netdev - Re: [RFC net-next 2/5] net: phylink: add separate pcs operations structure

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Message-ID: <20200317163802.GZ24270@lunn.ch>
Date:   Tue, 17 Mar 2020 17:38:02 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC net-next 2/5] net: phylink: add separate pcs operations
 structure

On Tue, Mar 17, 2020 at 02:52:51PM +0000, Russell King wrote:
> *NOT FOR MERGING*
> 
> Add a separate set of PCS operations, which MAC drivers can use to
> couple phylink with their associated MAC PCS layer.  The PCS
> operations include:
> 
> - pcs_get_state() - reads the link up/down, resolved speed, duplex
>    and pause from the PCS.
> - pcs_config() - configures the PCS for the specified mode, PHY
>    interface type, and setting the advertisement.
> - pcs_an_restart() - restarts 802.3 in-band negotiation with the
>    link partner
> - pcs_link_up() - informs the PCS that link has come up, and the
>    parameters of the link. Link parameters are used to program the
>    PCS for fixed speed and non-inband modes.

Hi Russell

This API makes sense. But it seems quite common to have multiple
PCS's. Rather than have MAC drivers implement their own mux, i wonder
if there should be core support? Or at least a library to help the
implementation?

	Andrew