ethtool man page

ethtool — query or control network driver and hardware settings

Examples (TL;DR)

Synopsis

ethtool devname

ethtool -h|--help

ethtool --version

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]

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

ethtool --phy-statistics devname

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

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

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

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

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

ethtool -W|--set-dump devname N

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

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

ethtool -X|--set-rxfh-indir|--rxfh devname [hkey xx:yy:zz:aa:bb:cc:...] [start N] [ equal N | weight W0 W1 ... | default ] [hfunc FUNC] [context CTXnew] [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]

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 --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 [...]

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

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 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.

-a --show-pause

Queries the specified Ethernet device for pause parameter information.

-A --pause

Changes the pause parameters of the specified Ethernet device.

autoneg on|off

Specifies whether pause autonegotiation should be enabled.

rx on|off

Specifies whether RX pause should be enabled.

tx on|off

Specifies whether TX pause should be enabled.

-c --show-coalesce

Queries the specified network device for coalescing information.

-C --coalesce

Changes the coalescing settings of the specified network device.

-g --show-ring

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

-G --set-ring

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

rx N

Changes the number of ring entries for the Rx ring.

rx-mini N

Changes the number of ring entries for the Rx Mini ring.

rx-jumbo N

Changes the number of ring entries for the Rx Jumbo ring.

tx N

Changes the number of ring entries for the Tx ring.

-i --driver

Queries the specified network device for associated driver information.

-d --register-dump

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

-e --eeprom-dump

Retrieves and prints an EEPROM dump for the specified network device. When raw is 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 network device. offset and value specify which byte and it's new value. If value is not specified, stdin is read and written to the EEPROM. The length and offset parameters allow writing to 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 NIC- and driver-specific statistics.

--phy-statistics

Queries the specified network device for PHY specific statistics.

-t --test

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

offline

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

online

Perform limited set of tests, not interrupting normal operation,

external_lb

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

-s --change

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

speed N

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

duplex half|full

Sets full or half duplex mode.

port tp|aui|bnc|mii

Selects device port.

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 immediately, and if necessary may reset the link to cause the change to take effect.

autoneg on|off

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

advertise N

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

0x00110baseT Half
0x00210baseT Full
0x004100baseT Half
0x008100baseT Full
0x80000000000000000100baseT1 Full
0x0101000baseT Half(not supported by IEEE standards)
0x0201000baseT Full
0x1000000000000000001000baseT1 Full
0x200001000baseKX Full
0x200000000001000baseX Full
0x8000000000002500baseT Full
0x80002500baseX Full(not supported by IEEE standards)
0x10000000000005000baseT Full
0x100010000baseT Full
0x4000010000baseKX4 Full
0x8000010000baseKR Full
0x10000010000baseR_FEC
0x4000000000010000baseCR  Full
0x8000000000010000baseSR  Full
0x10000000000010000baseLR  Full
0x20000000000010000baseLRM Full
0x40000000000010000baseER  Full
0x20000020000baseMLD2 Full(not supported by IEEE standards)
0x40000020000baseKR2 Full(not supported by IEEE standards)
0x8000000025000baseCR Full
0x10000000025000baseKR Full
0x20000000025000baseSR Full
0x80000040000baseKR4 Full
0x100000040000baseCR4 Full
0x200000040000baseSR4 Full
0x400000040000baseLR4 Full
0x40000000050000baseCR2 Full
0x80000000050000baseKR2 Full
0x1000000000050000baseSR2 Full
0x1000000000000050000baseKR Full
0x2000000000000050000baseSR Full
0x4000000000000050000baseCR Full
0x8000000000000050000baseLR_ER_FR Full
0x10000000000000050000baseDR Full
0x800000056000baseKR4 Full
0x1000000056000baseCR4 Full
0x2000000056000baseSR4 Full
0x4000000056000baseLR4 Full
0x1000000000100000baseKR4 Full
0x2000000000100000baseSR4 Full
0x4000000000100000baseCR4 Full
0x8000000000100000baseLR4_ER4 Full
0x200000000000000100000baseKR2 Full
0x400000000000000100000baseSR2 Full
0x800000000000000100000baseCR2 Full
0x1000000000000000100000baseLR2_ER2_FR2 Full
0x2000000000000000100000baseDR2 Full
0x4000000000000000200000baseKR4 Full
0x8000000000000000200000baseSR4 Full
0x10000000000000000200000baseLR4_ER4_FR4 Full
0x20000000000000000200000baseDR4 Full
0x40000000000000000200000baseCR4 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.

pWake on PHY activity
uWake on unicast messages
mWake on multicast messages
bWake on broadcast messages
aWake on ARP
gWake on MagicPacket™
sEnable SecureOn™ password for MagicPacket™
fWake on filter(s)
dDisable (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:

drv0x0001  General driver status
probe0x0002  Hardware probing
link0x0004  Link state
timer0x0008  Periodic status check
ifdown0x0010  Interface being brought down
ifup0x0020  Interface being brought up
rx_err0x0040  Receive error
tx_err0x0080  Transmit error
tx_queued0x0100  Transmit queueing
intr0x0200  Interrupt handling
tx_done0x0400  Transmit completion
rx_status0x0800  Receive completion
pktdata0x1000  Packet contents
hw0x2000  Hardware status
wol0x4000  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.

tcp4TCP over IPv4
udp4UDP over IPv4
ah4IPSEC AH over IPv4
esp4IPSEC ESP over IPv4
sctp4SCTP over IPv4
tcp6TCP over IPv6
udp6UDP over IPv6
ah6IPSEC AH over IPv6
esp6IPSEC ESP over IPv6
sctp6SCTP 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.

mHash on the Layer 2 destination address of the rx packet.
vHash on the VLAN tag of the rx packet.
tHash on the Layer 3 protocol field of the rx packet.
sHash on the IP source address of the rx packet.
dHash on the IP destination address of the rx packet.
fHash on bytes 0 and 1 of the Layer 4 header of the rx packet.
nHash on bytes 2 and 3 of the Layer 4 header of the rx packet.
rDiscard 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.

etherEthernet
ip4Raw IPv4
tcp4TCP over IPv4
udp4UDP over IPv4
sctp4SCTP over IPv4
ah4IPSEC AH over IPv4
esp4IPSEC ESP over IPv4
ip6Raw IPv6
tcp6TCP over IPv6
udp6UDP over IPv6
sctp6SCTP over IPv6
ah6IPSEC AH over IPv6
esp6IPSEC 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 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 (applicable to TCP/UDP packets)in the incoming packet to match along with an optional mask. Valid for flow-types ip4, tcp4, udp4, and sctp4 and their IPv6 equivalents.

spi N [m N]

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

l4data N [m N]

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

vlan-etype N [m N]

Includes the VLAN tag Ethertype and an optional mask.

vlan N [m N]

Includes the VLAN tag and an optional mask.

user-def N [m N]

Includes 64-bits of user-specific data and an optional mask.

dst-mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]

Includes the destination MAC address, specified as 6 bytes in hexadecimal 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.

-1Drop the matched flow
-2Use the matched flow as a Wake-on-LAN filter
0 or higherRx queue to route the flow
context N

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

vf N

Specifies the Virtual Function the filter applies to. Not compatible with action.

queue N

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

loc N

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

delete N

Deletes the RX classification rule with the given ID.

-w --get-dump

Retrieves and prints firmware dump for the specified network device. By default, it prints out the dump flag, version and length of the dump data. When data is 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.

-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.

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 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 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.

--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.

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).

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 pulses.

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).

--reset

Reset hardware components specified by flags and components listed below

flags N

Resets the components based on direct flags mask

mgmt

Management processor

irq

Interrupt requester

dma

DMA engine

filter

Filtering/flow direction

offload

Protocol offload

mac

Media access controller

phy

Transceiver/PHY

ram

RAM shared between multiple components ap Application Processor

dedicated

All components dedicated to this interface

all

All components used by this interface, even if shared

--show-fec

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

--set-fec

Configures Forward Error Correction for the specified network device.

Forward Error Correction modes selected by a user are expected to be persisted after any hotplug events. If a module is swapped that does not support the current FEC mode, the driver or firmware must take the link down administratively and report the problem in the system logs for users to correct.

encoding auto|off|rs|baser [...]

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.

autoUse the driver's default encoding
offTurn off FEC
RSForce RS-FEC encoding
BaseRForce BaseR 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.

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/

Referenced By

iftab(5), ip-link(8), mii-tool(8), netsniff-ng(8), nicstat(1), pethtool(8), veth(4).

January 2020 Ethtool version 5.4