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 -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|d...] [sopass xx:yy:zz:aa:bb:cc]
[msglvl N | 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 |
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:...] [ equal N | weight W0 W1
... | default ]
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]
DESCRIPTION
ethtool is used to query and control network device driver and hardware settings, particularly for wired Eth‐
ernet 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.
-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 persis‐
tent nature of writing to the EEPROM, a device-specific magic key must be specified to prevent the ac‐
cidental 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 fea‐
ture 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.
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.
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
0x010 1000baseT Half (not supported by IEEE standards)
0x020 1000baseT Full
0x20000 1000baseKX Full
0x8000 2500baseX Full (not supported by IEEE standards)
0x1000 10000baseT Full
0x40000 10000baseKX4 Full
0x80000 10000baseKR 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
0x1000000000 100000baseKR4 Full
0x2000000000 100000baseSR4 Full
0x4000000000 100000baseCR4 Full
0x8000000000 100000baseLR4_ER4 Full
phyad N
PHY address.
xcvr internal|external
Selects transceiver type. Currently only internal and external can be specified, in the future fur‐
ther types might be added.
wol p|u|m|b|a|g|s|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™
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.
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 x.x.x.x [m x.x.x.x]
Specify the source IP address of the incoming packet to match along with an optional mask. Valid
for all IPv4 based flow-types.
dst-ip x.x.x.x [m x.x.x.x]
Specify the destination IP address of the incoming packet to match along with an optional mask.
Valid for all IPv4 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 op‐
tional mask. Applies to all IPv4 based flow-types.
l4proto N [m N]
Includes the layer 4 protocol number and optional mask. Valid only for flow-type ip4.
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.
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.
spi N [m N]
Specify the value of the security parameter index field (applicable to AH/ESP packets)in the incom‐
ing packet to match along with an optional mask. Valid for flow-types ip4, ah4, and esp4.
l4data N [m N]
Specify the value of the first 4 Bytes of Layer 4 in the incoming packet to match along with an op‐
tional mask. Valid for ip4 flow-type.
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.
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.
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 in‐
direction table.
default
Sets the receive flow hash indirection table to its default 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 pa‐
rameter 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.
-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 mi‐
croseconds). This has meaning only when Tx LPI is enabled.
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.
AVAILABILITY
ethtool is available from ⟨http://www.kernel.org/pub/software/network/ethtool/⟩
Ethtool version 4.5 March 2016 ETHTOOL(8)
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