linux-kernel - Re: [PATCH net-next] net: sfp: add 2500base-X quirk for Lantech SFP module

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Date:   Tue, 15 Mar 2022 09:30:06 +0100
From:   Michael Walle <michael@...le.cc>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next] net: sfp: add 2500base-X quirk for Lantech SFP
 module

Am 2022-03-15 06:07, schrieb Jakub Kicinski:
> On Sat, 12 Mar 2022 21:50:14 +0100 Michael Walle wrote:
>> The Lantech 8330-262D-E module is 2500base-X capable, but it reports 
>> the
>> nominal bitrate as 2500MBd instead of 3125MBd. Add a quirk for the
>> module.
>> 
>> The following in an EEPROM dump of such a SFP with the serial number
>> redacted:
>> 
>> 00: 03 04 07 00 00 00 01 20 40 0c 05 01 19 00 00 00    ???...? 
>> @????...
>> 10: 1e 0f 00 00 4c 61 6e 74 65 63 68 20 20 20 20 20    ??..Lantech
>> 20: 20 20 20 20 00 00 00 00 38 33 33 30 2d 32 36 32        
>> ....8330-262
>> 30: 44 2d 45 20 20 20 20 20 56 31 2e 30 03 52 00 cb    D-E     
>> V1.0?R.?
>> 40: 00 1a 00 00 46 43 XX XX XX XX XX XX XX XX XX XX    
>> .?..FCXXXXXXXXXX
>> 50: 20 20 20 20 32 32 30 32 31 34 20 20 68 b0 01 98        220214  
>> h???
>> 60: 45 58 54 52 45 4d 45 4c 59 20 43 4f 4d 50 41 54    EXTREMELY 
>> COMPAT
>> 70: 49 42 4c 45 20 20 20 20 20 20 20 20 20 20 20 20    IBLE
> 
> Any idea what the "Extremely Compatible" is referring to? :-D

Haha, I smirked on that, too. Anything between 60 and 7f
is vendor specific. So.. good for a laugh?

>> Signed-off-by: Michael Walle <michael@...le.cc>
> 
> A quirk like this seems safe to apply to net and 5.17, still.
> Would you prefer that or net-next as marked?

Personally, I don't have any preference because the board
is just in the process of being upstreamed. Just pick one ;)
I'd say net-next because 5.17 development is almost at the
end.

-michael