From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Lunn <andrew@lunn.ch>
Subject: Re: Waiting for the PHY to complete auto-negotiation
Date: Wed, 6 Dec 2017 19:26:33 +0100
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Cc: netdev <netdev@vger.kernel.org>,
        Florian Fainelli <f.fainelli@gmail.com>,
        David Miller <davem@davemloft.net>
To: Mason <slash.tmp@free.fr>
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> The problem with this is the following mind-boggling quirk of
> the hardware: once RX DMA is enabled, there is no supported
> way to disable it! Thus, I'm trying to find a clean way to set
> the control flow parameter BEFORE enabling the MAC.

There is no solution. I can pull the cable out, and plug it into a
different computer. The first could use flow control, the second not.

If you cannot disable RX DMA, you should probably disable unloading of
the module. Also kexec.

    Andrew