netdev - Re: [PATCH v2 net-next 3/5] dsa: add DSA switch driver for Microchip KSZ9477

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Date:   Sat, 13 May 2017 15:13:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Woojung.Huh@...rochip.com
Cc:     f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        sergei.shtylyov@...entembedded.com, netdev@...r.kernel.org,
        davem@...emloft.net, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 net-next 3/5] dsa: add DSA switch driver for Microchip
 KSZ9477

On Fri, May 12, 2017 at 08:07:58PM +0000, Woojung.Huh@...rochip.com wrote:

> +static void ksz_config_cpu_port(struct dsa_switch *ds)
> +{
> +	struct ksz_device *dev = ds->priv;
> +	int i;
> +
> +	ds->num_ports = dev->port_cnt;
> +
> +	for (i = 0; i < ds->num_ports; i++) {
> +		if (dsa_is_cpu_port(ds, i)) {
> +			dev->cpu_port = i;
> +			/* enable tag tail for host port */
> +			ksz_port_cfg(dev, i, REG_PORT_CTRL_0,
> +				     PORT_TAIL_TAG_ENABLE, true);
> +		}
> +	}
> +}


> +static const struct ksz_chip_data ksz_switch_chips[] = {
> +	{
> +		.chip_id = 0x00947700,
> +		.dev_name = "KSZ9477",
> +		.num_vlans = 4096,
> +		.num_alus = 4096,
> +		.num_statics = 16,
> +		.enabled_ports = 0x1F,	/* port0-4 */
> +		.cpu_port = 5,		/* port5 (RGMII) */
> +		.port_cnt = 7,
> +		.phy_port_cnt = 5,
> +	},
> +};

Hi Woojung

Do we need cpu_port in this table? Can any port be used as a CPU port?
>From the code in ksz_config_cpu_port() it seems like it can.

And do we need enabled_ports? This seems to suggest only ports 0-4 can
be user ports?

Thanks
	Andrew