netdev - Re: [RFC 3/3] staging: octeon: convert to use phylink

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Message-ID: <4ba4bab4-c9ab-468f-ac35-510612529b89@kili.mountain>
Date:   Thu, 13 Apr 2023 19:10:47 +0300
From:   Dan Carpenter <error27@...il.com>
To:     Ladislav Michl <oss-lists@...ops.cz>
Cc:     linux-staging@...ts.linux.dev, netdev@...r.kernel.org,
        linux-mips@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: Re: [RFC 3/3] staging: octeon: convert to use phylink

On Thu, Apr 13, 2023 at 06:04:47PM +0200, Ladislav Michl wrote:
> > > diff --git a/drivers/staging/octeon/ethernet-rgmii.c b/drivers/staging/octeon/ethernet-rgmii.c
> > > index 0c4fac31540a..8c6eb0b87254 100644
> > > --- a/drivers/staging/octeon/ethernet-rgmii.c
> > > +++ b/drivers/staging/octeon/ethernet-rgmii.c
> > > @@ -115,17 +115,8 @@ static void cvm_oct_rgmii_poll(struct net_device *dev)
> > >  
> > >  	cvm_oct_check_preamble_errors(dev);
> > >  
> > > -	if (likely(!status_change))
> >                    ^
> > Negated.
> 
> On purpose.
> 
> > > -		return;
> > > -
> > > -	/* Tell core. */
> > > -	if (link_info.s.link_up) {
> > > -		if (!netif_carrier_ok(dev))
> > > -			netif_carrier_on(dev);
> > > -	} else if (netif_carrier_ok(dev)) {
> > > -		netif_carrier_off(dev);
> > > -	}
> > > -	cvm_oct_note_carrier(priv, link_info);
> > > +	if (likely(status_change))
> > 
> > Originally a status_change was unlikely but now it is likely.
> 
> Yes, but originally it returned after condition and now it executes
> phylink_mac_change. This is just to emulate current bahaviour.
> Later mac interrupts should be used to drive link change.

I don't think you have seen the (minor) issue.  Originally it was
likely that status_change was NOT set.  But now it is likely that is
*IS* set.

regards,
dan carpenter