netdev - Re: [EXT] Re: Phylink flow control support on ports with MLO_AN

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Message-ID: <YCq65/83SnpgyA86@lunn.ch>
Date:   Mon, 15 Feb 2021 19:18:15 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Stefan Chulski <stefanc@...vell.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Marcin Wojtas (mw@...ihalf.com)" <mw@...ihalf.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>
Subject: Re: [EXT] Re: Phylink flow control support on ports with
 MLO_AN_FIXED auto negotiation

On Mon, Feb 15, 2021 at 04:19:19PM +0000, Stefan Chulski wrote:
> > > > I discussed it with Andrew earlier last year, and his response was:
> > > >
> > > >  DT configuration of pause for fixed link probably is sufficient. I
> > > > don't  remember it ever been really discussed for DSA. It was a
> > > > Melanox  discussion about limiting pause for the CPU. So I think it
> > > > is safe to  not implement ethtool -A, at least until somebody has a
> > > > real use case  for it.
> > > >
> > > > So I chose not to support it - no point supporting features that
> > > > people aren't using. If you have a "real use case" then it can be added.
> > >
> > > This patch may be sufficient - I haven't fully considered all the
> > > implications of changing this though.
> > 
> > Did you try this patch? What's the outcome?
> 
> For me patch worked as expected.

Hi Stefan

Russell's patch allows it, but i would be interested in knows why you
actually need it. What is your use case for changing this on the fly?

	 Andrew