netdev - Re: [PATCH net-next 4/7] net: pcs: xpcs: adapt Wangxun NICs for SGMII mode

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Message-ID: <be6b8423-0045-49bf-acfc-92ffa9028316@lunn.ch>
Date: Fri, 28 Jul 2023 12:24:03 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: "'Russell King (Oracle)'" <linux@...linux.org.uk>,
	netdev@...r.kernel.org, hkallweit1@...il.com,
	Jose.Abreu@...opsys.com, mengyuanlou@...-swift.com
Subject: Re: [PATCH net-next 4/7] net: pcs: xpcs: adapt Wangxun NICs for
 SGMII mode

> There is a question about I2C MII read ops. I see that PHY in SFP-RJ45 module
> is read by i2c_mii_read_default_c22(), but it limits the msgs[0].len=1.
> 
> A description in  the SFP-RJ45 datasheet shows:

Please give a link to this document.

The problem with copper PHYs embedded inside SFPs is that there is no
standardised protocol to talk to them. Each PHY vendor does their own
thing. At the moment, two different protocols are supported, ROLLBALL
and the default protocol. It might be another protocol needs to be
added to support the SFP you are testing with. So we need to see the
protocol specification.

      Andrew