netdev - [drivers/net/phy/sfp] intermittent failure in state machine checks

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Date:   Thu, 9 Jan 2020 13:47:31 +0000
From:   ѽ҉ᶬḳ℠ <vtol@....net>
To:     netdev@...r.kernel.org
Subject: [drivers/net/phy/sfp] intermittent failure in state machine checks

On node with 4.19.93 and a SFP module (specs at the bottom) the 
following is intermittently observed:

libphy: SFP I2C Bus: probed
sfp sfp: module ALLNET ALL4781 rev V3.4 sn 0000000FC9157640 dc 29-03-18
sfp sfp: unknown connector, encoding 8b10b, nominal bitrate 1.3Gbps +0% -0%
sfp sfp: 1000BaseSX+ 1000BaseLX- 1000BaseCX- 1000BaseT- 100BaseTLX- 
1000BaseFX- BaseBX10- BasePX-
sfp sfp: 10GBaseSR- 10GBaseLR- 10GBaseLRM- 10GBaseER-
sfp sfp: Wavelength 0nm, fiber lengths:
sfp sfp: 9µm SM : unsupported
sfp sfp: 62.5µm MM OM1: unsupported/unspecified
sfp sfp: 50µm MM OM2: unsupported/unspecified
sfp sfp: 50µm MM OM3: unsupported/unspecified
sfp sfp: 50µm MM OM4: 2.540km
sfp sfp: Options: retimer
sfp sfp: Diagnostics:
sfp sfp: module transmit fault indicated
sfp sfp: module transmit fault recovered
sfp sfp: module transmit fault indicated
sfp sfp: module persistently indicates fault, disabling

To my humble understanding that pertains to checks in state machine

- SFP_S_WAIT_LOS
- SFP_S_LINK_UP

being done via the I2C | SM bus but it is not clear to me what causes 
the check to fail and how to remedy it.

____
SFP module specs

Identifier                                : 0x03 (SFP)
Extended identifier                       : 0x04 (GBIC/SFP defined by 
2-wire interface ID)
Connector                                 : 0x22 (RJ45)
Transceiver codes                         : 0x00 0x00 0x00 0x01 0x00 
0x00 0x00 0x00 0x00
Transceiver type                          : Ethernet: 1000BASE-SX
Encoding                                  : 0x01 (8B/10B)
BR, Nominal                               : 1300MBd
Rate identifier                           : 0x00 (unspecified)
Length (SMF,km)                           : 0km
Length (SMF)                              : 0m
Length (50um)                             : 0m
Length (62.5um)                           : 0m
Length (Copper)                           : 255m
Length (OM3)                              : 0m
Laser wavelength                          : 0nm
Vendor name                               : ALLNET
Vendor OUI                                : 00:0f:c9
Vendor PN                                 : ALL4781
Vendor rev                                : V3.4
Option values                             : 0x08 0x00
Option                                    : Retimer or CDR implemented
BR margin, max                            : 0%
BR margin, min                            : 0%