Re: [PATCH net-next v1 4/9] net: dsa: qca: ar9331: make proper initial port defaults
From: Vladimir Oltean <olteanv@gmail.com>
Date: 2021-04-04 00:16:36
Also in:
lkml, netdev
On Sat, Apr 03, 2021 at 01:48:43PM +0200, Oleksij Rempel wrote:
quoted hunk ↗ jump to hunk
Make sure that all external port are actually isolated from each other, so no packets are leaked. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> --- drivers/net/dsa/qca/ar9331.c | 145 ++++++++++++++++++++++++++++++++++- 1 file changed, 143 insertions(+), 2 deletions(-)diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c index 9a5035b2f0ff..a3de3598fbf5 100644 --- a/drivers/net/dsa/qca/ar9331.c +++ b/drivers/net/dsa/qca/ar9331.c@@ -60,10 +60,19 @@ /* MIB registers */ #define AR9331_MIB_COUNTER(x) (0x20000 + ((x) * 0x100))@@ -229,6 +278,7 @@ struct ar9331_sw_priv { struct regmap *regmap; struct reset_control *sw_reset; struct ar9331_sw_port port[AR9331_SW_PORTS]; + int cpu_port; }; static struct ar9331_sw_priv *ar9331_sw_port_to_priv(struct ar9331_sw_port *port)@@ -371,12 +421,72 @@ 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); + + if (dsa_is_cpu_port(ds, port)) { + /* + * CPU port should be allowed to communicate with all user + * ports. + */ + //port_mask = dsa_user_ports(ds);
Code commented out should ideally not be part of a submitted patch. And the networking comment style is: /* CPU port should be allowed to communicate with all user * ports. */
+ port_mask = 0;
+ /*
+ * Enable atheros header on CPU port. This will allow us
+ * communicate with each port separately
+ */
+ port_ctrl |= AR9331_SW_PORT_CTRL_HEAD_EN;
+ port_ctrl |= AR9331_SW_PORT_CTRL_LEARN_EN;
+ } else if (dsa_is_user_port(ds, port)) {
+ /*
+ * User ports should communicate only with the CPU port.
+ */
+ port_mask = BIT(priv->cpu_port);For all you care, the CPU port here is dsa_to_port(ds, port)->cpu_dp->index, no need to go to those lengths in order to find it. DSA does not have a fixed number for the CPU port but a CPU port pointer per port in order to not close the door for the future support of multiple CPU ports.
+ /* Enable unicast address learning by default */ + port_ctrl |= AR9331_SW_PORT_CTRL_LEARN_EN + /* IGMP snooping seems to work correctly, let's use it */ + | AR9331_SW_PORT_CTRL_IGMP_MLD_EN
I don't really like this ad-hoc enablement of IGMP/MLD snooping from the driver, please add the pass-through in DSA for SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED (dsa_slave_port_attr_set, dsa_port_switchdev_sync, dsa_port_switchdev_unsync should all call a dsa_switch_ops :: port_snoop_igmp_mld function) and then toggle this bit from there.
quoted hunk ↗ jump to hunk
+ | AR9331_SW_PORT_CTRL_SINGLE_VLAN_EN; + } 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_ratelimited(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;@@ -390,7 +500,8 @@ static int ar9331_sw_setup(struct dsa_switch *ds) /* Do not drop broadcast frames */ ret = regmap_write_bits(regmap, AR9331_SW_REG_FLOOD_MASK, - AR9331_SW_FLOOD_MASK_BROAD_TO_CPU, + AR9331_SW_FLOOD_MASK_BROAD_TO_CPU + | AR9331_SW_FLOOD_MASK_MULTI_FLOOD_DP, AR9331_SW_FLOOD_MASK_BROAD_TO_CPU); if (ret) goto error;@@ -402,6 +513,36 @@ static int ar9331_sw_setup(struct dsa_switch *ds) if (ret) goto error; + /* + * Configure the ARL: + * AR9331_SW_AT_ARP_EN - why? + * AR9331_SW_AT_LEARN_CHANGE_EN - why? + */
Good question, why?
+ ret = regmap_set_bits(regmap, AR9331_SW_REG_ADDR_TABLE_CTRL,
+ AR9331_SW_AT_ARP_EN |
+ AR9331_SW_AT_LEARN_CHANGE_EN);
+ if (ret)
+ goto error;
+
+ /* find the CPU port */
+ priv->cpu_port = -1;
+ for (i = 0; i < ds->num_ports; i++) {
+ if (!dsa_is_cpu_port(ds, i))
+ continue;
+
+ if (priv->cpu_port != -1)
+ dev_err_ratelimited(priv->dev, "%s: more then one CPU port. Already set: %i, trying to add: %i\n",than, not then
+ __func__, priv->cpu_port, i);
+ else
+ priv->cpu_port = i;
+ }
+
+ 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;
--
2.29.2