[PATCH net-next v6 06/14] net: phy: Introduce generic SFP handling for PHY drivers

[Romain Gantois]

On Thursday, 29 May 2025 15:23:22 CEST Russell King (Oracle) wrote:
> On Wed, May 28, 2025 at 09:35:35AM +0200, Romain Gantois wrote:
> > > In that regard, you can consider 1000BaseX as a MII mode (we do have
> > > PHY_INTERFACE_MODE_1000BASEX).
> > 
> > Ugh, the "1000BaseX" terminology never ceases to confuse me, but yes
> > you're
> > right.
> 
> 1000BASE-X is exactly what is described in IEEE 802.3. It's a PHY
> interface mode because PHYs that use SerDes can connect to the host
> using SGMII or 1000BASE-X over the serial link.
> 
> 1000BASE-X's purpose in IEEE 802.3 is as a protocol for use over
> fibre links, as the basis for 1000BASE-SX, 1000BASE-LX, 1000BASE-EX
> etc where the S, L, E etc are all to do with the properties of the
> medium that the electrical 1000BASE-X is sent over. It even includes
> 1000BASE-CX which is over copper cable.

Ah makes sense, thanks for the explanation. I guess my mistake was assuming 
that MAC/PHY interface modes were necessarily strictly at the reconciliation 
sublayer level, and didn't include PCS/PMA functions.

Thanks,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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