Re: [PATCH net v2 1/1] net: dsa: qca: ar9331: make proper initial port defaults

Vladimir Oltean
2021-08-03T09:06:12Z

On Tue, Aug 03, 2021 at 10:53:20AM +0200, Oleksij Rempel wrote:
> Make sure that all external port are actually isolated from each other,
> so no packets are leaked.
>
> Fixes: ec6698c272de ("net: dsa: add support for Atheros AR9331 built-in switch")
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
> changes v2:
> - do not enable address learning by default
>
> drivers/net/dsa/qca/ar9331.c | 98 +++++++++++++++++++++++++++++++++++-
> 1 file changed, 97 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c
> index 6686192e1883..de7c06b6c85f 100644
> --- a/drivers/net/dsa/qca/ar9331.c
> +++ b/drivers/net/dsa/qca/ar9331.c
> @@ -101,6 +101,46 @@
> AR9331_SW_PORT_STATUS_RX_FLOW_EN | AR9331_SW_PORT_STATUS_TX_FLOW_EN | \
> AR9331_SW_PORT_STATUS_SPEED_M)
>
> +#define AR9331_SW_REG_PORT_CTRL(_port) (0x104 + (_port) * 0x100)
> +#define AR9331_SW_PORT_CTRL_ING_MIRROR_EN BIT(17)

not used

> +#define AR9331_SW_PORT_CTRL_EG_MIRROR_EN BIT(16)

not used

> +#define AR9331_SW_PORT_CTRL_DOUBLE_TAG_VLAN BIT(15)

not used

> +#define AR9331_SW_PORT_CTRL_LEARN_EN BIT(14)

not used

> +#define AR9331_SW_PORT_CTRL_SINGLE_VLAN_EN BIT(13)

not used

> +#define AR9331_SW_PORT_CTRL_MAC_LOOP_BACK BIT(12)

not used

> +#define AR9331_SW_PORT_CTRL_HEAD_EN BIT(11)
> +#define AR9331_SW_PORT_CTRL_IGMP_MLD_EN BIT(10)

not used

> +#define AR9331_SW_PORT_CTRL_EG_VLAN_MODE GENMASK(9, 8)

not used

> +#define AR9331_SW_PORT_CTRL_EG_VLAN_MODE_KEEP 0

not used

> +#define AR9331_SW_PORT_CTRL_EG_VLAN_MODE_STRIP 1

not used

> +#define AR9331_SW_PORT_CTRL_EG_VLAN_MODE_ADD 2

not used

> +#define AR9331_SW_PORT_CTRL_EG_VLAN_MODE_DOUBLE 3

not used

> +#define AR9331_SW_PORT_CTRL_LEARN_ONE_LOCK BIT(7)

not used

> +#define AR9331_SW_PORT_CTRL_PORT_LOCK_EN BIT(6)

not used

> +#define AR9331_SW_PORT_CTRL_LOCK_DROP_EN BIT(5)

not used

> +#define AR9331_SW_PORT_CTRL_PORT_STATE GENMASK(2, 0)
> +#define AR9331_SW_PORT_CTRL_PORT_STATE_DISABLED 0
> +#define AR9331_SW_PORT_CTRL_PORT_STATE_BLOCKING 1
> +#define AR9331_SW_PORT_CTRL_PORT_STATE_LISTENING 2
> +#define AR9331_SW_PORT_CTRL_PORT_STATE_LEARNING 3
> +#define AR9331_SW_PORT_CTRL_PORT_STATE_FORWARD 4
> +
> +#define AR9331_SW_REG_PORT_VLAN(_port) (0x108 + (_port) * 0x100)
> +#define AR9331_SW_PORT_VLAN_8021Q_MODE GENMASK(31, 30)
> +#define AR9331_SW_8021Q_MODE_SECURE 3
> +#define AR9331_SW_8021Q_MODE_CHECK 2
> +#define AR9331_SW_8021Q_MODE_FALLBACK 1
> +#define AR9331_SW_8021Q_MODE_NONE 0
> +#define AR9331_SW_PORT_VLAN_ING_PORT_PRI GENMASK(29, 27)
> +#define AR9331_SW_PORT_VLAN_FORCE_PORT_VLAN_EN BIT(26)
> +#define AR9331_SW_PORT_VLAN_PORT_VID_MEMBER GENMASK(25, 16)
> +#define AR9331_SW_PORT_VLAN_ARP_LEAKY_EN BIT(15)
> +#define AR9331_SW_PORT_VLAN_UNI_LEAKY_EN BIT(14)
> +#define AR9331_SW_PORT_VLAN_MULTI_LEAKY_EN BIT(13)
> +#define AR9331_SW_PORT_VLAN_FORCE_DEFALUT_VID_EN BIT(12)
> +#define AR9331_SW_PORT_VLAN_PORT_VID GENMASK(11, 0)
> +#define AR9331_SW_PORT_VLAN_PORT_VID_DEF 1
> +
> /* MIB registers */
> #define AR9331_MIB_COUNTER(x) (0x20000 + ((x) * 0x100))
>
> @@ -371,12 +411,62 @@ static int ar9331_sw_mbus_init(struct ar9331_sw_priv *priv)
> return 0;
> }
>
> -static int ar9331_sw_setup(struct dsa_switch *ds)
> +static int ar9331_sw_setup_port(struct dsa_switch *ds, int port)
> {
> struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
> struct regmap *regmap = priv->regmap;
> + u32 port_mask, port_ctrl, val;
> int ret;
>
> + /* Generate default port settings */
> + port_ctrl = FIELD_PREP(AR9331_SW_PORT_CTRL_PORT_STATE,
> + AR9331_SW_PORT_CTRL_PORT_STATE_DISABLED);

PORT_STATE_DISABLED? why? Can you ping over any interface after applying
this patch?

> +
> + if (dsa_is_cpu_port(ds, port)) {
> + /* CPU port should be allowed to communicate with all user
> + * ports.
> + */
> + port_mask = dsa_user_ports(ds);
> + /* Enable Atheros header on CPU port. This will allow us
> + * communicate with each port separately
> + */
> + port_ctrl |= AR9331_SW_PORT_CTRL_HEAD_EN;
> + } else if (dsa_is_user_port(ds, port)) {
> + /* User ports should communicate only with the CPU port.
> + */
> + port_mask = BIT(dsa_to_port(ds, port)->cpu_dp->index);

You can use "port_mask = BIT(dsa_upstream_port(ds, port));", looks nicer
at least to me.

> + } else {
> + /* Other ports do not need to communicate at all */
> + port_mask = 0;
> + }
> +
> + val = FIELD_PREP(AR9331_SW_PORT_VLAN_8021Q_MODE,
> + AR9331_SW_8021Q_MODE_NONE) |
> + FIELD_PREP(AR9331_SW_PORT_VLAN_PORT_VID_MEMBER, port_mask) |
> + FIELD_PREP(AR9331_SW_PORT_VLAN_PORT_VID,
> + AR9331_SW_PORT_VLAN_PORT_VID_DEF);
> +
> + ret = regmap_write(regmap, AR9331_SW_REG_PORT_VLAN(port), val);
> + if (ret)
> + goto error;
> +
> + ret = regmap_write(regmap, AR9331_SW_REG_PORT_CTRL(port), port_ctrl);
> + if (ret)
> + goto error;
> +
> + return 0;
> +error:
> + dev_err(priv->dev, "%s: error: %i\n", __func__, ret);
> +
> + return ret;
> +}
> +
> +static int ar9331_sw_setup(struct dsa_switch *ds)
> +{
> + struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
> + struct regmap *regmap = priv->regmap;
> + int ret, i;
> +
> ret = ar9331_sw_reset(priv);
> if (ret)
> return ret;
> @@ -402,6 +492,12 @@ static int ar9331_sw_setup(struct dsa_switch *ds)
> if (ret)
> goto error;
>
> + for (i = 0; i < ds->num_ports; i++) {
> + ret = ar9331_sw_setup_port(ds, i);
> + if (ret)
> + goto error;
> + }
> +
> ds->configure_vlan_while_not_filtering = false;
>
> return 0;
> --
> 2.30.2
>