected the approxi-
mate distance to the fault may be reported.

--cable-test-tdr
Perform a cable test and report the raw Time Domain Reflectometer data. A pulse is
sent down a cable pair and the amplitude of the reflection, for a given distance,
is reported. A break in the cable returns a big reflection. Minor damage to the ca-
ble returns a small reflection. If the cable is shorted, the amplitude of the re-
flection can be negative. By default, data is returned for lengths between 0 and
150m at 1m steps, for all pairs. However parameters can be passed to restrict the
collection of data. It should be noted, that the interface will round the distances
to whatever granularity is actually implemented. This is often 0.8 of a meter. The
results should include the actual rounded first and last distance and step size.

first N
Distance along the cable, in meters, where the first measurement should be
made.

last N
Distance along the cable, in meters, where the last measurement should be made.

step N
Distance, in meters, between each measurement.

pair N
Which pair should be measured. Typically a cable has 4 pairs. 0 = Pair A, 1 =
Pair B, ...

--monitor
Listens to netlink notification and displays them.

command
If argument matching a command is used, ethtool only shows notifications of
this type. Without such argument or with --all, all notification types are
shown.

devname
If a device name is used as argument, only notification for this device are
shown. Default is to show notifications for all devices.

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

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

AUTHOR
ethtool was written by David Miller.

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

AVAILABILITY
ethtool is available from <http://www.kernel.org/pub/software/network/ethtool/>

Ethtool version 5.16 January 2022 ETHTOOL(8)

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