netdev - Re: [PATCH net-next v3 5/5] net: ethernet: cortina: Implement .set

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Message-ID: <CACRpkdZnhH=OvivSK0=e_NUEB3M--v+MawjuZZOPNoRCWn1NhA@mail.gmail.com>
Date: Tue, 14 May 2024 10:55:18 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Hans Ulli Kroll <ulli.kroll@...glemail.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 5/5] net: ethernet: cortina: Implement .set_pauseparam()

On Mon, May 13, 2024 at 7:22 PM Andrew Lunn <andrew@...n.ch> wrote:
> On Mon, May 13, 2024 at 03:38:52PM +0200, Linus Walleij wrote:
> > The Cortina Gemini ethernet can very well set up TX or RX
> > pausing, so add this functionality to the driver in a
> > .set_pauseparam() callback.
> >
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > ---
> >  drivers/net/ethernet/cortina/gemini.c | 15 +++++++++++++++
> >  1 file changed, 15 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/cortina/gemini.c b/drivers/net/ethernet/cortina/gemini.c
> > index 85a9777083ba..4ae25a064407 100644
> > --- a/drivers/net/ethernet/cortina/gemini.c
> > +++ b/drivers/net/ethernet/cortina/gemini.c
> > @@ -2146,6 +2146,20 @@ static void gmac_get_pauseparam(struct net_device *netdev,
> >       pparam->autoneg = true;
> >  }
> >
> > +static int gmac_set_pauseparam(struct net_device *netdev,
> > +                            struct ethtool_pauseparam *pparam)
> > +{
> > +     struct phy_device *phydev = netdev->phydev;
> > +
> > +     if (!pparam->autoneg)
> > +             return -EOPNOTSUPP;
> > +
> > +     gmac_set_flow_control(netdev, pparam->tx_pause, pparam->rx_pause);
>
> It is not obvious to my why you need this call here?

I don't know if I don't understand the flow of code here...

The Datasheet says that these registers shall be programmed to
match what is set up in the PHY.

Yours,
Linus Walleij