netdev - Re: [PATCH net-next 02/10] net: phy: phylink: allow 10GKR interface to use in-band negotiation

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Date:   Mon, 19 Mar 2018 14:10:09 +0100
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        davem@...emloft.net, kishon@...com, gregory.clement@...tlin.com,
        jason@...edaemon.net, sebastian.hesselbarth@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, maxime.chevallier@...tlin.com,
        miquel.raynal@...tlin.com, nadavh@...vell.com, stefanc@...vell.com,
        ymarkman@...vell.com, mw@...ihalf.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next 02/10] net: phy: phylink: allow 10GKR interface
 to use in-band negotiation

Hi Andrew,

On Mon, Mar 19, 2018 at 01:59:53PM +0100, Andrew Lunn wrote:
> 
> If they don't have PHYs, how are the connected to the outside world?

On 7k/8k you have the following scheme for 10G only interfaces:

   MAC -- Comphy -- PHY -- SFP cage -- ...

Or

   MAC -- Comphy -- SFP cage -- ...

The comphy provides serdes lanes, and can be configured in various
modes (SGMII, 2500SGMII, 10GKR...).

Antoine

-- 
Antoine Ténart, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com