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 15:49:28 +0200
From: Lukasz Majewski <lukma@...x.de>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: 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, Andrew Lunn
 <andrew@...n.ch>
Subject: Re: [PATCH v1 net-next] net: dsa: Allow only up to two HSR HW
 offloaded ports for KSZ9477

Hi Dan,

> On Tue, Jun 18, 2024 at 03:04:33PM +0200, Lukasz Majewski wrote:
> > The KSZ9477 allows HSR in-HW offloading for any of two selected
> > ports. This patch adds check if one tries to use more than two
> > ports with HSR offloading enabled.
> > 
> > Signed-off-by: Lukasz Majewski <lukma@...x.de>  
> 
> Is this a bug fix?

This seems to be fixing stuff, which was added earlier to next-next.


>  What is the impact for the user?

Impact is that this board with this particular setup can just
malfunction.

>  Fixes tag?

Ok.

>  Add
> this information to the commit message when you resend.

I will wait a few days for input and then send v2.

Thanks for the input.

> 
> > ---
> >  drivers/net/dsa/microchip/ksz_common.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/net/dsa/microchip/ksz_common.c
> > b/drivers/net/dsa/microchip/ksz_common.c index
> > 2818e24e2a51..0d68f0a5bf19 100644 ---
> > a/drivers/net/dsa/microchip/ksz_common.c +++
> > b/drivers/net/dsa/microchip/ksz_common.c @@ -3913,6 +3913,9 @@
> > static int ksz_hsr_join(struct dsa_switch *ds, int port, struct
> > net_device *hsr, if (ret) return ret;
> >  
> > +	if (dev->chip_id == KSZ9477_CHIP_ID &&
> > hweight8(dev->hsr_ports) > 1)
> > +		return -EOPNOTSUPP;  
> 
> Put this condition before the ksz_switch_macaddr_get().  Otherwise
> we'd need to do a ksz_switch_macaddr_put().
> 
> If dev->chip_id != KSZ9477_CHIP_ID then we would have already
> returned. Really, that should be the first check in this function.
> The hsr_get_version() should be moved to right before we use the
> version. (But that's a separate issue, not related to this patch so
> ignore it).
> 
> So do something like this but write a better error message.
> 
> regards,
> dan carpenter
> 
> 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;
> +	}
> +
>  	/* Self MAC address filtering, to avoid frames traversing
>  	 * the HSR ring more than once.
>  	 */
> 
> 




Best regards,

Lukasz Majewski

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