netdev - Re: [RFC PATCH net-next 0/3] RTNL: Add link-down reason reporting

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Date:   Mon, 18 Mar 2019 12:11:17 +0000
From:   Petr Machata <petrm@...lanox.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Tariq Toukan <tariqt@...lanox.com>,
        "jakub.kicinski@...ronome.com" <jakub.kicinski@...ronome.com>,
        "stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [RFC PATCH net-next 0/3] RTNL: Add link-down reason reporting


Andrew Lunn <andrew@...n.ch> writes:

>> The party with visibility into details of this process is the driver.
>
> In the general case, i would disagree with this. It is the PHY layer
> which knows about these things. phylib and phylink. The MAC driver has
> no idea, it just sees that the carrier is off.
>
> There are however some drivers which do PHYs without using the Linux
> core code. But there are not so many of them. I would hope this code
> is designed for the general case, and can also be used by those that
> ignore the core code.
>
> Please could you explain how you see this being linked to phylib and
> phylink, without having to modify every MAC driver.

I'll take a look at how to make this work with the phy drivers. Thanks,
Petr