1ETHTOOL(8)                  System Manager's Manual                 ETHTOOL(8)
2
3
4

NAME

6       ethtool - query or control network driver and hardware settings
7

SYNOPSIS

9       ethtool devname
10
11       ethtool -h|--help
12
13       ethtool --version
14
15       ethtool -a|--show-pause devname
16
17       ethtool -A|--pause devname [autoneg on|off] [rx on|off] [tx on|off]
18
19       ethtool -c|--show-coalesce devname
20
21       ethtool -C|--coalesce devname [adaptive-rx on|off] [adaptive-tx on|off]
22              [rx-usecs N] [rx-frames N] [rx-usecs-irq N] [rx-frames-irq N]
23              [tx-usecs N] [tx-frames N] [tx-usecs-irq N] [tx-frames-irq N]
24              [stats-block-usecs N] [pkt-rate-low N] [rx-usecs-low N]
25              [rx-frames-low N] [tx-usecs-low N] [tx-frames-low N]
26              [pkt-rate-high N] [rx-usecs-high N] [rx-frames-high N]
27              [tx-usecs-high N] [tx-frames-high N] [sample-interval N]
28
29       ethtool -g|--show-ring devname
30
31       ethtool -G|--set-ring devname [rx N] [rx-mini N] [rx-jumbo N] [tx N]
32
33       ethtool -i|--driver devname
34
35       ethtool -d|--register-dump devname [raw on|off] [hex on|off] [file
36              name]
37
38       ethtool -e|--eeprom-dump devname [raw on|off] [offset N] [length N]
39
40       ethtool -E|--change-eeprom devname [magic N] [offset N] [length N]
41              [value N]
42
43       ethtool -k|--show-features|--show-offload devname
44
45       ethtool -K|--features|--offload devname feature on|off ...
46
47       ethtool -p|--identify devname [N]
48
49       ethtool -P|--show-permaddr devname
50
51       ethtool -r|--negotiate devname
52
53       ethtool -S|--statistics devname
54
55       ethtool --phy-statistics devname
56
57       ethtool -t|--test devname [offline|online|external_lb]
58
59       ethtool -s devname [speed N] [duplex half|full] [port tp|aui|bnc|mii]
60              [mdix auto|on|off] [autoneg on|off] [advertise N] [phyad N]
61              [xcvr internal|external] [wol p|u|m|b|a|g|s|f|d...]
62              [sopass xx:yy:zz:aa:bb:cc] [msglvl N | msglvl type on|off ...]
63
64       ethtool -n|-u|--show-nfc|--show-ntuple devname
65              [ rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6 |
66              rule N ]
67
68       ethtool -N|-U|--config-nfc|--config-ntuple devname
69              rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
70              m|v|t|s|d|f|n|r... |
71              flow-type
72              ether|ip4|tcp4|udp4|sctp4|ah4|esp4|ip6|tcp6|udp6|ah6|esp6|sctp6
73              [src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]]
74              [dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [proto N [m N]]
75              [src-ip ip-address [m ip-address]] [dst-ip ip-address [m ip-
76              address]] [tos N [m N]] [tclass N [m N]] [l4proto N [m N]]
77              [src-port N [m N]] [dst-port N [m N]] [spi N [m N]]
78              [l4data N [m N]] [vlan-etype N [m N]] [vlan N [m N]]
79              [user-def N [m N]] [dst-
80              mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]] [action N]
81              [context N] [loc N] |
82              delete N
83
84       ethtool -w|--get-dump devname [data filename]
85
86       ethtool -W|--set-dump devname N
87
88       ethtool -T|--show-time-stamping devname
89
90       ethtool -x|--show-rxfh-indir|--show-rxfh devname
91
92       ethtool -X|--set-rxfh-indir|--rxfh devname [hkey xx:yy:zz:aa:bb:cc:...]
93              [ equal N | weight W0 W1 ... | default ] [hfunc FUNC] [context
94              CTX | new] [delete]
95
96       ethtool -f|--flash devname file [N]
97
98       ethtool -l|--show-channels devname
99
100       ethtool -L|--set-channels devname [rx N] [tx N] [other N] [combined N]
101
102       ethtool -m|--dump-module-eeprom|--module-info devname [raw on|off]
103              [hex on|off] [offset N] [length N]
104
105       ethtool --show-priv-flags devname
106
107       ethtool --set-priv-flags devname flag on|off ...
108
109       ethtool --show-eee devname
110
111       ethtool --set-eee devname [eee on|off] [tx-lpi on|off] [tx-timer N]
112              [advertise N]
113
114       ethtool --set-phy-tunable devname [ downshift on|off [count N] ]
115
116       ethtool --get-phy-tunable devname [downshift]
117
118       ethtool --reset devname [flags N] [mgmt] [mgmt-shared] [irq] [irq-
119              shared] [dma] [dma-shared] [filter] [filter-shared] [offload]
120              [offload-shared] [mac] [mac-shared] [phy] [phy-shared] [ram]
121              [ram-shared] [ap] [ap-shared] [dedicated] [all]
122
123       ethtool --show-fec devname
124
125       ethtool --set-fec devname encoding auto|off|rs|baser [...]
126
127

DESCRIPTION

129       ethtool is used to query and control network device driver and hardware
130       settings, particularly for wired Ethernet devices.
131
132       devname is the name of the network device on which ethtool should oper‐
133       ate.
134
135

OPTIONS

137       ethtool  with  a single argument specifying the device name prints cur‐
138       rent settings of the specified device.
139
140       -h --help
141              Shows a short help message.
142
143       --version
144              Shows the ethtool version number.
145
146       -a --show-pause
147              Queries the specified Ethernet device for pause parameter infor‐
148              mation.
149
150       -A --pause
151              Changes the pause parameters of the specified Ethernet device.
152
153           autoneg on|off
154                  Specifies whether pause autonegotiation should be enabled.
155
156           rx on|off
157                  Specifies whether RX pause should be enabled.
158
159           tx on|off
160                  Specifies whether TX pause should be enabled.
161
162       -c --show-coalesce
163              Queries the specified network device for coalescing information.
164
165       -C --coalesce
166              Changes the coalescing settings of the specified network device.
167
168       -g --show-ring
169              Queries  the  specified  network device for rx/tx ring parameter
170              information.
171
172       -G --set-ring
173              Changes the rx/tx ring parameters of the specified  network  de‐
174              vice.
175
176           rx N   Changes the number of ring entries for the Rx ring.
177
178           rx-mini N
179                  Changes the number of ring entries for the Rx Mini ring.
180
181           rx-jumbo N
182                  Changes the number of ring entries for the Rx Jumbo ring.
183
184           tx N   Changes the number of ring entries for the Tx ring.
185
186       -i --driver
187              Queries  the  specified network device for associated driver in‐
188              formation.
189
190       -d --register-dump
191              Retrieves and prints a register dump for the  specified  network
192              device.   The  register format for some devices is known and de‐
193              coded others are printed in hex.  When raw is enabled, then eth‐
194              tool  dumps  the raw register data to stdout.  If file is speci‐
195              fied, then use contents of previous raw  register  dump,  rather
196              than reading from the device.
197
198       -e --eeprom-dump
199              Retrieves  and  prints  an EEPROM dump for the specified network
200              device.  When raw is enabled, then it dumps the raw EEPROM  data
201              to  stdout.  The length and offset parameters allow dumping cer‐
202              tain portions of the EEPROM.  Default is to dump the entire EEP‐
203              ROM.
204
205           raw on|off
206
207           offset N
208
209           length N
210
211       -E --change-eeprom
212              If  value  is  specified,  changes EEPROM byte for the specified
213              network device.  offset and value specify which  byte  and  it's
214              new  value. If value is not specified, stdin is read and written
215              to the EEPROM. The length and offset parameters allow writing to
216              certain  portions  of the EEPROM.  Because of the persistent na‐
217              ture of writing to the EEPROM, a device-specific magic key  must
218              be specified to prevent the accidental writing to the EEPROM.
219
220       -k --show-features --show-offload
221              Queries  the  specified network device for the state of protocol
222              offload and other features.
223
224       -K --features --offload
225              Changes the offload parameters and other features of the  speci‐
226              fied  network  device.  The following feature names are built-in
227              and others may be defined by the kernel.
228
229           rx on|off
230                  Specifies whether RX checksumming should be enabled.
231
232           tx on|off
233                  Specifies whether TX checksumming should be enabled.
234
235           sg on|off
236                  Specifies whether scatter-gather should be enabled.
237
238           tso on|off
239                  Specifies whether TCP segmentation  offload  should  be  en‐
240                  abled.
241
242           ufo on|off
243                  Specifies  whether  UDP  fragmentation offload should be en‐
244                  abled
245
246           gso on|off
247                  Specifies whether generic segmentation offload should be en‐
248                  abled
249
250           gro on|off
251                  Specifies whether generic receive offload should be enabled
252
253           lro on|off
254                  Specifies whether large receive offload should be enabled
255
256           rxvlan on|off
257                  Specifies whether RX VLAN acceleration should be enabled
258
259           txvlan on|off
260                  Specifies whether TX VLAN acceleration should be enabled
261
262           ntuple on|off
263                  Specifies  whether  Rx  ntuple filters and actions should be
264                  enabled
265
266           rxhash on|off
267                  Specifies whether receive hashing offload should be enabled
268
269       -p --identify
270              Initiates adapter-specific action intended to enable an operator
271              to  easily  identify  the  adapter by sight.  Typically this in‐
272              volves blinking one or more LEDs on the specific network port.
273
274           [ N]   Length of time to perform phys-id, in seconds.
275
276       -P --show-permaddr
277              Queries the specified network device for permanent hardware  ad‐
278              dress.
279
280       -r --negotiate
281              Restarts  auto-negotiation  on the specified Ethernet device, if
282              auto-negotiation is enabled.
283
284       -S --statistics
285              Queries the specified network device for NIC- and driver-specif‐
286              ic statistics.
287
288       --phy-statistics
289              Queries  the  specified  network device for PHY specific statis‐
290              tics.
291
292       -t --test
293              Executes adapter selftest on the specified network device.  Pos‐
294              sible test modes are:
295
296           offline
297                  Perform  full set of tests, possibly interrupting normal op‐
298                  eration during the tests,
299
300           online Perform limited set of tests, not interrupting normal opera‐
301                  tion,
302
303           external_lb
304                  Perform  full set of tests, as for offline, and additionally
305                  an external-loopback test.
306
307       -s --change
308              Allows changing some or all settings of  the  specified  network
309              device.  All following options only apply if -s was specified.
310
311           speed N
312                  Set  speed in Mb/s.  ethtool with just the device name as an
313                  argument will show you the supported device speeds.
314
315           duplex half|full
316                  Sets full or half duplex mode.
317
318           port tp|aui|bnc|mii
319                  Selects device port.
320
321           mdix auto|on|off
322                  Selects MDI-X mode for port. May be used to override the au‐
323                  tomatic  detection  feature of most adapters. An argument of
324                  auto means automatic detection of MDI status, on forces MDI-
325                  X  (crossover)  mode, while off means MDI (straight through)
326                  mode.  The driver should guarantee that this  command  takes
327                  effect  immediately,  and if necessary may reset the link to
328                  cause the change to take effect.
329
330           autoneg on|off
331                  Specifies whether autonegotiation should be enabled. Autone‐
332                  gotiation is enabled by default, but in some network devices
333                  may have trouble with it, so you can disable  it  if  really
334                  necessary.
335
336           advertise N
337                  Sets  the  speed  and  duplex advertised by autonegotiation.
338                  The argument is a hexadecimal value using one or a  combina‐
339                  tion of the following values:
340
341                  0x001             10baseT Half
342                  0x002             10baseT Full
343                  0x004             100baseT Half
344                  0x008             100baseT Full
345                  0x010             1000baseT Half           (not supported by IEEE standards)
346                  0x020             1000baseT Full
347                  0x20000           1000baseKX Full
348                  0x20000000000     1000baseX Full
349                  0x800000000000    2500baseT Full
350                  0x8000            2500baseX Full           (not supported by IEEE standards)
351                  0x1000000000000   5000baseT Full
352                  0x1000            10000baseT Full
353                  0x40000           10000baseKX4 Full
354                  0x80000           10000baseKR Full
355                  0x40000000000     10000baseCR  Full
356                  0x80000000000     10000baseSR  Full
357                  0x100000000000    10000baseLR  Full
358                  0x200000000000    10000baseLRM Full
359                  0x400000000000    10000baseER  Full
360                  0x200000          20000baseMLD2 Full       (not supported by IEEE standards)
361                  0x400000          20000baseKR2 Full        (not supported by IEEE standards)
362                  0x80000000        25000baseCR Full
363                  0x100000000       25000baseKR Full
364                  0x200000000       25000baseSR Full
365                  0x800000          40000baseKR4 Full
366                  0x1000000         40000baseCR4 Full
367                  0x2000000         40000baseSR4 Full
368                  0x4000000         40000baseLR4 Full
369                  0x400000000       50000baseCR2 Full
370                  0x800000000       50000baseKR2 Full
371                  0x10000000000     50000baseSR2 Full
372                  0x8000000         56000baseKR4 Full
373                  0x10000000        56000baseCR4 Full
374                  0x20000000        56000baseSR4 Full
375                  0x40000000        56000baseLR4 Full
376                  0x1000000000      100000baseKR4 Full
377                  0x2000000000      100000baseSR4 Full
378                  0x4000000000      100000baseCR4 Full
379                  0x8000000000      100000baseLR4_ER4 Full
380
381           phyad N
382                  PHY address.
383
384           xcvr internal|external
385                  Selects transceiver type. Currently only internal and exter‐
386                  nal can be specified, in the future further types  might  be
387                  added.
388
389           wol p|u|m|b|a|g|s|f|d...
390                  Sets  Wake-on-LAN  options.   Not  all devices support this.
391                  The argument to this option is a string of characters speci‐
392                  fying which options to enable.
393
394                  p   Wake on PHY activity
395                  u   Wake on unicast messages
396                  m   Wake on multicast messages
397                  b   Wake on broadcast messages
398                  a   Wake on ARP
399                  g   Wake on MagicPacket™
400                  s   Enable SecureOn™ password for MagicPacket™
401                  f   Wake on filter(s)
402                  d   Disable  (wake  on  nothing).  This option
403                      clears all previous options.
404
405           sopass xx:yy:zz:aa:bb:cc
406                  Sets the SecureOn™ password.  The argument  to  this  option
407                  must    be    6   bytes   in   Ethernet   MAC   hex   format
408                  (xx:yy:zz:aa:bb:cc).
409
410           msglvl N
411           msglvl type on|off ...
412                  Sets the driver message type flags by name or  number.  type
413                  names  the type of message to enable or disable; N specifies
414                  the new flags numerically. The defined type names  and  num‐
415                  bers are:
416
417                  drv         0x0001  General driver status
418                  probe       0x0002  Hardware probing
419                  link        0x0004  Link state
420                  timer       0x0008  Periodic status check
421                  ifdown      0x0010  Interface being brought down
422                  ifup        0x0020  Interface being brought up
423                  rx_err      0x0040  Receive error
424                  tx_err      0x0080  Transmit error
425                  tx_queued   0x0100  Transmit queueing
426                  intr        0x0200  Interrupt handling
427                  tx_done     0x0400  Transmit completion
428                  rx_status   0x0800  Receive completion
429                  pktdata     0x1000  Packet contents
430                  hw          0x2000  Hardware status
431                  wol         0x4000  Wake-on-LAN status
432
433                  The  precise  meanings  of  these  type flags differ between
434                  drivers.
435
436       -n -u --show-nfc --show-ntuple
437              Retrieves receive network flow classification options or rules.
438
439           rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
440                  Retrieves the hash options for the specified flow type.
441
442                  tcp4    TCP over IPv4
443                  udp4    UDP over IPv4
444                  ah4     IPSEC AH over IPv4
445                  esp4    IPSEC ESP over IPv4
446                  sctp4   SCTP over IPv4
447                  tcp6    TCP over IPv6
448                  udp6    UDP over IPv6
449                  ah6     IPSEC AH over IPv6
450                  esp6    IPSEC ESP over IPv6
451                  sctp6   SCTP over IPv6
452
453           rule N Retrieves the RX classification rule with the given ID.
454
455       -N -U --config-nfc --config-ntuple
456              Configures receive network flow classification options or rules.
457
458           rx-flow-hash tcp4|udp4|ah4|esp4|sctp4|tcp6|udp6|ah6|esp6|sctp6
459           m|v|t|s|d|f|n|r...
460                  Configures the hash options for the specified flow type.
461
462                  m   Hash on the Layer 2 destination address of the rx packet.
463                  v   Hash on the VLAN tag of the rx packet.
464                  t   Hash on the Layer 3 protocol field of the rx packet.
465                  s   Hash on the IP source address of the rx packet.
466                  d   Hash on the IP destination address of the rx packet.
467                  f   Hash on bytes 0 and 1 of the Layer 4 header of the rx packet.
468                  n   Hash on bytes 2 and 3 of the Layer 4 header of the rx packet.
469                  r   Discard  all  packets  of this flow type. When this option is
470                      set, all other options are ignored.
471
472           flow-type
473           ether|ip4|tcp4|udp4|sctp4|ah4|esp4|ip6|tcp6|udp6|ah6|esp6|sctp6
474                  Inserts  or  updates a classification rule for the specified
475                  flow type.
476
477                  ether   Ethernet
478                  ip4     Raw IPv4
479                  tcp4    TCP over IPv4
480                  udp4    UDP over IPv4
481                  sctp4   SCTP over IPv4
482                  ah4     IPSEC AH over IPv4
483                  esp4    IPSEC ESP over IPv4
484                  ip6     Raw IPv6
485                  tcp6    TCP over IPv6
486                  udp6    UDP over IPv6
487                  sctp6   SCTP over IPv6
488                  ah6     IPSEC AH over IPv6
489                  esp6    IPSEC ESP over IPv6
490
491           For all fields that allow both a value and a mask to be  specified,
492           the  mask  may be specified immediately after the value using the m
493           keyword, or separately using the field name keyword with -mask  ap‐
494           pended, e.g. src-mask.
495
496           src xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
497                  Includes  the  source  MAC  address, specified as 6 bytes in
498                  hexadecimal separated by  colons,  along  with  an  optional
499                  mask.  Valid only for flow-type ether.
500
501           dst xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
502                  Includes  the  destination MAC address, specified as 6 bytes
503                  in hexadecimal separated by colons, along with  an  optional
504                  mask.  Valid only for flow-type ether.
505
506           proto N [m N]
507                  Includes the Ethernet protocol number (ethertype) and an op‐
508                  tional mask.  Valid only for flow-type ether.
509
510           src-ip ip-address [m ip-address]
511                  Specify the source IP address  of  the  incoming  packet  to
512                  match  along  with an optional mask.  Valid for all IP based
513                  flow-types.
514
515           dst-ip ip-address [m ip-address]
516                  Specify the destination IP address of the incoming packet to
517                  match  along  with an optional mask.  Valid for all IP based
518                  flow-types.
519
520           tos N [m N]
521                  Specify the value of the Type of Service field in the incom‐
522                  ing packet to match along with an optional mask.  Applies to
523                  all IPv4 based flow-types.
524
525           tclass N [m N]
526                  Specify the value of the Traffic Class field in the incoming
527                  packet to match along with an optional mask.  Applies to all
528                  IPv6 based flow-types.
529
530           l4proto N [m N]
531                  Includes the layer 4  protocol  number  and  optional  mask.
532                  Valid only for flow-types ip4 and ip6.
533
534           src-port N [m N]
535                  Specify  the  value  of the source port field (applicable to
536                  TCP/UDP packets) in the incoming packet to match along  with
537                  an optional mask.  Valid for flow-types ip4, tcp4, udp4, and
538                  sctp4 and their IPv6 equivalents.
539
540           dst-port N [m N]
541                  Specify the value of the destination port field  (applicable
542                  to  TCP/UDP  packets)in  the  incoming packet to match along
543                  with an optional mask.   Valid  for  flow-types  ip4,  tcp4,
544                  udp4, and sctp4 and their IPv6 equivalents.
545
546           spi N [m N]
547                  Specify the value of the security parameter index field (ap‐
548                  plicable to AH/ESP packets)in the incoming packet  to  match
549                  along with an optional mask.  Valid for flow-types ip4, ah4,
550                  and esp4 and their IPv6 equivalents.
551
552           l4data N [m N]
553                  Specify the value of the first 4 Bytes of Layer 4 in the in‐
554                  coming  packet  to match along with an optional mask.  Valid
555                  for ip4 and ip6 flow-types.
556
557           vlan-etype N [m N]
558                  Includes the VLAN tag Ethertype and an optional mask.
559
560           vlan N [m N]
561                  Includes the VLAN tag and an optional mask.
562
563           user-def N [m N]
564                  Includes 64-bits of user-specific data and an optional mask.
565
566           dst-mac xx:yy:zz:aa:bb:cc [m xx:yy:zz:aa:bb:cc]
567                  Includes the destination MAC address, specified as  6  bytes
568                  in  hexadecimal  separated by colons, along with an optional
569                  mask.  Valid for all IP based flow-types.
570
571           action N
572                  Specifies the Rx queue to send packets to, or some other ac‐
573                  tion.
574
575                  -1            Drop the matched flow
576                  -2            Use the matched flow as a Wake-on-LAN filter
577                  0 or higher   Rx queue to route the flow
578
579           context N
580                  Specifies  the  RSS  context to spread packets over multiple
581                  queues; either 0 for the default RSS context, or a value re‐
582                  turned by ethtool -X ... context new.
583
584           vf N   Specifies  the  Virtual  Function the filter applies to. Not
585                  compatible with action.
586
587           queue N
588                  Specifies the Rx queue to send packets  to.  Not  compatible
589                  with action.
590
591           loc N  Specify  the location/ID to insert the rule. This will over‐
592                  write any rule present in that  location  and  will  not  go
593                  through any of the rule ordering process.
594
595           delete N
596                  Deletes the RX classification rule with the given ID.
597
598       -w --get-dump
599              Retrieves and prints firmware dump for the specified network de‐
600              vice.  By default, it prints out  the  dump  flag,  version  and
601              length  of  the dump data.  When data is indicated, then ethtool
602              fetches the dump data and directs it to a file.
603
604       -W --set-dump
605              Sets the dump flag for the device.
606
607       -T --show-time-stamping
608              Show the device's time stamping capabilities and associated  PTP
609              hardware clock.
610
611       -x --show-rxfh-indir --show-rxfh
612              Retrieves  the  receive  flow  hash indirection table and/or RSS
613              hash key.
614
615       -X --set-rxfh-indir --rxfh
616              Configures the receive flow hash indirection  table  and/or  RSS
617              hash key.
618
619           hkey   Sets  RSS hash key of the specified network device. RSS hash
620                  key should be of device supported length.  Hash  key  format
621                  must be in xx:yy:zz:aa:bb:cc format meaning both the nibbles
622                  of a byte should be mentioned even if a nibble is zero.
623
624           hfunc  Sets RSS hash function  of  the  specified  network  device.
625                  List of RSS hash functions which kernel supports is shown as
626                  a part of the --show-rxfh command output.
627
628           equal N
629                  Sets the receive flow hash indirection table to spread flows
630                  evenly between the first N receive queues.
631
632           weight W0 W1 ...
633                  Sets the receive flow hash indirection table to spread flows
634                  between receive queues according to the given weights.   The
635                  sum  of the weights must be non-zero and must not exceed the
636                  size of the indirection table.
637
638           default
639                  Sets the receive flow hash indirection table to its  default
640                  value.
641
642           context CTX | new
643                  Specifies an RSS context to act on; either new to allocate a
644                  new RSS context, or CTX, a  value  returned  by  a  previous
645                  ... context new.
646
647           delete Delete  the specified RSS context.  May only be used in con‐
648                  junction with context and a non-zero CTX value.
649
650       -f --flash
651              Write a firmware image to flash or other non-volatile memory  on
652              the device.
653
654           file   Specifies  the filename of the firmware image.  The firmware
655                  must first be installed in one of the directories where  the
656                  kernel  firmware loader or firmware agent will look, such as
657                  /lib/firmware.
658
659           N      If the device stores multiple firmware  images  in  separate
660                  regions  of  non-volatile memory, this parameter may be used
661                  to specify which region is to be written.  The default is 0,
662                  requesting  that  all regions are written.  All other values
663                  are driver-dependent.
664
665       -l --show-channels
666              Queries the specified network device for the numbers of channels
667              it  has.   A  channel  is  an IRQ and the set of queues that can
668              trigger that IRQ.
669
670       -L --set-channels
671              Changes the numbers of channels of the specified network device.
672
673           rx N   Changes the number of channels with only receive queues.
674
675           tx N   Changes the number of channels with only transmit queues.
676
677           other N
678                  Changes the number of channels used only for other  purposes
679                  e.g. link interrupts or SR-IOV co-ordination.
680
681           combined N
682                  Changes the number of multi-purpose channels.
683
684       -m --dump-module-eeprom --module-info
685              Retrieves  and  if  possible decodes the EEPROM from plugin mod‐
686              ules, e.g SFP+, QSFP.  If the driver and module support it,  the
687              optical diagnostic information is also read and decoded.
688
689       --show-priv-flags
690              Queries the specified network device for its private flags.  The
691              names and meanings of private flags (if any) are defined by each
692              network device driver.
693
694       --set-priv-flags
695              Sets the device's private flags as specified.
696
697           flag on|off Sets the state of the named private flag.
698
699       --show-eee
700              Queries  the specified network device for its support of Energy-
701              Efficient Ethernet (according to  the  IEEE  802.3az  specifica‐
702              tions)
703
704       --set-eee
705              Sets the device EEE behaviour.
706
707           eee on|off
708                  Enables/disables the device support of EEE.
709
710           tx-lpi on|off
711                  Determines whether the device should assert its Tx LPI.
712
713           advertise N
714                  Sets  the  speeds  for which the device should advertise EEE
715                  capabilities.  Values are as for --change advertise
716
717           tx-timer N
718                  Sets the amount of time the device should stay in idle  mode
719                  prior  to  asserting  its Tx LPI (in microseconds). This has
720                  meaning only when Tx LPI is enabled.
721
722       --set-phy-tunable
723              Sets the PHY tunable parameters.
724
725           downshift on|off
726                  Specifies whether downshift should be enabled
727
728                  count N
729                  Sets the PHY downshift re-tries count.
730
731       --get-phy-tunable
732              Gets the PHY tunable parameters.
733
734           downshift
735                  For operation in cabling environments that are  incompatible
736                  with 1000BASE-T, PHY device provides an automatic link speed
737                  downshift operation.  Link speed downshift  after  N  failed
738                  1000BASE-T  auto-negotiation  attempts.  Downshift is useful
739                  where cable does not have the 4 pairs instance.
740
741                  Gets the PHY downshift count/status.
742
743       --reset
744              Reset hardware components  specified  by  flags  and  components
745              listed below
746
747           flags N
748                  Resets the components based on direct flags mask
749
750           mgmt   Management processor
751
752           irq    Interrupt requester
753
754           dma    DMA engine
755
756           filter Filtering/flow direction
757
758           offload
759                  Protocol offload
760
761           mac    Media access controller
762
763           phy    Transceiver/PHY
764
765           ram    RAM  shared  between multiple components ap Application Pro‐
766                  cessor
767
768           dedicated
769                  All components dedicated to this interface
770
771           all    All components used by this interface, even if shared
772
773       --show-fec
774              Queries the specified network device for its support of  Forward
775              Error Correction.
776
777       --set-fec
778              Configures  Forward  Error  Correction for the specified network
779              device.
780
781              Forward Error Correction modes selected by a user  are  expected
782              to be persisted after any hotplug events. If a module is swapped
783              that does not support  the  current  FEC  mode,  the  driver  or
784              firmware must take the link down administratively and report the
785              problem in the system logs for users to correct.
786
787           encoding auto|off|rs|baser [...]
788
789                  Sets the FEC encoding for the device.  Combinations  of  op‐
790                  tions  are  specified as e.g.  encoding auto rs ; the seman‐
791                  tics of such combinations vary between drivers.
792
793                  auto    Use the driver's default encoding
794                  off     Turn off FEC
795                  RS      Force RS-FEC encoding
796                  BaseR   Force BaseR encoding
797

BUGS

799       Not supported (in part or whole) on all network drivers.
800

AUTHOR

802       ethtool was written by David Miller.
803
804       Modifications by Jeff Garzik, Tim Hockin, Jakub Jelinek, Andre Majorel,
805       Eli  Kupermann,  Scott  Feldman,  Andi  Kleen, Alexander Duyck, Sucheta
806       Chakraborty, Jesse Brandeburg, Ben Hutchings, Scott Branden.
807

AVAILABILITY

809       ethtool                is                available                 from
810http://www.kernel.org/pub/software/network/ethtool/
811
812
813
814Ethtool version 5.0               March 2019                        ETHTOOL(8)
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