netdev - Re: [PATCH v3 2/2] net: sfp: add mode quirk for GPON module Ubiquiti U-Fiber Instant

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Message-ID: <20210111163232.18e7edcb@kernel.org>
Date:   Mon, 11 Jan 2021 16:32:32 +0100
From:   Marek Behún <kabel@...nel.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Schreiber <tschreibe@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] net: sfp: add mode quirk for GPON module
 Ubiquiti U-Fiber Instant

On Mon, 11 Jan 2021 12:39:09 +0100
Pali Rohár <pali@...nel.org> wrote:

> SFP GPON module Ubiquiti U-Fiber Instant has in its EEPROM stored nonsense
> information. It claims that support all transceiver types including 10G
> Ethernet which is not truth. So clear all claimed modes and set only one
> mode which module supports: 1000baseX_Full.

The Ubiquiti U-Fiber Instant SFP GPON module has nonsensical
information stored in int EEPROM. It claims to support all transceiver
types including 10G Ethernet. Clear all claimed modes and set only
1000baseX_Full, which is the only one supported.

> Also this module have set SFF phys_id in its EEPROM. Kernel SFP subsustem
> currently does not allow to use SFP modules detected as SFF. Therefore add
> and exception for this module so it can be detected as supported.

This module has also phys_id set to SFF, and the SFP subsystem
currently does not allow to use SFP modules detected as SFFs. Add
exception for this module so it can be detected as supported.

> This change finally allows to detect and use SFP GPON module Ubiquiti
> U-Fiber Instant on Linux system.
>
> Original EEPROM content is as follows (where XX is serial number):
> 
> 00: 02 04 0b ff ff ff ff ff ff ff ff 03 0c 00 14 c8    ???........??.??
> 10: 00 00 00 00 55 42 4e 54 20 20 20 20 20 20 20 20    ....UBNT
> 20: 20 20 20 20 00 18 e8 29 55 46 2d 49 4e 53 54 41        .??)UF-INSTA
> 30: 4e 54 20 20 20 20 20 20 34 20 20 20 05 1e 00 36    NT      4   ??.6
> 40: 00 06 00 00 55 42 4e 54 XX XX XX XX XX XX XX XX    .?..UBNTXXXXXXXX
> 50: 20 20 20 20 31 34 30 31 32 33 20 20 60 80 02 41        140123  `??A