Date:   Mon,  2 Aug 2021 15:10:37 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: [PATCH net-next v3 6/6] net: dsa: qca: ar9331: add vlan support

This switch provides simple VLAN resolution database for 16 entries.
With this database we can cover typical functionalities as port based
VLANs, untagged and tagged egress. Port based ingress filtering.

The VLAN database is working on top of forwarding database. So,
potentially, we can have multiple VLANs on top of multiple bridges.
Hawing one VLAN on top of multiple bridges will fail on different
levels, most probably DSA framework should warn if some one won't to make
something likes this.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/dsa/qca/ar9331.c | 235 ++++++++++++++++++++++++++++++++++-
 1 file changed, 233 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/qca/ar9331.c b/drivers/net/dsa/qca/ar9331.c
index a0324fed2136..0865ffbc2c74 100644
--- a/drivers/net/dsa/qca/ar9331.c
+++ b/drivers/net/dsa/qca/ar9331.c
@@ -67,6 +67,27 @@
 #define AR9331_SW_REG_GLOBAL_CTRL		0x30
 #define AR9331_SW_GLOBAL_CTRL_MFS_M		GENMASK(13, 0)
 
+#define AR9331_SW_NUM_VLAN_RECORDS		16
+
+#define AR9331_SW_REG_VLAN_TABLE_FUNCTION0	0x40
+#define AR9331_SW_VT0_PRI_EN			BIT(31)
+#define AR9331_SW_VT0_PRI			GENMASK(30, 28)
+#define AR9331_SW_VT0_VID			GENMASK(27, 16)
+#define AR9331_SW_VT0_PORT_NUM			GENMASK(11, 8)
+#define AR9331_SW_VT0_FULL_VIO			BIT(4)
+#define AR9331_SW_VT0_BUSY			BIT(3)
+#define AR9331_SW_VT0_FUNC			GENMASK(2, 0)
+#define AR9331_SW_VT0_FUNC_NOP			0
+#define AR9331_SW_VT0_FUNC_FLUSH_ALL		1
+#define AR9331_SW_VT0_FUNC_LOAD_ENTRY		2
+#define AR9331_SW_VT0_FUNC_PURGE_ENTRY		3
+#define AR9331_SW_VT0_FUNC_DEL_PORT		4
+#define AR9331_SW_VT0_FUNC_GET_NEXT		5
+
+#define AR9331_SW_REG_VLAN_TABLE_FUNCTION1	0x44
+#define AR9331_SW_VT1_VALID			BIT(11)
+#define AR9331_SW_VT1_VID_MEM			GENMASK(9, 0)
+
 /* Size of the address resolution table (ARL) */
 #define AR9331_SW_NUM_ARL_RECORDS		1024
 
@@ -309,6 +330,11 @@ struct ar9331_sw_port {
 	struct spinlock stats_lock;
 };
 
+struct ar9331_sw_vlan_db {
+	u16 vid;
+	u8 port_mask;
+};
+
 struct ar9331_sw_fdb {
 	u8 port_mask;
 	u8 aging;
@@ -327,6 +353,7 @@ struct ar9331_sw_priv {
 	struct regmap *regmap;
 	struct reset_control *sw_reset;
 	struct ar9331_sw_port port[AR9331_SW_PORTS];
+	struct ar9331_sw_vlan_db vdb[AR9331_SW_NUM_VLAN_RECORDS];
 };
 
 static struct ar9331_sw_priv *ar9331_sw_port_to_priv(struct ar9331_sw_port *port)
@@ -557,8 +584,6 @@ static int ar9331_sw_setup(struct dsa_switch *ds)
 			goto error;
 	}
 
-	ds->configure_vlan_while_not_filtering = false;
-
 	return 0;
 error:
 	dev_err_ratelimited(priv->dev, "%s: %i\n", __func__, ret);
@@ -1144,6 +1169,209 @@ static void ar9331_sw_port_bridge_leave(struct dsa_switch *ds, int port,
 	ar9331_sw_port_bridge_mod(ds, port, br, false);
 }
 
+static int ar9331_port_vlan_filtering(struct dsa_switch *ds, int port,
+				      bool vlan_filtering,
+				      struct netlink_ext_ack *extack)
+{
+	struct ar9331_sw_priv *priv = (struct ar9331_sw_priv *)ds->priv;
+	struct regmap *regmap = priv->regmap;
+	u32 mode;
+	int ret;
+
+	if (vlan_filtering)
+		mode = AR9331_SW_8021Q_MODE_SECURE;
+	else
+		mode = AR9331_SW_8021Q_MODE_NONE;
+
+	ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_VLAN(port),
+				 AR9331_SW_PORT_VLAN_8021Q_MODE,
+				 FIELD_PREP(AR9331_SW_PORT_VLAN_8021Q_MODE,
+					    mode));
+	if (ret)
+		dev_err(priv->dev, "%s: error: %pe\n", __func__, ERR_PTR(ret));
+
+	return ret;
+}
+
+static int ar9331_sw_vt_wait(struct ar9331_sw_priv *priv, u32 *f0)
+{
+	struct regmap *regmap = priv->regmap;
+
+	return regmap_read_poll_timeout(regmap,
+					AR9331_SW_REG_VLAN_TABLE_FUNCTION0,
+					*f0, !(*f0 & AR9331_SW_VT0_BUSY),
+					100, 2000);
+}
+
+static int ar9331_sw_port_vt_rmw(struct ar9331_sw_priv *priv, u16 vid,
+				 u8 port_mask_set, u8 port_mask_clr)
+{
+	struct regmap *regmap = priv->regmap;
+	u32 f0, f1, port_mask = 0, port_mask_new, func;
+	struct ar9331_sw_vlan_db *vdb = NULL;
+	int ret, i;
+
+	if (!vid)
+		return 0;
+
+	ret = ar9331_sw_vt_wait(priv, &f0);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(regmap, AR9331_SW_REG_VLAN_TABLE_FUNCTION0, 0);
+	if (ret)
+		goto error;
+
+	ret = regmap_write(regmap, AR9331_SW_REG_VLAN_TABLE_FUNCTION1, 0);
+	if (ret)
+		goto error;
+
+	for (i = 0; i < ARRAY_SIZE(priv->vdb); i++) {
+		if (priv->vdb[i].vid == vid) {
+			vdb = &priv->vdb[i];
+			break;
+		}
+	}
+
+	ret = regmap_read(regmap, AR9331_SW_REG_VLAN_TABLE_FUNCTION1, &f1);
+	if (ret)
+		return ret;
+
+	if (vdb)
+		port_mask = vdb->port_mask;
+
+	port_mask_new = port_mask & ~port_mask_clr;
+	port_mask_new |= port_mask_set;
+
+	if (port_mask_new && port_mask_new == port_mask)
+		return 0;
+
+	if (port_mask_new) {
+		func = AR9331_SW_VT0_FUNC_LOAD_ENTRY;
+	} else {
+		func = AR9331_SW_VT0_FUNC_PURGE_ENTRY;
+		port_mask_new = port_mask;
+	}
+
+	if (vdb) {
+		vdb->port_mask = port_mask_new;
+
+		if (!port_mask_new)
+			vdb->vid = 0;
+	} else {
+		for (i = 0; i < ARRAY_SIZE(priv->vdb); i++) {
+			if (!priv->vdb[i].vid) {
+				vdb = &priv->vdb[i];
+				break;
+			}
+		}
+
+		if (!vdb)
+			return -ENOMEM;
+
+		vdb->vid = vid;
+		vdb->port_mask = port_mask_new;
+	}
+
+	f0 = FIELD_PREP(AR9331_SW_VT0_VID, vid) |
+	     FIELD_PREP(AR9331_SW_VT0_FUNC, func) |
+	     AR9331_SW_VT0_BUSY;
+	f1 = FIELD_PREP(AR9331_SW_VT1_VID_MEM, port_mask_new) |
+		AR9331_SW_VT1_VALID;
+
+	ret = regmap_write(regmap, AR9331_SW_REG_VLAN_TABLE_FUNCTION1, f1);
+	if (ret)
+		return ret;
+
+	ret = regmap_write(regmap, AR9331_SW_REG_VLAN_TABLE_FUNCTION0, f0);
+	if (ret)
+		return ret;
+
+	ret = ar9331_sw_vt_wait(priv, &f0);
+	if (ret)
+		return ret;
+
+	if (f0 & AR9331_SW_VT0_FULL_VIO) {
+		/* cleanup error status */
+		regmap_write(regmap, AR9331_SW_REG_VLAN_TABLE_FUNCTION0, 0);
+		return -ENOMEM;
+	}
+
+	return 0;
+
+error:
+	dev_err(priv->dev, "%s: error: %pe\n", __func__, ERR_PTR(ret));
+
+	return ret;
+}
+
+static int ar9331_port_vlan_set_pvid(struct ar9331_sw_priv *priv, int port,
+				     u16 pvid)
+{
+	struct regmap *regmap = priv->regmap;
+	int ret;
+	u32 mask, val;
+
+	mask = AR9331_SW_PORT_VLAN_8021Q_MODE |
+		AR9331_SW_PORT_VLAN_FORCE_DEFALUT_VID_EN |
+		AR9331_SW_PORT_VLAN_FORCE_PORT_VLAN_EN;
+	val = AR9331_SW_PORT_VLAN_FORCE_DEFALUT_VID_EN |
+		AR9331_SW_PORT_VLAN_FORCE_PORT_VLAN_EN |
+		FIELD_PREP(AR9331_SW_PORT_VLAN_8021Q_MODE,
+			   AR9331_SW_8021Q_MODE_FALLBACK);
+
+	ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_VLAN(port),
+				 mask, val);
+	if (ret)
+		return ret;
+
+	return regmap_update_bits(regmap, AR9331_SW_REG_PORT_VLAN(port),
+				  AR9331_SW_PORT_VLAN_PORT_VID,
+				  FIELD_PREP(AR9331_SW_PORT_VLAN_PORT_VID,
+					     pvid));
+}
+
+static int ar9331_port_vlan_add(struct dsa_switch *ds, int port,
+				const struct switchdev_obj_port_vlan *vlan,
+				struct netlink_ext_ack *extack)
+{
+	struct ar9331_sw_priv *priv = ds->priv;
+	struct regmap *regmap = priv->regmap;
+	int ret, mode;
+
+	ret = ar9331_sw_port_vt_rmw(priv, vlan->vid, BIT(port), 0);
+	if (ret)
+		goto error;
+
+	if (vlan->flags & BRIDGE_VLAN_INFO_PVID)
+		ret = ar9331_port_vlan_set_pvid(priv, port, vlan->vid);
+
+	if (ret)
+		goto error;
+
+	if (vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED)
+		mode = AR9331_SW_PORT_CTRL_EG_VLAN_MODE_STRIP;
+	else
+		mode = AR9331_SW_PORT_CTRL_EG_VLAN_MODE_ADD;
+
+	ret = regmap_update_bits(regmap, AR9331_SW_REG_PORT_CTRL(port),
+				 AR9331_SW_PORT_CTRL_EG_VLAN_MODE, mode);
+	if (ret)
+		goto error;
+
+	return 0;
+error:
+	dev_err(priv->dev, "%s: error: %pe\n", __func__, ERR_PTR(ret));
+
+	return ret;
+}
+
+static int ar9331_port_vlan_del(struct dsa_switch *ds, int port,
+				const struct switchdev_obj_port_vlan *vlan)
+{
+	return ar9331_sw_port_vt_rmw(ds->priv, vlan->vid, 0, BIT(port));
+}
+
 static const struct dsa_switch_ops ar9331_sw_ops = {
 	.get_tag_protocol	= ar9331_sw_get_tag_protocol,
 	.setup			= ar9331_sw_setup,
@@ -1162,6 +1390,9 @@ static const struct dsa_switch_ops ar9331_sw_ops = {
 	.set_ageing_time	= ar9331_sw_set_ageing_time,
 	.port_bridge_join	= ar9331_sw_port_bridge_join,
 	.port_bridge_leave	= ar9331_sw_port_bridge_leave,
+	.port_vlan_filtering	= ar9331_port_vlan_filtering,
+	.port_vlan_add		= ar9331_port_vlan_add,
+	.port_vlan_del		= ar9331_port_vlan_del,
 };
 
 static irqreturn_t ar9331_sw_irq(int irq, void *data)
-- 
2.30.2

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