NAME¶

ethtool - query or control network driver and hardware settings

SYNOPSIS¶

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.

-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.

-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:

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)
0x800000	40000baseKR4 Full
0x1000000	40000baseCR4 Full
0x2000000	40000baseSR4 Full
0x4000000	40000baseLR4 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|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™
d	Disable (wake on nothing). This option clears all previous options.

sopass xx:yy:zz:aa: bb :ccSets 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 ...

-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

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

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 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 optional 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 incoming 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 optional 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.

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 IPv4 based flow-types.

action N

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

-1	Drop the matched flow
0 or higher	Rx queue to route the flow

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.

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.

-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 capabiliities. 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.

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.

AVAILABILITY¶

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