1 files changed, 317 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_vlan.c b/drivers/net/ethernet/microchip/lan966x/lan966x_vlan.c
new file mode 100644
index 000000000000..8d7260cd7da9
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_vlan.c
@@ -0,0 +1,317 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+#define VLANACCESS_CMD_IDLE		0
+#define VLANACCESS_CMD_READ		1
+#define VLANACCESS_CMD_WRITE		2
+#define VLANACCESS_CMD_INIT		3
+
+static int lan966x_vlan_get_status(struct lan966x *lan966x)
+{
+	return lan_rd(lan966x, ANA_VLANACCESS);
+}
+
+static int lan966x_vlan_wait_for_completion(struct lan966x *lan966x)
+{
+	u32 val;
+
+	return readx_poll_timeout(lan966x_vlan_get_status,
+		lan966x, val,
+		(val & ANA_VLANACCESS_VLAN_TBL_CMD) ==
+		VLANACCESS_CMD_IDLE,
+		TABLE_UPDATE_SLEEP_US, TABLE_UPDATE_TIMEOUT_US);
+}
+
+static void lan966x_vlan_set_mask(struct lan966x *lan966x, u16 vid)
+{
+	u16 mask = lan966x->vlan_mask[vid];
+	bool cpu_dis;
+
+	cpu_dis = !(mask & BIT(CPU_PORT));
+
+	/* Set flags and the VID to configure */
+	lan_rmw(ANA_VLANTIDX_VLAN_PGID_CPU_DIS_SET(cpu_dis) |
+		ANA_VLANTIDX_V_INDEX_SET(vid),
+		ANA_VLANTIDX_VLAN_PGID_CPU_DIS |
+		ANA_VLANTIDX_V_INDEX,
+		lan966x, ANA_VLANTIDX);
+
+	/* Set the vlan port members mask */
+	lan_rmw(ANA_VLAN_PORT_MASK_VLAN_PORT_MASK_SET(mask),
+		ANA_VLAN_PORT_MASK_VLAN_PORT_MASK,
+		lan966x, ANA_VLAN_PORT_MASK);
+
+	/* Issue a write command */
+	lan_rmw(ANA_VLANACCESS_VLAN_TBL_CMD_SET(VLANACCESS_CMD_WRITE),
+		ANA_VLANACCESS_VLAN_TBL_CMD,
+		lan966x, ANA_VLANACCESS);
+
+	if (lan966x_vlan_wait_for_completion(lan966x))
+		dev_err(lan966x->dev, "Vlan set mask failed\n");
+}
+
+static void lan966x_vlan_port_add_vlan_mask(struct lan966x_port *port, u16 vid)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u8 p = port->chip_port;
+
+	lan966x->vlan_mask[vid] |= BIT(p);
+	lan966x_vlan_set_mask(lan966x, vid);
+}
+
+static void lan966x_vlan_port_del_vlan_mask(struct lan966x_port *port, u16 vid)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u8 p = port->chip_port;
+
+	lan966x->vlan_mask[vid] &= ~BIT(p);
+	lan966x_vlan_set_mask(lan966x, vid);
+}
+
+static bool lan966x_vlan_port_any_vlan_mask(struct lan966x *lan966x, u16 vid)
+{
+	return !!(lan966x->vlan_mask[vid] & ~BIT(CPU_PORT));
+}
+
+static void lan966x_vlan_cpu_add_vlan_mask(struct lan966x *lan966x, u16 vid)
+{
+	lan966x->vlan_mask[vid] |= BIT(CPU_PORT);
+	lan966x_vlan_set_mask(lan966x, vid);
+}
+
+static void lan966x_vlan_cpu_del_vlan_mask(struct lan966x *lan966x, u16 vid)
+{
+	lan966x->vlan_mask[vid] &= ~BIT(CPU_PORT);
+	lan966x_vlan_set_mask(lan966x, vid);
+}
+
+static void lan966x_vlan_cpu_add_cpu_vlan_mask(struct lan966x *lan966x, u16 vid)
+{
+	__set_bit(vid, lan966x->cpu_vlan_mask);
+}
+
+static void lan966x_vlan_cpu_del_cpu_vlan_mask(struct lan966x *lan966x, u16 vid)
+{
+	__clear_bit(vid, lan966x->cpu_vlan_mask);
+}
+
+bool lan966x_vlan_cpu_member_cpu_vlan_mask(struct lan966x *lan966x, u16 vid)
+{
+	return test_bit(vid, lan966x->cpu_vlan_mask);
+}
+
+static u16 lan966x_vlan_port_get_pvid(struct lan966x_port *port)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	if (!(lan966x->bridge_mask & BIT(port->chip_port)))
+		return HOST_PVID;
+
+	return port->vlan_aware ? port->pvid : UNAWARE_PVID;
+}
+
+int lan966x_vlan_port_set_vid(struct lan966x_port *port, u16 vid,
+			      bool pvid, bool untagged)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	/* Egress vlan classification */
+	if (untagged && port->vid != vid) {
+		if (port->vid) {
+			dev_err(lan966x->dev,
+				"Port already has a native VLAN: %d\n",
+				port->vid);
+			return -EBUSY;
+		}
+		port->vid = vid;
+	}
+
+	/* Default ingress vlan classification */
+	if (pvid)
+		port->pvid = vid;
+
+	return 0;
+}
+
+static void lan966x_vlan_port_remove_vid(struct lan966x_port *port, u16 vid)
+{
+	if (port->pvid == vid)
+		port->pvid = 0;
+
+	if (port->vid == vid)
+		port->vid = 0;
+}
+
+void lan966x_vlan_port_set_vlan_aware(struct lan966x_port *port,
+				      bool vlan_aware)
+{
+	port->vlan_aware = vlan_aware;
+}
+
+void lan966x_vlan_port_apply(struct lan966x_port *port)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u16 pvid;
+	u32 val;
+
+	pvid = lan966x_vlan_port_get_pvid(port);
+
+	/* Ingress clasification (ANA_PORT_VLAN_CFG) */
+	/* Default vlan to classify for untagged frames (may be zero) */
+	val = ANA_VLAN_CFG_VLAN_VID_SET(pvid);
+	if (port->vlan_aware)
+		val |= ANA_VLAN_CFG_VLAN_AWARE_ENA_SET(1) |
+		       ANA_VLAN_CFG_VLAN_POP_CNT_SET(1);
+
+	lan_rmw(val,
+		ANA_VLAN_CFG_VLAN_VID | ANA_VLAN_CFG_VLAN_AWARE_ENA |
+		ANA_VLAN_CFG_VLAN_POP_CNT,
+		lan966x, ANA_VLAN_CFG(port->chip_port));
+
+	/* Drop frames with multicast source address */
+	val = ANA_DROP_CFG_DROP_MC_SMAC_ENA_SET(1);
+	if (port->vlan_aware && !pvid)
+		/* If port is vlan-aware and tagged, drop untagged and priority
+		 * tagged frames.
+		 */
+		val |= ANA_DROP_CFG_DROP_UNTAGGED_ENA_SET(1) |
+		       ANA_DROP_CFG_DROP_PRIO_S_TAGGED_ENA_SET(1) |
+		       ANA_DROP_CFG_DROP_PRIO_C_TAGGED_ENA_SET(1);
+
+	lan_wr(val, lan966x, ANA_DROP_CFG(port->chip_port));
+
+	/* Egress configuration (REW_TAG_CFG): VLAN tag type to 8021Q */
+	val = REW_TAG_CFG_TAG_TPID_CFG_SET(0);
+	if (port->vlan_aware) {
+		if (port->vid)
+			/* Tag all frames except when VID == DEFAULT_VLAN */
+			val |= REW_TAG_CFG_TAG_CFG_SET(1);
+		else
+			val |= REW_TAG_CFG_TAG_CFG_SET(3);
+	}
+
+	/* Update only some bits in the register */
+	lan_rmw(val,
+		REW_TAG_CFG_TAG_TPID_CFG | REW_TAG_CFG_TAG_CFG,
+		lan966x, REW_TAG_CFG(port->chip_port));
+
+	/* Set default VLAN and tag type to 8021Q */
+	lan_rmw(REW_PORT_VLAN_CFG_PORT_TPID_SET(ETH_P_8021Q) |
+		REW_PORT_VLAN_CFG_PORT_VID_SET(port->vid),
+		REW_PORT_VLAN_CFG_PORT_TPID |
+		REW_PORT_VLAN_CFG_PORT_VID,
+		lan966x, REW_PORT_VLAN_CFG(port->chip_port));
+}
+
+void lan966x_vlan_port_add_vlan(struct lan966x_port *port,
+				u16 vid,
+				bool pvid,
+				bool untagged)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	/* If the CPU(br) is already part of the vlan then add the fdb
+	 * entries in MAC table to copy the frames to the CPU(br).
+	 * If the CPU(br) is not part of the vlan then it would
+	 * just drop the frames.
+	 */
+	if (lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x, vid)) {
+		lan966x_vlan_cpu_add_vlan_mask(lan966x, vid);
+		lan966x_fdb_write_entries(lan966x, vid);
+		lan966x_mdb_write_entries(lan966x, vid);
+	}
+
+	lan966x_vlan_port_set_vid(port, vid, pvid, untagged);
+	lan966x_vlan_port_add_vlan_mask(port, vid);
+	lan966x_vlan_port_apply(port);
+}
+
+void lan966x_vlan_port_del_vlan(struct lan966x_port *port, u16 vid)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	lan966x_vlan_port_remove_vid(port, vid);
+	lan966x_vlan_port_del_vlan_mask(port, vid);
+	lan966x_vlan_port_apply(port);
+
+	/* In case there are no other ports in vlan then remove the CPU from
+	 * that vlan but still keep it in the mask because it may be needed
+	 * again then another port gets added in that vlan
+	 */
+	if (!lan966x_vlan_port_any_vlan_mask(lan966x, vid)) {
+		lan966x_vlan_cpu_del_vlan_mask(lan966x, vid);
+		lan966x_fdb_erase_entries(lan966x, vid);
+		lan966x_mdb_erase_entries(lan966x, vid);
+	}
+}
+
+void lan966x_vlan_cpu_add_vlan(struct lan966x *lan966x, u16 vid)
+{
+	/* Add an entry in the MAC table for the CPU
+	 * Add the CPU part of the vlan only if there is another port in that
+	 * vlan otherwise all the broadcast frames in that vlan will go to CPU
+	 * even if none of the ports are in the vlan and then the CPU will just
+	 * need to discard these frames. It is required to store this
+	 * information so when a front port is added then it would add also the
+	 * CPU port.
+	 */
+	if (lan966x_vlan_port_any_vlan_mask(lan966x, vid)) {
+		lan966x_vlan_cpu_add_vlan_mask(lan966x, vid);
+		lan966x_mdb_write_entries(lan966x, vid);
+	}
+
+	lan966x_vlan_cpu_add_cpu_vlan_mask(lan966x, vid);
+	lan966x_fdb_write_entries(lan966x, vid);
+}
+
+void lan966x_vlan_cpu_del_vlan(struct lan966x *lan966x, u16 vid)
+{
+	/* Remove the CPU part of the vlan */
+	lan966x_vlan_cpu_del_cpu_vlan_mask(lan966x, vid);
+	lan966x_vlan_cpu_del_vlan_mask(lan966x, vid);
+	lan966x_fdb_erase_entries(lan966x, vid);
+	lan966x_mdb_erase_entries(lan966x, vid);
+}
+
+void lan966x_vlan_init(struct lan966x *lan966x)
+{
+	u16 port, vid;
+
+	/* Clear VLAN table, by default all ports are members of all VLANS */
+	lan_rmw(ANA_VLANACCESS_VLAN_TBL_CMD_SET(VLANACCESS_CMD_INIT),
+		ANA_VLANACCESS_VLAN_TBL_CMD,
+		lan966x, ANA_VLANACCESS);
+	lan966x_vlan_wait_for_completion(lan966x);
+
+	for (vid = 1; vid < VLAN_N_VID; vid++) {
+		lan966x->vlan_mask[vid] = 0;
+		lan966x_vlan_set_mask(lan966x, vid);
+	}
+
+	/* Set all the ports + cpu to be part of HOST_PVID and UNAWARE_PVID */
+	lan966x->vlan_mask[HOST_PVID] =
+		GENMASK(lan966x->num_phys_ports - 1, 0) | BIT(CPU_PORT);
+	lan966x_vlan_set_mask(lan966x, HOST_PVID);
+
+	lan966x->vlan_mask[UNAWARE_PVID] =
+		GENMASK(lan966x->num_phys_ports - 1, 0) | BIT(CPU_PORT);
+	lan966x_vlan_set_mask(lan966x, UNAWARE_PVID);
+
+	lan966x_vlan_cpu_add_cpu_vlan_mask(lan966x, UNAWARE_PVID);
+
+	/* Configure the CPU port to be vlan aware */
+	lan_wr(ANA_VLAN_CFG_VLAN_VID_SET(0) |
+	       ANA_VLAN_CFG_VLAN_AWARE_ENA_SET(1) |
+	       ANA_VLAN_CFG_VLAN_POP_CNT_SET(1),
+	       lan966x, ANA_VLAN_CFG(CPU_PORT));
+
+	/* Set vlan ingress filter mask to all ports */
+	lan_wr(GENMASK(lan966x->num_phys_ports, 0),
+	       lan966x, ANA_VLANMASK);
+
+	for (port = 0; port < lan966x->num_phys_ports; port++) {
+		lan_wr(0, lan966x, REW_PORT_VLAN_CFG(port));
+		lan_wr(0, lan966x, REW_TAG_CFG(port));
+	}
+}