1 files changed, 342 insertions, 0 deletions

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
index f6878b9f57ef..efadb8d326cc 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 
+#include <net/switchdev.h>
 #include "lan966x_main.h"
 
 #define LAN966X_MAC_COLUMNS		4
@@ -13,6 +14,23 @@
 #define MACACCESS_CMD_WRITE		7
 #define MACACCESS_CMD_SYNC_GET_NEXT	8
 
+#define LAN966X_MAC_INVALID_ROW		-1
+
+struct lan966x_mac_entry {
+	struct list_head list;
+	unsigned char mac[ETH_ALEN] __aligned(2);
+	u16 vid;
+	u16 port_index;
+	int row;
+};
+
+struct lan966x_mac_raw_entry {
+	u32 mach;
+	u32 macl;
+	u32 maca;
+	bool processed;
+};
+
 static int lan966x_mac_get_status(struct lan966x *lan966x)
 {
 	return lan_rd(lan966x, ANA_MACACCESS);
@@ -93,9 +111,333 @@ int lan966x_mac_cpu_forget(struct lan966x *lan966x, const char *addr, u16 vid)
 	return lan966x_mac_forget(lan966x, addr, vid, ENTRYTYPE_LOCKED);
 }
 
+void lan966x_mac_set_ageing(struct lan966x *lan966x,
+			    u32 ageing)
+{
+	lan_rmw(ANA_AUTOAGE_AGE_PERIOD_SET(ageing / 2),
+		ANA_AUTOAGE_AGE_PERIOD,
+		lan966x, ANA_AUTOAGE);
+}
+
 void lan966x_mac_init(struct lan966x *lan966x)
 {
 	/* Clear the MAC table */
 	lan_wr(MACACCESS_CMD_INIT, lan966x, ANA_MACACCESS);
 	lan966x_mac_wait_for_completion(lan966x);
+
+	spin_lock_init(&lan966x->mac_lock);
+	INIT_LIST_HEAD(&lan966x->mac_entries);
+}
+
+static struct lan966x_mac_entry *lan966x_mac_alloc_entry(const unsigned char *mac,
+							 u16 vid, u16 port_index)
+{
+	struct lan966x_mac_entry *mac_entry;
+
+	mac_entry = kzalloc(sizeof(*mac_entry), GFP_KERNEL);
+	if (!mac_entry)
+		return NULL;
+
+	memcpy(mac_entry->mac, mac, ETH_ALEN);
+	mac_entry->vid = vid;
+	mac_entry->port_index = port_index;
+	mac_entry->row = LAN966X_MAC_INVALID_ROW;
+	return mac_entry;
+}
+
+static struct lan966x_mac_entry *lan966x_mac_find_entry(struct lan966x *lan966x,
+							const unsigned char *mac,
+							u16 vid, u16 port_index)
+{
+	struct lan966x_mac_entry *res = NULL;
+	struct lan966x_mac_entry *mac_entry;
+
+	spin_lock(&lan966x->mac_lock);
+	list_for_each_entry(mac_entry, &lan966x->mac_entries, list) {
+		if (mac_entry->vid == vid &&
+		    ether_addr_equal(mac, mac_entry->mac) &&
+		    mac_entry->port_index == port_index) {
+			res = mac_entry;
+			break;
+		}
+	}
+	spin_unlock(&lan966x->mac_lock);
+
+	return res;
+}
+
+static int lan966x_mac_lookup(struct lan966x *lan966x,
+			      const unsigned char mac[ETH_ALEN],
+			      unsigned int vid, enum macaccess_entry_type type)
+{
+	int ret;
+
+	lan966x_mac_select(lan966x, mac, vid);
+
+	/* Issue a read command */
+	lan_wr(ANA_MACACCESS_ENTRYTYPE_SET(type) |
+	       ANA_MACACCESS_VALID_SET(1) |
+	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_READ),
+	       lan966x, ANA_MACACCESS);
+
+	ret = lan966x_mac_wait_for_completion(lan966x);
+	if (ret)
+		return ret;
+
+	return ANA_MACACCESS_VALID_GET(lan_rd(lan966x, ANA_MACACCESS));
+}
+
+static void lan966x_fdb_call_notifiers(enum switchdev_notifier_type type,
+				       const char *mac, u16 vid,
+				       struct net_device *dev)
+{
+	struct switchdev_notifier_fdb_info info = { 0 };
+
+	info.addr = mac;
+	info.vid = vid;
+	info.offloaded = true;
+	call_switchdev_notifiers(type, dev, &info.info, NULL);
+}
+
+int lan966x_mac_add_entry(struct lan966x *lan966x, struct lan966x_port *port,
+			  const unsigned char *addr, u16 vid)
+{
+	struct lan966x_mac_entry *mac_entry;
+
+	if (lan966x_mac_lookup(lan966x, addr, vid, ENTRYTYPE_NORMAL))
+		return 0;
+
+	/* In case the entry already exists, don't add it again to SW,
+	 * just update HW, but we need to look in the actual HW because
+	 * it is possible for an entry to be learn by HW and before we
+	 * get the interrupt the frame will reach CPU and the CPU will
+	 * add the entry but without the extern_learn flag.
+	 */
+	mac_entry = lan966x_mac_find_entry(lan966x, addr, vid, port->chip_port);
+	if (mac_entry)
+		return lan966x_mac_learn(lan966x, port->chip_port,
+					 addr, vid, ENTRYTYPE_LOCKED);
+
+	mac_entry = lan966x_mac_alloc_entry(addr, vid, port->chip_port);
+	if (!mac_entry)
+		return -ENOMEM;
+
+	spin_lock(&lan966x->mac_lock);
+	list_add_tail(&mac_entry->list, &lan966x->mac_entries);
+	spin_unlock(&lan966x->mac_lock);
+
+	lan966x_mac_learn(lan966x, port->chip_port, addr, vid, ENTRYTYPE_LOCKED);
+	lan966x_fdb_call_notifiers(SWITCHDEV_FDB_OFFLOADED, addr, vid, port->dev);
+
+	return 0;
+}
+
+int lan966x_mac_del_entry(struct lan966x *lan966x, const unsigned char *addr,
+			  u16 vid)
+{
+	struct lan966x_mac_entry *mac_entry, *tmp;
+
+	spin_lock(&lan966x->mac_lock);
+	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
+				 list) {
+		if (mac_entry->vid == vid &&
+		    ether_addr_equal(addr, mac_entry->mac)) {
+			lan966x_mac_forget(lan966x, mac_entry->mac, mac_entry->vid,
+					   ENTRYTYPE_LOCKED);
+
+			list_del(&mac_entry->list);
+			kfree(mac_entry);
+		}
+	}
+	spin_unlock(&lan966x->mac_lock);
+
+	return 0;
+}
+
+void lan966x_mac_purge_entries(struct lan966x *lan966x)
+{
+	struct lan966x_mac_entry *mac_entry, *tmp;
+
+	spin_lock(&lan966x->mac_lock);
+	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
+				 list) {
+		lan966x_mac_forget(lan966x, mac_entry->mac, mac_entry->vid,
+				   ENTRYTYPE_LOCKED);
+
+		list_del(&mac_entry->list);
+		kfree(mac_entry);
+	}
+	spin_unlock(&lan966x->mac_lock);
+}
+
+static void lan966x_mac_notifiers(enum switchdev_notifier_type type,
+				  unsigned char *mac, u32 vid,
+				  struct net_device *dev)
+{
+	rtnl_lock();
+	lan966x_fdb_call_notifiers(type, mac, vid, dev);
+	rtnl_unlock();
+}
+
+static void lan966x_mac_process_raw_entry(struct lan966x_mac_raw_entry *raw_entry,
+					  u8 *mac, u16 *vid, u32 *dest_idx)
+{
+	mac[0] = (raw_entry->mach >> 8)  & 0xff;
+	mac[1] = (raw_entry->mach >> 0)  & 0xff;
+	mac[2] = (raw_entry->macl >> 24) & 0xff;
+	mac[3] = (raw_entry->macl >> 16) & 0xff;
+	mac[4] = (raw_entry->macl >> 8)  & 0xff;
+	mac[5] = (raw_entry->macl >> 0)  & 0xff;
+
+	*vid = (raw_entry->mach >> 16) & 0xfff;
+	*dest_idx = ANA_MACACCESS_DEST_IDX_GET(raw_entry->maca);
+}
+
+static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
+				    struct lan966x_mac_raw_entry *raw_entries)
+{
+	struct lan966x_mac_entry *mac_entry, *tmp;
+	unsigned char mac[ETH_ALEN] __aligned(2);
+	u32 dest_idx;
+	u32 column;
+	u16 vid;
+
+	spin_lock(&lan966x->mac_lock);
+	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries, list) {
+		bool found = false;
+
+		if (mac_entry->row != row)
+			continue;
+
+		for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
+			/* All the valid entries are at the start of the row,
+			 * so when get one invalid entry it can just skip the
+			 * rest of the columns
+			 */
+			if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
+				break;
+
+			lan966x_mac_process_raw_entry(&raw_entries[column],
+						      mac, &vid, &dest_idx);
+			WARN_ON(dest_idx > lan966x->num_phys_ports);
+
+			/* If the entry in SW is found, then there is nothing
+			 * to do
+			 */
+			if (mac_entry->vid == vid &&
+			    ether_addr_equal(mac_entry->mac, mac) &&
+			    mac_entry->port_index == dest_idx) {
+				raw_entries[column].processed = true;
+				found = true;
+				break;
+			}
+		}
+
+		if (!found) {
+			/* Notify the bridge that the entry doesn't exist
+			 * anymore in the HW and remove the entry from the SW
+			 * list
+			 */
+			lan966x_mac_notifiers(SWITCHDEV_FDB_DEL_TO_BRIDGE,
+					      mac_entry->mac, mac_entry->vid,
+					      lan966x->ports[mac_entry->port_index]->dev);
+
+			list_del(&mac_entry->list);
+			kfree(mac_entry);
+		}
+	}
+	spin_unlock(&lan966x->mac_lock);
+
+	/* Now go to the list of columns and see if any entry was not in the SW
+	 * list, then that means that the entry is new so it needs to notify the
+	 * bridge.
+	 */
+	for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
+		/* All the valid entries are at the start of the row, so when
+		 * get one invalid entry it can just skip the rest of the columns
+		 */
+		if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
+			break;
+
+		/* If the entry already exists then don't do anything */
+		if (raw_entries[column].processed)
+			continue;
+
+		lan966x_mac_process_raw_entry(&raw_entries[column],
+					      mac, &vid, &dest_idx);
+		WARN_ON(dest_idx > lan966x->num_phys_ports);
+
+		mac_entry = lan966x_mac_alloc_entry(mac, vid, dest_idx);
+		if (!mac_entry)
+			return;
+
+		mac_entry->row = row;
+
+		spin_lock(&lan966x->mac_lock);
+		list_add_tail(&mac_entry->list, &lan966x->mac_entries);
+		spin_unlock(&lan966x->mac_lock);
+
+		lan966x_mac_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE,
+				      mac, vid, lan966x->ports[dest_idx]->dev);
+	}
+}
+
+irqreturn_t lan966x_mac_irq_handler(struct lan966x *lan966x)
+{
+	struct lan966x_mac_raw_entry entry[LAN966X_MAC_COLUMNS] = { 0 };
+	u32 index, column;
+	bool stop = true;
+	u32 val;
+
+	/* Start the scan from 0, 0 */
+	lan_wr(ANA_MACTINDX_M_INDEX_SET(0) |
+	       ANA_MACTINDX_BUCKET_SET(0),
+	       lan966x, ANA_MACTINDX);
+
+	while (1) {
+		lan_rmw(ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_SYNC_GET_NEXT),
+			ANA_MACACCESS_MAC_TABLE_CMD,
+			lan966x, ANA_MACACCESS);
+		lan966x_mac_wait_for_completion(lan966x);
+
+		val = lan_rd(lan966x, ANA_MACTINDX);
+		index = ANA_MACTINDX_M_INDEX_GET(val);
+		column = ANA_MACTINDX_BUCKET_GET(val);
+
+		/* The SYNC-GET-NEXT returns all the entries(4) in a row in
+		 * which is suffered a change. By change it means that new entry
+		 * was added or an entry was removed because of ageing.
+		 * It would return all the columns for that row. And after that
+		 * it would return the next row The stop conditions of the
+		 * SYNC-GET-NEXT is when it reaches 'directly' to row 0
+		 * column 3. So if SYNC-GET-NEXT returns row 0 and column 0
+		 * then it is required to continue to read more even if it
+		 * reaches row 0 and column 3.
+		 */
+		if (index == 0 && column == 0)
+			stop = false;
+
+		if (column == LAN966X_MAC_COLUMNS - 1 &&
+		    index == 0 && stop)
+			break;
+
+		entry[column].mach = lan_rd(lan966x, ANA_MACHDATA);
+		entry[column].macl = lan_rd(lan966x, ANA_MACLDATA);
+		entry[column].maca = lan_rd(lan966x, ANA_MACACCESS);
+
+		/* Once all the columns are read process them */
+		if (column == LAN966X_MAC_COLUMNS - 1) {
+			lan966x_mac_irq_process(lan966x, index, entry);
+			/* A row was processed so it is safe to assume that the
+			 * next row/column can be the stop condition
+			 */
+			stop = true;
+		}
+	}
+
+	lan_rmw(ANA_ANAINTR_INTR_SET(0),
+		ANA_ANAINTR_INTR,
+		lan966x, ANA_ANAINTR);
+
+	return IRQ_HANDLED;
 }