netdev - Re: [PATCH v5 net-next 5/5] net: dsa: microchip: Enable HSR offloading for KSZ9477

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Date: Fri, 22 Sep 2023 13:29:04 +0200
From: Lukasz Majewski <lukma@...x.de>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Tristram.Ha@...rochip.com, Eric Dumazet <edumazet@...gle.com>, Andrew
 Lunn <andrew@...n.ch>, davem@...emloft.net, Woojung Huh
 <woojung.huh@...rochip.com>, Oleksij Rempel <o.rempel@...gutronix.de>,
 Florian Fainelli <f.fainelli@...il.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, UNGLinuxDriver@...rochip.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Vladimir Oltean
 <vladimir.oltean@....com>
Subject: Re: [PATCH v5 net-next 5/5] net: dsa: microchip: Enable HSR
 offloading for KSZ9477

Hi Vladimir,

> On Wed, Sep 20, 2023 at 01:43:43PM +0200, Lukasz Majewski wrote:
> > +void ksz9477_hsr_join(struct dsa_switch *ds, int port, struct
> > net_device *hsr) +{
> > +	struct ksz_device *dev = ds->priv;
> > +	struct net_device *slave;
> > +	u8 data;
> > +
> > +	/* Program which port(s) shall support HSR */
> > +	ksz_rmw32(dev, REG_HSR_PORT_MAP__4, BIT(port), BIT(port));
> > +
> > +	/* Forward frames between HSR ports (i.e. bridge together
> > HSR ports) */
> > +	ksz9477_cfg_port_member(dev, port,
> > +				BIT(dsa_upstream_port(ds, port)) |
> > BIT(port));  
> 
> Isn't this supposed to be
> 
> 	ksz9477_cfg_port_member(dev, port,
> 				BIT(dsa_upstream_port(ds, port)) |
> BIT(pair));
> 
> where "pair" is not even passed as an argument to ksz9477_hsr_join(),
> but represents the *other* port in the HSR ring, not this one?

Unfortunately, yes...

The code as it is now -> would set for port lan1 0x21 and lan2 0x22.

However the setup shall be 0x23 for both ports.

More info here:
https://github.com/Microchip-Ethernet/EVB-KSZ9477/issues/98#issuecomment-1701557449

I will setup this register from dev->hsr_ports when both HSR ports are
known.


> 
> > +
> > +	if (!dev->hsr_ports) {
> > +		/* Enable discarding of received HSR frames */
> > +		ksz_read8(dev, REG_HSR_ALU_CTRL_0__1, &data);
> > +		data |= HSR_DUPLICATE_DISCARD;
> > +		data &= ~HSR_NODE_UNICAST;
> > +		ksz_write8(dev, REG_HSR_ALU_CTRL_0__1, data);
> > +	}
> > +
> > +	/* Enable per port self-address filtering.
> > +	 * The global self-address filtering has already been
> > enabled in the
> > +	 * ksz9477_reset_switch() function.
> > +	 */
> > +	ksz_port_cfg(dev, port, REG_PORT_LUE_CTRL,
> > PORT_SRC_ADDR_FILTER, true); +
> > +	/* Setup HW supported features for lan HSR ports */
> > +	slave = dsa_to_port(ds, port)->slave;
> > +	slave->features |= KSZ9477_SUPPORTED_HSR_FEATURES;
> > +}
> > diff --git a/drivers/net/dsa/microchip/ksz_common.h
> > b/drivers/net/dsa/microchip/ksz_common.h index
> > 1f3fb6c23f36..1f447a34f555 100644 ---
> > a/drivers/net/dsa/microchip/ksz_common.h +++
> > b/drivers/net/dsa/microchip/ksz_common.h @@ -101,6 +101,11 @@
> > struct ksz_ptp_irq { int num;
> >  };
> >  
> > +struct ksz_switch_macaddr {
> > +	unsigned char addr[ETH_ALEN];
> > +	refcount_t refcount;
> > +};
> > +
> >  struct ksz_port {
> >  	bool remove_tag;		/* Remove Tag flag set,
> > for ksz8795 only */ bool learning;
> > @@ -169,6 +174,10 @@ struct ksz_device {
> >  	struct mutex lock_irq;		/* IRQ Access */
> >  	struct ksz_irq girq;
> >  	struct ksz_ptp_data ptp_data;
> > +
> > +	struct ksz_switch_macaddr *switch_macaddr;
> > +	struct net_device *hsr_dev;     /* HSR */  
> 
> Please be consistent with the lines above, and use tabs to align the
> "/* HSR */" comment.
> 
> > +	u8 hsr_ports;
> >  };
> >  
> >  /* List of supported models */
> > -- 
> > 2.20.1
> >   
> 




Best regards,

Lukasz Majewski

--

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