[PATCH v6 net-next 10/10] net: dsa: microchip: add support for vlan operations

[Prasanna Vengateshan <prasanna.vengateshan@microchip.com>]

Support for VLAN add, del, prepare and filtering operations.

The VLAN aware is a global setting. Mixed vlan filterings
are not supported. vlan_filtering_is_global is made as true
in lan937x_setup function.

Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@microchip.com>
---
 drivers/net/dsa/microchip/lan937x_main.c | 188 +++++++++++++++++++++++
 1 file changed, 188 insertions(+)

diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 980fd74b3bc1..3f1f86633173 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -17,6 +17,14 @@
 #include "ksz_common.h"
 #include "lan937x_dev.h"
 
+static int lan937x_wait_vlan_ctrl_ready(struct ksz_device *dev)
+{
+	unsigned int val;
+
+	return regmap_read_poll_timeout(dev->regmap[0], REG_SW_VLAN_CTRL, val,
+					!(val & VLAN_START), 10, 1000);
+}
+
 static u8 lan937x_get_fid(u16 vid)
 {
 	if (vid > ALU_FID_SIZE)
@@ -25,6 +33,97 @@ static u8 lan937x_get_fid(u16 vid)
 		return vid;
 }
 
+static int lan937x_get_vlan_table(struct ksz_device *dev, u16 vid,
+				  struct lan937x_vlan *vlan_entry)
+{
+	u32 data;
+	int ret;
+
+	mutex_lock(&dev->vlan_mutex);
+
+	ret = ksz_write16(dev, REG_SW_VLAN_ENTRY_INDEX__2, vid & VLAN_INDEX_M);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_write8(dev, REG_SW_VLAN_CTRL, VLAN_READ | VLAN_START);
+	if (ret < 0)
+		goto exit;
+
+	/* wait to be cleared */
+	ret = lan937x_wait_vlan_ctrl_ready(dev);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_read32(dev, REG_SW_VLAN_ENTRY__4, &data);
+	if (ret < 0)
+		goto exit;
+
+	vlan_entry->valid = !!(data & VLAN_VALID);
+	vlan_entry->fid	= data & VLAN_FID_M;
+
+	ret = ksz_read32(dev, REG_SW_VLAN_ENTRY_UNTAG__4,
+			 &vlan_entry->untag_prtmap);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_read32(dev, REG_SW_VLAN_ENTRY_PORTS__4,
+			 &vlan_entry->fwd_map);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_write8(dev, REG_SW_VLAN_CTRL, 0);
+	if (ret < 0)
+		goto exit;
+
+exit:
+	mutex_unlock(&dev->vlan_mutex);
+
+	return ret;
+}
+
+static int lan937x_set_vlan_table(struct ksz_device *dev, u16 vid,
+				  struct lan937x_vlan *vlan_entry)
+{
+	u32 data;
+	int ret;
+
+	mutex_lock(&dev->vlan_mutex);
+
+	data = vlan_entry->valid ? VLAN_VALID : 0;
+	data |= vlan_entry->fid;
+
+	ret = ksz_write32(dev, REG_SW_VLAN_ENTRY__4, data);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_write32(dev, REG_SW_VLAN_ENTRY_UNTAG__4,
+			  vlan_entry->untag_prtmap);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_write32(dev, REG_SW_VLAN_ENTRY_PORTS__4, vlan_entry->fwd_map);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_write16(dev, REG_SW_VLAN_ENTRY_INDEX__2, vid & VLAN_INDEX_M);
+	if (ret < 0)
+		goto exit;
+
+	ret = ksz_write8(dev, REG_SW_VLAN_CTRL, VLAN_START | VLAN_WRITE);
+	if (ret < 0)
+		goto exit;
+
+	/* wait to be cleared */
+	ret = lan937x_wait_vlan_ctrl_ready(dev);
+	if (ret < 0)
+		goto exit;
+
+exit:
+	mutex_unlock(&dev->vlan_mutex);
+
+	return ret;
+}
+
 static int lan937x_read_table(struct ksz_device *dev, u32 *table)
 {
 	int ret;
@@ -189,6 +288,92 @@ static void lan937x_port_stp_state_set(struct dsa_switch *ds, int port,
 		ksz_update_port_member(dev, port);
 }
 
+static int lan937x_port_vlan_filtering(struct dsa_switch *ds, int port,
+				       bool flag,
+				       struct netlink_ext_ack *extack)
+{
+	struct ksz_device *dev = ds->priv;
+
+	/* enable/disable VLAN mode, once enabled, look up process starts
+	 * and then forwarding and discarding are done based on port
+	 * membership of the VLAN table
+	 */
+	return lan937x_cfg(dev, REG_SW_LUE_CTRL_0, SW_VLAN_ENABLE, flag);
+}
+
+static int lan937x_port_vlan_add(struct dsa_switch *ds, int port,
+				 const struct switchdev_obj_port_vlan *vlan,
+				 struct netlink_ext_ack *extack)
+{
+	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+	struct ksz_device *dev = ds->priv;
+	struct lan937x_vlan vlan_entry;
+	int ret;
+
+	ret = lan937x_get_vlan_table(dev, vlan->vid, &vlan_entry);
+	if (ret < 0) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to get vlan table");
+		return ret;
+	}
+
+	vlan_entry.fid = lan937x_get_fid(vlan->vid);
+	vlan_entry.valid = true;
+
+	/* set/clear switch port when updating vlan table registers */
+	if (untagged)
+		vlan_entry.untag_prtmap |= BIT(port);
+	else
+		vlan_entry.untag_prtmap &= ~BIT(port);
+
+	vlan_entry.fwd_map |= BIT(port);
+
+	ret = lan937x_set_vlan_table(dev, vlan->vid, &vlan_entry);
+	if (ret < 0) {
+		NL_SET_ERR_MSG_MOD(extack, "Failed to set vlan table");
+		return ret;
+	}
+
+	/* change PVID */
+	if (vlan->flags & BRIDGE_VLAN_INFO_PVID) {
+		ret = lan937x_pwrite16(dev, port, REG_PORT_DEFAULT_VID,
+				       vlan->vid);
+		if (ret < 0) {
+			NL_SET_ERR_MSG_MOD(extack, "Failed to set pvid");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int lan937x_port_vlan_del(struct dsa_switch *ds, int port,
+				 const struct switchdev_obj_port_vlan *vlan)
+{
+	struct ksz_device *dev = ds->priv;
+	struct lan937x_vlan vlan_entry;
+	u16 pvid;
+	int ret;
+
+	lan937x_pread16(dev, port, REG_PORT_DEFAULT_VID, &pvid);
+
+	ret = lan937x_get_vlan_table(dev, vlan->vid, &vlan_entry);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to get vlan table\n");
+		return ret;
+	}
+	/* clear port fwd map & untag entries*/
+	vlan_entry.fwd_map &= ~BIT(port);
+	vlan_entry.untag_prtmap &= ~BIT(port);
+
+	ret = lan937x_set_vlan_table(dev, vlan->vid, &vlan_entry);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to set vlan table\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static int lan937x_port_fdb_add(struct dsa_switch *ds, int port,
 				const unsigned char *addr, u16 vid)
 {
@@ -1036,6 +1221,9 @@ const struct dsa_switch_ops lan937x_switch_ops = {
 	.port_bridge_leave = ksz_port_bridge_leave,
 	.port_stp_state_set = lan937x_port_stp_state_set,
 	.port_fast_age = ksz_port_fast_age,
+	.port_vlan_filtering = lan937x_port_vlan_filtering,
+	.port_vlan_add = lan937x_port_vlan_add,
+	.port_vlan_del = lan937x_port_vlan_del,
 	.port_fdb_dump = lan937x_port_fdb_dump,
 	.port_fdb_add = lan937x_port_fdb_add,
 	.port_fdb_del = lan937x_port_fdb_del,
-- 
2.27.0