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Date: Wed, 11 Mar 2020 11:44:33 -0500
From: Chris Preimesberger <ccpisme@...il.com>
To: linville@...driver.com, netdev@...r.kernel.org
Subject: ethtool -m bug: transceiver made for fiber is misreported as
supporting copper
Hello,
I noticed a problem of fiber optic transceiver OM4 distance ratings
being mis-reported as copper distance when using ethtool v5.4, and I
thing the root cause is an ethtool bug. Can this be fixed so that
ethtool reports "Length (OM4)" in meters while fiber optic
transceivers are installed, and "Length (Copper)" in meters while
copper transceivers are installed? Thank you.
Here's more info:
According to SFF-8472 rev 12.3, Table 4-1:
A0h 18, Byte 1 is dedicated to indicating the supported length of
either 50µm OM4 fiber cable, or copper cable, with this description:
“
Link length supported for 50um OM4 fiber, units of 10m.
Alternatively copper or direct attach cable, units of m
“
Below is a CLI transcript showing the problem; ethtool incorrectly
indicates that a fiber optic transceiver rated for up to 100m of OM4
fiber is made for up to 10m of copper:
tech1@E13:~$ ethtool --version
ethtool version 5.4
tech1@E13:~$ sudo ethtool -m enp3s0f1
Identifier : 0x03 (SFP)
Extended identifier : 0x04
(GBIC/SFP defined by 2-wire interface ID)
Connector : 0x07 (LC)
Transceiver codes : 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x02
Transceiver type : Extended:
100G Base-SR4 or 25GBase-SR
Encoding : 0x06 (64B/66B)
BR, Nominal : 26000MBd
Rate identifier : 0x00 (unspecified)
Length (SMF,km) : 0km
Length (SMF) : 0m
Length (50um) : 100m
Length (62.5um) : 100m
Length (Copper) : 10m
Length (OM3) : 70m
Laser wavelength : 850nm
Vendor name : FS
Vendor OUI : 00:17:6a
Vendor PN : SFP28-25GSR-85
Vendor rev : 01
Option values : 0x08 0x1a
Option : RX_LOS implemented
Option : TX_FAULT implemented
Option : TX_DISABLE
implemented
Option : Retimer or
CDR implemented
BR margin, max : 0%
BR margin, min : 0%
Vendor SN : G1907043057
Date code : 190922
Optical diagnostics support : Yes
Laser bias current : 6.104 mA
Laser output power : 1.5198 mW / 1.82 dBm
Receiver signal average optical power : 1.4392 mW / 1.58 dBm
Module temperature : 41.52
degrees C / 106.74 degrees F
Module voltage : 3.3840 V
Alarm/warning flags implemented : Yes
Laser bias current high alarm : Off
Laser bias current low alarm : Off
Laser bias current high warning : Off
Laser bias current low warning : Off
Laser output power high alarm : Off
Laser output power low alarm : Off
Laser output power high warning : Off
Laser output power low warning : Off
Module temperature high alarm : Off
Module temperature low alarm : Off
Module temperature high warning : Off
Module temperature low warning : Off
Module voltage high alarm : Off
Module voltage low alarm : Off
Module voltage high warning : Off
Module voltage low warning : Off
Laser rx power high alarm : Off
Laser rx power low alarm : Off
Laser rx power high warning : Off
Laser rx power low warning : Off
Laser bias current high alarm threshold : 11.000 mA
Laser bias current low alarm threshold : 2.000 mA
Laser bias current high warning threshold : 10.000 mA
Laser bias current low warning threshold : 3.000 mA
Laser output power high alarm threshold : 2.2387 mW / 3.50 dBm
Laser output power low alarm threshold : 0.1258 mW
/ -9.00 dBm
Laser output power high warning threshold : 2.0000 mW / 3.01 dBm
Laser output power low warning threshold : 0.1737 mW
/ -7.60 dBm
Module temperature high alarm threshold : 80.00
degrees C / 176.00 degrees F
Module temperature low alarm threshold : -10.00
degrees C / 14.00 degrees F
Module temperature high warning threshold : 70.00
degrees C / 158.00 degrees F
Module temperature low warning threshold : 0.00
degrees C / 32.00 degrees F
Module voltage high alarm threshold : 3.6000 V
Module voltage low alarm threshold : 3.0000 V
Module voltage high warning threshold : 3.5000 V
Module voltage low warning threshold : 3.1000 V
Laser rx power high alarm threshold : 2.2387 mW / 3.50 dBm
Laser rx power low alarm threshold : 0.0630 mW
/ -12.01 dBm
Laser rx power high warning threshold : 2.0000 mW / 3.01 dBm
Laser rx power low warning threshold : 0.0870 mW
/ -10.60 dBm
tech1@E13:~$ sudo ethtool -m enp3s0f1 hex on
Offset Values
------ ------
0x0000: 03 04 07 00 00 00 00 00 00 00 00 06 ff 00 00 00
0x0010: 0a 0a 0a 07 46 53 20 20 20 20 20 20 20 20 20 20
0x0020: 20 20 20 20 02 00 17 6a 53 46 50 32 38 2d 32 35
0x0030: 47 53 52 2d 38 35 20 20 30 31 20 20 03 52 00 b7
0x0040: 08 1a 68 00 47 31 39 30 37 30 34 33 30 35 37 20
0x0050: 20 20 20 20 31 39 30 39 32 32 20 20 68 fa 08 56
0x0060: 00 00 11 cc 89 48 9f a4 5a 30 d2 72 a0 2d 5c fe
0x0070: 4d b0 fe 00 00 00 00 00 00 00 00 00 09 18 d7 8f
0x0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0100: 50 00 f6 00 46 00 00 00 8c a0 75 30 88 b8 79 18
0x0110: 15 7c 03 e8 13 88 05 dc 57 73 04 ea 4e 20 06 c9
0x0120: 57 73 02 76 4e 20 03 66 00 00 00 00 00 00 00 00
0x0130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0140: 00 00 00 00 3f 80 00 00 00 00 00 00 01 00 00 00
0x0150: 01 00 00 00 01 00 00 00 01 00 00 00 00 00 00 f7
0x0160: 29 64 84 30 0b ec 3a ee 38 38 00 00 00 00 30 00
0x0170: 00 00 82 25 00 00 00 00 00 00 00 00 00 00 00 00
0x0180: 43 4d 55 49 41 52 41 43 41 41 31 30 2d 33 32 32
0x0190: 37 2d 30 31 56 30 31 20 01 00 46 00 00 00 00 cf
0x01a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x01b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x01c0: 53 46 50 2d 32 35 47 2d 53 52 2d 53 20 20 20 20
0x01d0: 20 20 20 20 30 34 00 00 00 00 00 00 00 00 00 7a
0x01e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x01f0: 00 00 00 00 00 00 00 00 ff ff ff ff 00 00 00 00
tech1@E13:~$
If you have any questions, or need more info, please ask. Thank you!!
--
Best regards,
Chris Preimesberger
Otsego, MN
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