ETHTOOL(8)ETHTOOL(8)NAMEethtool - query or control network driver and hardware settings
SYNOPSISethtool 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-offload devname
ethtool -K|--offload devname [rx on|off] [tx on|off] [sg on|off]
[tso on|off] [ufo on|off] [gso on|off] [gro on|off] [lro on|off]
[rxvlan on|off] [txvlan on|off] [rxhash on|off]
ethtool -p|--identify devname [N]
ethtool -P|--show-permaddr devname
ethtool -r|--negotiate devname
ethtool -S|--statistics devname
ethtool -t|--test devname [offline|online|external_lb]
ethtool-s devname speed N [duplex half|full] [port tp|aui|bnc|mii]
[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 devname
rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
ethtool-N devname
rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
m|v|t|s|d|f|n|r...
ethtool -w|--get-dump devname [data filename]
ethtool -W|--set-dump devname N
ethtool -x|--show-rxfh-indir devname
ethtool -X|--set-rxfh-indir devname [ equal N | weight W0 W1 ... ]
ethtool -f|--flash devname FILE [N]
ethtool -u|--show-ntuple devname [rule N]
ethtool -U|--config-ntuple devname [delete N]
[ flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4
[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 x.x.x.x [m x.x.x.x]] [dst-ip x.x.x.x [m x.x.x.x]]
[tos 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]]
[action N] [loc N] ]
ethtool -l|--show-channels devname
ethtool -L|--set-channels devname [rx N] [tx N] [other N] [combined N]
ethtool--show-priv-flags devname
ethtool--set-priv-flags devname flag on|off ...
DESCRIPTIONethtool 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 oper‐
ate.
OPTIONSethtool with a single argument specifying the device name prints cur‐
rent 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 infor‐
mation.
-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 de‐
vice.
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 in‐
formation.
-d --register-dump
Retrieves and prints a register dump for the specified network
device. The register format for some devices is known and de‐
coded others are printed in hex. When raw is enabled, then eth‐
tool dumps the raw register data to stdout. If file is speci‐
fied, 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 cer‐
tain portions of the EEPROM. Default is to dump the entire EEP‐
ROM.
-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 na‐
ture of writing to the EEPROM, a device-specific magic key must
be specified to prevent the accidental writing to the EEPROM.
-k --show-offload
Queries the specified network device for offload information.
-K --offload
Changes the offload parameters of the specified network device.
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
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 in‐
volves 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 ad‐
dress.
-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-specif‐
ic statistics.
-t --test
Executes adapter selftest on the specified network device. Pos‐
sible test modes are:
offline|online|external_lb
defines test type: offline (default) means to perform full set
of tests possibly causing normal operation interruption during
the tests, online means to perform limited set of tests do not
interrupting normal adapter operation, external_lb means to per‐
form external-loopback test in addition to other offline tests.
-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 ar‐
gument will show you the supported device speeds.
duplex half|full
Sets full or half duplex mode.
port tp|aui|bnc|mii
Selects device port.
autoneg on|off
Specifies whether autonegotiation should be enabled. Autonegoti‐
ation 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 10 Half
0x002 10 Full
0x004 100 Half
0x008 100 Full
0x010 1000 Half (not supported by IEEE standards)
0x020 1000 Full
0x8000 2500 Full (not supported by IEEE standards)
0x1000 10000 Full
0x20000 20000MLD2 Full (not supported by IEEE standards)
0x40000 20000KR2 Full (not supported by IEEE standards)
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: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:
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 --show-nfc
Retrieves the receive network flow classification configura‐
tions.
rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
Retrieves the hash options for the specified network traffic
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
-N --config-nfc
Configures the receive network flow classification.
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 network traffic
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.
-w --get-dump
Retrieves and prints firmware dump for the specified network de‐
vice. 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.
-x --show-rxfh-indir
Retrieves the receive flow hash indirection table.
-X --set-rxfh-indir
Configures the receive flow hash indirection table.
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 be‐
tween 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 FILE
Flash firmware image from the specified file to a region on the
adapter. By default this will flash all the regions on the
adapter.
N A number to identify flash region where the image should be
flashed. Default region is 0 which denotes all regions in the
flash.
-u --show-ntuple
Get Rx ntuple filters and actions, then display them to the us‐
er.
rule N Retrieves the RX classification rule with the given ID.
-U --config-ntuple
Configure Rx ntuple filters and actions
delete N
Deletes the RX classification rule with the given ID.
flow-type ether|ip4|tcp4|udp4|sctp4|ah4|esp4
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
All fields below that include a mask option may either use "m" to indi‐
cate a mask, or may use the full name of the field with a "-mask" ap‐
pended to indicate that this is the mask for a given field.
src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
Includes the source MAC address, specified as 6 bytes in hexa‐
decimal 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 option‐
al 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 [l4m 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 (appli‐
cable 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 incom‐
ing 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.
action N
Specifies the Rx queue to send packets to, or some other action.
-2 Clear the filter
-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.
-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.
--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.
BUGS
Not supported (in part or whole) on all network drivers.
AUTHORethtool 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.
AVAILABILITYethtool is available from
⟨http://www.kernel.org/pub/software/network/ethtool/⟩
Ethtool version 3.2 January 2011 ETHTOOL(8)
