netdev - Re: [PATCH v2 3/4] net: dsa: hsr: Enable in KSZ9477 switch HW HSR offloading

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Date: Sun, 3 Sep 2023 19:17:17 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Lukasz Majewski <lukma@...x.de>
Cc: Eric Dumazet <edumazet@...gle.com>, davem@...emloft.net,
	Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Vladimir Oltean <olteanv@...il.com>, Tristram.Ha@...rochip.com,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, UNGLinuxDriver@...rochip.com,
	George McCollister <george.mccollister@...il.com>,
	Oleksij Rempel <o.rempel@...gutronix.de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] net: dsa: hsr: Enable in KSZ9477 switch HW HSR
 offloading

> +int ksz9477_hsr_join(struct dsa_switch *ds, int port, struct net_device *hsr,
> +		     struct dsa_port *partner)
> +{
> +	struct ksz_device *dev = ds->priv;
> +	struct net_device *slave;
> +	u8 i, data;
> +	int ret;
> +
> +	/* Program which ports shall support HSR */
> +	dev->hsr_ports = BIT(port) | BIT(partner->index);
> +	ksz_write32(dev, REG_HSR_PORT_MAP__4, 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);
> +
> +	/* Self MAC address filtering for HSR frames to avoid
> +	 * traverse of the HSR ring more than once.
> +	 *
> +	 * The HSR port (i.e. hsr0) MAC address is used.
> +	 */
> +	if (!is_valid_ether_addr(hsr->dev_addr)) {
> +		dev_err(dev->dev,
> +			"Set valid MAC address to %s for HSR operation!",
> +			hsr->name);
> +		return -EINVAL;
> +	}

This seems like something which should be done at a higher level, not
per driver. Please check if there is an existing test, and if not, add
one in the HSR core.

    Andrew