linux-kernel - Re: [PATCH net-next 1/3] ethtool: Add 100base-FX link mode entries

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Message-ID: <bfe1a5fa-2092-7aa8-db24-86306042d3fc@ti.com>
Date:   Tue, 15 Sep 2020 18:26:34 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <f.fainelli@...il.com>,
        <hkallweit1@...il.com>, <mkubecek@...e.cz>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] ethtool: Add 100base-FX link mode entries

Andrew

On 9/15/20 3:10 PM, Andrew Lunn wrote:
> On Tue, Sep 15, 2020 at 01:17:06PM -0500, Dan Murphy wrote:
>> @@ -160,6 +160,8 @@ static const struct phy_setting settings[] = {
>>   	PHY_SETTING(    100, FULL,    100baseT_Full		),
>>   	PHY_SETTING(    100, FULL,    100baseT1_Full		),
>>   	PHY_SETTING(    100, HALF,    100baseT_Half		),
>> +	PHY_SETTING(    100, HALF,    100baseFX_Half		),
>> +	PHY_SETTING(    100, FULL,    100baseFX_Full		),
> Hi Dan
>
> Does 100baseFX_Half make an sense? My understanding of 802.3 section
> 26 is that it is always a pair, not a single fibre where you might
> need CSMA/CD?

I actually questioned that too and looked it up

I found these and thought they could be viable

http://www.certiology.com/tech-terms/network/100base-fx.html

"The 100Base-FX can be used in a maximum length of 412 meters if being 
used in

half-duplex connections or as 2 kilometer lengths in the case of 
full-duplex transmissions over optical fiber."

https://www.cnet.com/products/half-duplex-100basefx-interface-pb7/

Of course I never have seen one myself

Dan


>     Andrew