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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | AUTHOR | AVAILABILITY | COLOPHON |
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ETHTOOL(8) System Manager's Manual ETHTOOL(8)
ethtool - query or control network driver and hardware settings
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]
[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
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]
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.
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
--json Output results in JavaScript Object Notation (JSON). Only
a subset of options support this. Those which do not will
continue to output plain text in the presence of this op‐
tion.
-I --include-statistics
Include command-related statistics in the output. This op‐
tion allows displaying relevant device statistics for se‐
lected get commands.
-a --show-pause
Queries the specified Ethernet device for pause parameter
information.
--src aggregate|emac|pmac
If the MAC Merge layer is supported, request a partic‐
ular source of device statistics (eMAC or pMAC, or
their aggregate). Only valid if ethtool was invoked
with the -I --include-statistics argument.
-A --pause
Changes the pause parameters of the specified Ethernet de‐
vice.
autoneg on|off
Specifies whether pause autonegotiation should be en‐
abled.
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 infor‐
mation.
-C --coalesce
Changes the coalescing settings of the specified network
device.
-g --show-ring
Queries the specified network device for rx/tx ring para‐
meter 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.
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
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 std‐
out. 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 net‐
work 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 speci‐
fied 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 pa‐
rameters 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 pro‐
tocol 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 en‐
abled
rxvlan on|off
Specifies whether RX VLAN acceleration should be en‐
abled
txvlan on|off
Specifies whether TX VLAN acceleration should be en‐
abled
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. Typi‐
cally this involves blinking one or more LEDs on the spe‐
cific network port.
[ N] Length of time to perform phys-id, in seconds.
-P --show-permaddr
Queries the specified network device for permanent hard‐
ware address.
-r --negotiate
Restarts auto-negotiation on the specified Ethernet de‐
vice, 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 statis‐
tics 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 partic‐
ular source of device statistics (eMAC or pMAC, or
their aggregate).
--phy-statistics
Queries the specified network device for PHY specific sta‐
tistics.
-t --test
Executes adapter selftest on the specified network device.
Possible test modes are:
offline
Perform full set of tests, possibly interrupting nor‐
mal 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 addi‐
tionally an external-loopback test.
-s --change
Allows changing some or all settings of the specified net‐
work 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.
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-mas‐
ter|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 sta‐
tus, on forces MDI-X (crossover) mode, while off means
MDI (straight through) mode. The driver should guar‐
antee 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 autonegotia‐
tion. 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
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
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.
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 op‐
tion 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 be‐
tween 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|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 spec‐
ified 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 spec‐
ified, the mask may be specified immediately after the value
using the m keyword, or separately using the field name key‐
word 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 op‐
tional 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 (ap‐
plicable 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 equiv‐
alents.
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.
-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 mul‐
tiple 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 compat‐
ible 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 net‐
work device. By default, it prints out the dump flag,
version and length of the dump data. When data is indi‐
cated, 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 associat‐
ed 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 de‐
vice. List of RSS hash functions which kernel sup‐
ports is shown as a part of the --show-rxfh command
output.
xfrm Sets the RSS input transformation. Currently, only the
symmetric-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 ) be‐
fore 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 destination 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 al‐
locate 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 mem‐
ory on the device.
file Specifies the filename of the firmware image. The
firmware must first be installed in one of the direc‐
tories where the kernel firmware loader or firmware
agent will look, such as /lib/firmware.
N If the device stores multiple firmware images in sepa‐
rate 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. 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 adver‐
tise
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 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 puls‐
es.
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 incom‐
patible with 1000BASE-T, PHY device provides an auto‐
matic 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 pos‐
sible. 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 compo‐
nents 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 net‐
work device.
Forward Error Correction modes selected by a user are ex‐
pected to be persisted after any hotplug events. If a mod‐
ule is swapped that does not support the current FEC mode,
the driver or firmware must take the link down administra‐
tively 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
options 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 ap‐
plied 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 in‐
clude --show-coalesce and --coalesce.
--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 de‐
tected the approximate distance to the fault may be re‐
ported.
--cable-test-tdr
Perform a cable test and report the raw Time Domain Re‐
flectometer 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 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 be‐
tween 0 and 150m at 1m steps, for all pairs. However para‐
meters can be passed to restrict the collection of data.
It should be noted, that the interface will round the dis‐
tances 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 argu‐
ment or with --all, all notification types are shown.
devname
If a device name is used as argument, only notifica‐
tion for this device are shown. Default is to show no‐
tifications 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 GENEVE 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 administratively 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 con‐
figured 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 exact‐
ly 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 (aPLCALo‐
calNodeID).
node-cnt N
The node-cnt [1 .. 255] should be set after the maxi‐
mum number of nodes that can be plugged to the multi-
drop network. This parameter regulates the minimum
length of the PLCA cycle. Therefore, it is only mean‐
ingful 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
opportunity timer in bit-times, and shall be set equal
across all the nodes sharing the same medium for PLCA
to work. The default 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 (aPLCATransmitOpportu‐
nityTimer).
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, meaning 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 pa‐
rameter maps to IEEE 802.3cg-2019 clause 30.16.1.1.6
(aPLCAMaxBurstCount).
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 intended.
--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 operating in plain CSMA/CD mode.
--show-mm
Show the MAC Merge layer state. The ethtool argument -I
--include-statistics can be used with this command, and
MAC Merge layer statistics counters will also be re‐
trieved.
pmac-enabled
Shows whether the pMAC is enabled and capable of re‐
ceiving traffic and SMD-V frames (and responding to
them with SMD-R replies).
tx-enabled
Shows whether transmission on the pMAC is administra‐
tively enabled.
tx-active
Shows whether transmission on the pMAC is active (ver‐
ification 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. Corresponds to the standard addFragSize vari‐
able using the formula:
tx-min-frag-size = 64 * (1 + addFragSize) - 4
rx-min-frag-size
Shows the minimum size (in octets) of non-final frag‐
ments which the local device supports receiving.
verify-enabled
Shows whether the verification state machine is en‐
abled. This process, if successful, ensures that pre‐
emptible 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 at‐
tempts, represented as an integer between 1 and 128
ms. The standard defines a fixed number of verifica‐
tion attempts (verifyLimit) before failing the verifi‐
cation 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 ma‐
chine of the local device. Values can be INITIAL,
VERIFYING, SUCCEEDED, 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 (aPoDLPSE‐
PowerDetectionStatus) with potential values being dis‐
abled, searching, delivering power, sleep, idle, error
--set-pse
Set Power Sourcing Equipment (PSE) parameters.
podl-pse-admin-control enable|disable
This parameter manages PoDL PSE Admin operations in
accordance with the IEEE 802.3-2018 30.15.1.2.1
(acPoDLPSEAdminControl) specification.
Not supported (in part or whole) on all network drivers.
ethtool was written by David Miller.
Modifications by Jeff Garzik, Tim Hockin, Jakub Jelinek, Andre
Majorel, Eli Kupermann, Scott Feldman, Andi Kleen, Alexander Duy‐
ck, Sucheta Chakraborty, Jesse Brandeburg, Ben Hutchings, Scott
Branden.
ethtool is available from
⟨http://www.kernel.org/pub/software/network/ethtool/⟩
This page is part of the ethtool (utility for controlling network
drivers and hardware) project. Information about the project can
be found at
⟨https://www.kernel.org/pub/software/network/ethtool/⟩. If you
have a bug report for this manual page, send it to
bwh@kernel.org, netdev@vger.kernel.org. This page was obtained
from the project's upstream Git repository
⟨git://git.kernel.org/pub/scm/network/ethtool/ethtool.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-05-23.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
Ethtool version 6.9 May 2024 ETHTOOL(8)
Pages that refer to this page: veth(4), ip-link(8), ovs-l3ping(8), ovs-test(8), ovs-vlan-test(8), tc-mqprio(8)
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