linux-kernel - Re: [PATCH v1 net-next] net: dsa: Allow only up to two HSR HW offloaded ports for KSZ9477

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Date: Tue, 18 Jun 2024 17:06:20 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Lukasz Majewski <lukma@...x.de>, Vladimir Oltean <olteanv@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Oleksij Rempel <o.rempel@...gutronix.de>, Tristram.Ha@...rochip.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Simon Horman <horms@...nel.org>,
	"Ricardo B. Marliere" <ricardo@...liere.net>,
	Casper Andersson <casper.casan@...il.com>,
	linux-kernel@...r.kernel.org,
	Woojung Huh <woojung.huh@...rochip.com>,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v1 net-next] net: dsa: Allow only up to two HSR HW
 offloaded ports for KSZ9477

On Tue, Jun 18, 2024 at 03:52:23PM +0200, Andrew Lunn wrote:
> > diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> > index 2818e24e2a51..181e81af3a78 100644
> > --- a/drivers/net/dsa/microchip/ksz_common.c
> > +++ b/drivers/net/dsa/microchip/ksz_common.c
> > @@ -3906,6 +3906,11 @@ static int ksz_hsr_join(struct dsa_switch *ds, int port, struct net_device *hsr,
> >  		return -EOPNOTSUPP;
> >  	}
> >  
> > +	if (hweight8(dev->hsr_ports) > 1) {
> > +		NL_SET_ERR_MSG_MOD(extack, "Cannot offload more than two ports (in use=0x%x)", dev->hsr_ports);
> > +		return -EOPNOTSUPP;
> > +	}
> 
> Hi Dan
> 
> I don't know HSR to well, but this is offloading to hardware, to
> accelerate what Linux is already doing in software. It should be, if
> the hardware says it cannot do it, software will continue to do the
> job. So the extack message should never be seen.

Ah.  Okay.  However the rest of the function prints similar messages
and so probably we could remove those error messages as well.  To be
honest, I just wanted something which functioned as a comment and
mentioned "two ports".  Perhaps the condition would be more clear as
>= 2 instead of > 1?

regards,
dan carpenter