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        Vladimir Oltean <olteanv@gmail.com>
Cc:     "Russell King (Oracle)" <linux@armlinux.org.uk>,
        Madalin Bucur <madalin.bucur@nxp.com>,
        Andrew Lunn <andrew@lunn.ch>,
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From:   Hauke Mehrtens <hauke@hauke-m.de>
Subject: Re: What is inside GPON SFP module? (Was: Re: Unsupported
 phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts)
Message-ID: <80966478-8a7c-b66f-50b7-e50fc00b1784@hauke-m.de>
Date:   Sat, 5 Jun 2021 15:04:55 +0200
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From: Hauke Mehrtens <hauke@hauke-m.de>
To: =?UTF-8?Q?Pali_Roh=c3=a1r?= <pali@kernel.org>,
 Vladimir Oltean <olteanv@gmail.com>
Cc: "Russell King (Oracle)" <linux@armlinux.org.uk>,
 Madalin Bucur <madalin.bucur@nxp.com>, Andrew Lunn <andrew@lunn.ch>,
 Igal Liberman <Igal.Liberman@freescale.com>,
 Shruti Kanetkar <Shruti@freescale.com>,
 Emil Medve <Emilian.Medve@freescale.com>, Scott Wood <oss@buserror.net>,
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 "Camelia Alexandra Groza (OSS)" <camelia.groza@oss.nxp.com>
Message-ID: <80966478-8a7c-b66f-50b7-e50fc00b1784@hauke-m.de>
Subject: Re: What is inside GPON SFP module? (Was: Re: Unsupported
 phy-connection-type sgmii-2500 in arch/powerpc/boot/dts/fsl/t1023rdb.dts)
References: <YLjxX/XPDoRRIvYf@lunn.ch> <20210603194853.ngz4jdso3kfncnj4@pali>
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On 6/5/21 2:50 PM, Pali Roh=C3=A1r wrote:
> On Saturday 05 June 2021 15:26:39 Vladimir Oltean wrote:
>> On Sat, Jun 05, 2021 at 01:33:07AM +0100, Russell King (Oracle) wrote:=

>>> It started out as described - literally, 1000base-X multiplied by 2.5=
x.
>>> There are setups where that is known to work - namely GPON SFPs that
>>> support 2500base-X. What that means is that we know the GPON SFP
>>> module negotiates in-band AN with 2500base-X. However, we don't know
>>> whether the module will work if we disable in-band AN.
>>
>> Pardon my ignorance, but what is inside a GPON ONT module? Just a lase=
r
>> and some amplifiers? So it would still be the MAC PCS negotiating flow=

>> control with the remote link partner? That's a different use case from=20
a
>> PHY transmitting the negotiated link modes to the MAC.
>=20
> Hello Vladimir! All GPON ONU/ONT SFP modules which I have tested, are
> fully featured mini computers. It is some SoC with powerful CPU, fiber
> part, at least two NICs and then two phys, one for fiber part and one
> for "SFP"-part (in most cases 1000base-x or 2500base-x). On SoC inside
> is running fully featured operating system, in most cases Linux kernel
> 2.6.3x and tons of userspace applications which implements "application=
"
> layer of GPON protocol -- the most important part. If OEM vendor of GPO=
N
> SFP stick did not locked it, you can connect to this "computer" via
> telnet or web browser and configure some settings, including GPON stuff=

> and also how GPON network is connected to SFP part -- e.g. it can be
> fully featured IPv4 router with NAT or just plain bridge mode where
> "ethernet data packets" (those which are not part of ISP configuration
> protocol) are pass-throw to SFP phy 1000base-x to host CPU. GPON is not=

> ethernet, it is some incompatible and heavily layered extension on ATM.=

> Originally I thought that ATM is long ago dead (as I saw it in used las=
t
> time in ADSL2) but it is still alive and cause issues... I think it doe=
s
> not use 8b/10b encoding and therefore cannot be directly mapped to
> 1000base-x. Also GPON uses different wavelengths for inbound and
> outbound traffic. And to make it even more complicated it uses totally
> nonstandard asynchronous speeds, inbound is 2488.32Mbit/s, outbound is
> 1244.16Mbit/s. So I guess CPU/SoC with GPON support (something which is=

> inside that GPON ONU/ONT stick) must use totally different modes for
> which we do not have any option in DTS yet.
>=20
> So once mainline kernel will support these "computers" with GPON suppor=
t
> it would be required to define new kind of phy modes... But I do not
> think it happens and all OEM vendors are using 2.6.3x kernels their
> userspace GPON implementation is closed has tons of secrets.
>=20

Hi,

This description of the GPON SFP sticks is correct, but it misses some=20
of the complexity. ;-) GPON is also a shared medium like DOCSIS, you can =

not always send, but you have to wait till you get your time slice over=20
PLOAM.
In addition the GPON SFP stick also have to talk the OMCI protocol which =

allows to operator to configure all sorts of layer 2 things. They can=20
also login to your SFP stick. ;-)
There are also some passive GPON SFP sticks which just translate between =

electrical and optical signals, but to operate them you need a GPON MAC=20
and managed layer on your host.

Adding GPON support properly into Linux is not an easy task, Linux would =

probably need a subsystem with a complexity compared to cfg80211 + hostap=
d.

Is there a list of things these GPON sticks running Linux should do=20
better in the future? For example what to avoid in the EEPROM emulation=20
handling?

Hauke

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