【微知】如何查看Mellanox网卡上的光模块的信息？（ethtool -m enp1s0f0 看型号、厂商、生产日期等）

背景

服务器上插入的光模块经常被忽略，往往这里是定位问题最根本的地方。如何通过命令查看？

命令

ethtool提供了-m参数，m是module-info的意思，他是从光模块的eeprom中读取数据。（应该是用i2c协议读取的）

ethtool -m enp1s0f0

实操

本文实操2种光模块插在同一个设备上（设备是CX5 25G）。
一个是1G的千兆SFP光模块
另一个是25G的SFP28的光模块

SFP和SFP28的区别参考兄弟篇：https://blog.csdn.net/essencelite/article/details/138551156

25G 光模块信息

[root@localhost ~]# ethtool -m enp1s0f0Identifier                                : 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 0x02Transceiver type                          : Extended: 100G Base-SR4 or 25GBase-SREncoding                                  : 0x03 (NRZ)BR, Nominal                               : 25750MBdRate identifier                           : 0x00 (unspecified)Length (SMF,km)                           : 0kmLength (SMF)                              : 0mLength (50um)                             : 0mLength (62.5um)                           : 0mLength (Copper)                           : 10mLength (OM3)                              : 70mLaser wavelength                          : 850nmVendor name                               : DTZVendor OUI                                : 44:7c:7fVendor PN                                 : SFP28-25G-SRVendor rev                                : 1AOption values                             : 0x00 0x1aOption                                    : RX_LOS implementedOption                                    : TX_FAULT implementedOption                                    : TX_DISABLE implementedBR margin, max                            : 0%BR margin, min                            : 0%Vendor SN                                 : 2312280516Date code                                 : 231228Optical diagnostics support               : YesLaser bias current                        : 7.000 mALaser output power                        : 0.6205 mW / -2.07 dBmReceiver signal average optical power     : 1.0533 mW / 0.23 dBmModule temperature                        : 33.24 degrees C / 91.83 degrees FModule voltage                            : 3.2922 VAlarm/warning flags implemented           : YesLaser bias current high alarm             : OffLaser bias current low alarm              : OffLaser bias current high warning           : OffLaser bias current low warning            : OffLaser output power high alarm             : OffLaser output power low alarm              : OffLaser output power high warning           : OffLaser output power low warning            : OffModule temperature high alarm             : OffModule temperature low alarm              : OffModule temperature high warning           : OffModule temperature low warning            : OffModule voltage high alarm                 : OffModule voltage low alarm                  : OffModule voltage high warning               : OffModule voltage low warning                : OffLaser rx power high alarm                 : OffLaser rx power low alarm                  : OffLaser rx power high warning               : OffLaser rx power low warning                : OffLaser bias current high alarm threshold   : 15.000 mALaser bias current low alarm threshold    : 0.000 mALaser bias current high warning threshold : 15.000 mALaser bias current low warning threshold  : 0.000 mALaser output power high alarm threshold   : 3.4674 mW / 5.40 dBmLaser output power low alarm threshold    : 0.0724 mW / -11.40 dBmLaser output power high warning threshold : 1.7378 mW / 2.40 dBmLaser output power low warning threshold  : 0.1445 mW / -8.40 dBmModule temperature high alarm threshold   : 75.00 degrees C / 167.00 degrees FModule temperature low alarm threshold    : -5.00 degrees C / 23.00 degrees FModule temperature high warning threshold : 73.00 degrees C / 163.40 degrees FModule temperature low warning threshold  : -3.00 degrees C / 26.60 degrees FModule voltage high alarm threshold       : 3.6300 VModule voltage low alarm threshold        : 2.9700 VModule voltage high warning threshold     : 3.4650 VModule voltage low warning threshold      : 3.1350 VLaser rx power high alarm threshold       : 3.4674 mW / 5.40 dBmLaser rx power low alarm threshold        : 0.0468 mW / -13.30 dBmLaser rx power high warning threshold     : 1.7378 mW / 2.40 dBmLaser rx power low warning threshold      : 0.0933 mW / -10.30 dBm

千兆光模块信息

[root@localhost ~]# ethtool -m enp1s0f0Identifier                                : 0x03 (SFP)Extended identifier                       : 0x04 (GBIC/SFP defined by 2-wire interface ID)Connector                                 : 0x07 (LC)Transceiver codes                         : 0x00 0x00 0x00 0x01 0x20 0x40 0x0c 0x05 0x00Transceiver type                          : Ethernet: 1000BASE-SXTransceiver type                          : FC: intermediate distance (I)Transceiver type                          : FC: Shortwave laser w/o OFC (SN)Transceiver type                          : FC: Multimode, 62.5um (M6)Transceiver type                          : FC: Multimode, 50um (M5)Transceiver type                          : FC: 200 MBytes/secTransceiver type                          : FC: 100 MBytes/secEncoding                                  : 0x01 (8B/10B)BR, Nominal                               : 1300MBdRate identifier                           : 0x00 (unspecified)Length (SMF,km)                           : 0kmLength (SMF)                              : 0mLength (50um)                             : 80mLength (62.5um)                           : 30mLength (Copper)                           : 0mLength (OM3)                              : 300mLaser wavelength                          : 850nmVendor name                               : OEMVendor OUI                                : 00:1b:21Vendor PN                                 : SFP-G-TVendor rev                                : AOption values                             : 0x00 0x12Option                                    : RX_LOS implementedOption                                    : TX_DISABLE implementedBR margin, max                            : 0%BR margin, min                            : 0%Vendor SN                                 : HYBG000001Date code                                 : 240401Optical diagnostics support               : YesLaser bias current                        : 6.000 mALaser output power                        : 0.5000 mW / -3.01 dBmReceiver signal average optical power     : 0.4098 mW / -3.87 dBmModule temperature                        : 24.25 degrees C / 75.65 degrees FModule voltage                            : 3.3725 VAlarm/warning flags implemented           : YesLaser bias current high alarm             : OffLaser bias current low alarm              : OffLaser bias current high warning           : OffLaser bias current low warning            : OffLaser output power high alarm             : OffLaser output power low alarm              : OffLaser output power high warning           : OffLaser output power low warning            : OffModule temperature high alarm             : OffModule temperature low alarm              : OffModule temperature high warning           : OffModule temperature low warning            : OffModule voltage high alarm                 : OffModule voltage low alarm                  : OffModule voltage high warning               : OffModule voltage low warning                : OffLaser rx power high alarm                 : OffLaser rx power low alarm                  : OffLaser rx power high warning               : OffLaser rx power low warning                : OffLaser bias current high alarm threshold   : 15.000 mALaser bias current low alarm threshold    : 1.000 mALaser bias current high warning threshold : 13.000 mALaser bias current low warning threshold  : 2.000 mALaser output power high alarm threshold   : 1.9952 mW / 3.00 dBmLaser output power low alarm threshold    : 0.1584 mW / -8.00 dBmLaser output power high warning threshold : 1.5848 mW / 2.00 dBmLaser output power low warning threshold  : 0.1778 mW / -7.50 dBmModule temperature high alarm threshold   : 95.00 degrees C / 203.00 degrees FModule temperature low alarm threshold    : -45.00 degrees C / -49.00 degrees FModule temperature high warning threshold : 85.00 degrees C / 185.00 degrees FModule temperature low warning threshold  : -40.00 degrees C / -40.00 degrees FModule voltage high alarm threshold       : 3.6000 VModule voltage low alarm threshold        : 3.0000 VModule voltage high warning threshold     : 3.5000 VModule voltage low warning threshold      : 3.1000 VLaser rx power high alarm threshold       : 1.1220 mW / 0.50 dBmLaser rx power low alarm threshold        : 0.0199 mW / -17.01 dBmLaser rx power high warning threshold     : 1.0000 mW / 0.00 dBmLaser rx power low warning threshold      : 0.0223 mW / -16.52 dBm

关键信息分析

Identifier 查看型号，这里主要25G和1G是相同的，会决定外形和引脚
Identifier : 0x03 (SFP)
Connector: 使用 LC（Lucent Connector）光纤连接器。（Lucent /ˈluːsnt/ adj.透明的，光亮的；）
Connector : 0x07 (LC)
Transceiver type 可以看到支持的速率，可以看到光模块的速率型号
Transceiver type : Extended: 100G Base-SR4 or 25GBase-SR
Transceiver type : Ethernet: 1000BASE-SX
BR, Nominal 可以看到比特率（Bit Rate），这个直接决定相同引脚的速率
BR, Nominal : 25750MBd （可见是25.75G）
BR, Nominal : 1300MBd（可见是1.3G）
Laser wavelength 是光线的波长，850nm都是多模的，如果是1350nm是单模
Laser wavelength : 850nm
Vendor name 可以查看光模块的厂商，可以看到25G的是DTZ的和照片相同，另一个是OEM
Vendor name : DTZ
Vendor name : OEM
Vendor PN 厂商的产品序号，这个一定程度标注速率，25G、1G，
Vendor PN : SFP28-25G-SR
Vendor PN : SFP-G-T
Length (OM3): 在 OM3 多模光纤上，最大传输距离为 70 米。
Length (Copper) : 10m 同轴电缆最大10m
Date code 可以看到生产日期
Date code : 231228
Date code : 240401

可见，光模块型号、厂商、生产日期、速率、波长、比特率支持速率这些都能读取到。