[PATCH net-next v4 0/8] net: lan966x: Add lag support

[PATCH net-next v4 0/8] net: lan966x: Add lag support

[Horatiu Vultur]

Add lag support for lan966x.
First 4 patches don't do any changes to the current behaviour, they
just prepare for lag support. While the rest is to add the lag support.

v3->v4:
- aggregation configuration is global for all bonds, so make sure that
  there can't be enabled multiple configurations at the same time
- return error faster from lan966x_foreign_bridging_check, don't
  continue the search if the error is seen already
- flush fdb workqueue when a port leaves a bridge or lag.

v2->v3:
- return error code from 'switchdev_bridge_port_offload()'
- fix lan966x_foreign_dev_check(), it was missing lag support
- remove lan966x_lag_mac_add_entry and lan966x_mac_del_entry as
  they are not needed
- fix race conditions when accessing port->bond
- move FDB entries when a new port joins the lag if it has a lower

v1->v2:
- fix the LAG PGIDs when ports go down, in this way is not
  needed anymore the last patch of the series.

Horatiu Vultur (8):
  net: lan966x: Add registers used to configure lag interfaces
  net: lan966x: Split lan966x_fdb_event_work
  net: lan966x: Flush fdb workqueue when port is leaving a bridge.
  net: lan966x: Expose lan966x_switchdev_nb and
    lan966x_switchdev_blocking_nb
  net: lan966x: Extend lan966x_foreign_bridging_check
  net: lan966x: Add lag support for lan966x
  net: lan966x: Extend FDB to support also lag
  net: lan966x: Extend MAC to support also lag interfaces.

 .../net/ethernet/microchip/lan966x/Kconfig    |   1 +
 .../net/ethernet/microchip/lan966x/Makefile   |   2 +-
 .../ethernet/microchip/lan966x/lan966x_fdb.c  | 155 +++++---
 .../ethernet/microchip/lan966x/lan966x_lag.c  | 363 ++++++++++++++++++
 .../ethernet/microchip/lan966x/lan966x_mac.c  | 104 ++++-
 .../ethernet/microchip/lan966x/lan966x_main.h |  39 ++
 .../ethernet/microchip/lan966x/lan966x_regs.h |  45 +++
 .../microchip/lan966x/lan966x_switchdev.c     | 138 +++++--
 8 files changed, 741 insertions(+), 106 deletions(-)
 create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_lag.c

-- 
2.33.0

[PATCH net-next v4 1/8] net: lan966x: Add registers used to configure lag interfaces

[Horatiu Vultur]

Add the registers used by lan966x to configure the lag interface.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../ethernet/microchip/lan966x/lan966x_regs.h | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
index 8265ad89f0bc..69eedff28ce3 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_regs.h
@@ -363,6 +363,51 @@ enum lan966x_target {
 #define ANA_PFC_CFG_FC_LINK_SPEED_GET(x)\
 	FIELD_GET(ANA_PFC_CFG_FC_LINK_SPEED, x)
 
+/*      ANA:COMMON:AGGR_CFG */
+#define ANA_AGGR_CFG              __REG(TARGET_ANA, 0, 1, 31232, 0, 1, 552, 0, 0, 1, 4)
+
+#define ANA_AGGR_CFG_AC_RND_ENA                  BIT(6)
+#define ANA_AGGR_CFG_AC_RND_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_RND_ENA, x)
+#define ANA_AGGR_CFG_AC_RND_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_RND_ENA, x)
+
+#define ANA_AGGR_CFG_AC_DMAC_ENA                 BIT(5)
+#define ANA_AGGR_CFG_AC_DMAC_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_DMAC_ENA, x)
+#define ANA_AGGR_CFG_AC_DMAC_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_DMAC_ENA, x)
+
+#define ANA_AGGR_CFG_AC_SMAC_ENA                 BIT(4)
+#define ANA_AGGR_CFG_AC_SMAC_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_SMAC_ENA, x)
+#define ANA_AGGR_CFG_AC_SMAC_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_SMAC_ENA, x)
+
+#define ANA_AGGR_CFG_AC_IP6_FLOW_LBL_ENA         BIT(3)
+#define ANA_AGGR_CFG_AC_IP6_FLOW_LBL_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_IP6_FLOW_LBL_ENA, x)
+#define ANA_AGGR_CFG_AC_IP6_FLOW_LBL_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_IP6_FLOW_LBL_ENA, x)
+
+#define ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA           BIT(2)
+#define ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA, x)
+#define ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA, x)
+
+#define ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA           BIT(1)
+#define ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA, x)
+#define ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA, x)
+
+#define ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA           BIT(0)
+#define ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(x)\
+	FIELD_PREP(ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA, x)
+#define ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_GET(x)\
+	FIELD_GET(ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA, x)
+
 /*      CHIP_TOP:CUPHY_CFG:CUPHY_PORT_CFG */
 #define CHIP_TOP_CUPHY_PORT_CFG(r) __REG(TARGET_CHIP_TOP, 0, 1, 16, 0, 1, 20, 8, r, 2, 4)
 
-- 
2.33.0

[PATCH net-next v4 2/8] net: lan966x: Split lan966x_fdb_event_work

[Horatiu Vultur]

Split the function lan966x_fdb_event_work. One case for when the
orig_dev is a bridge and one case when orig_dev is lan966x port.
This is preparation for lag support. There is no functional change.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../ethernet/microchip/lan966x/lan966x_fdb.c  | 124 ++++++++++--------
 1 file changed, 69 insertions(+), 55 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
index da5ca7188679..c760f73c0621 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
@@ -8,6 +8,7 @@ struct lan966x_fdb_event_work {
 	struct work_struct work;
 	struct switchdev_notifier_fdb_info fdb_info;
 	struct net_device *dev;
+	struct net_device *orig_dev;
 	struct lan966x *lan966x;
 	unsigned long event;
 };
@@ -127,75 +128,86 @@ void lan966x_fdb_deinit(struct lan966x *lan966x)
 	lan966x_fdb_purge_entries(lan966x);
 }
 
-static void lan966x_fdb_event_work(struct work_struct *work)
+static void lan966x_fdb_port_event_work(struct lan966x_fdb_event_work *fdb_work)
 {
-	struct lan966x_fdb_event_work *fdb_work =
-		container_of(work, struct lan966x_fdb_event_work, work);
 	struct switchdev_notifier_fdb_info *fdb_info;
-	struct net_device *dev = fdb_work->dev;
 	struct lan966x_port *port;
 	struct lan966x *lan966x;
-	int ret;
 
-	fdb_info = &fdb_work->fdb_info;
 	lan966x = fdb_work->lan966x;
+	port = netdev_priv(fdb_work->orig_dev);
+	fdb_info = &fdb_work->fdb_info;
 
-	if (lan966x_netdevice_check(dev)) {
-		port = netdev_priv(dev);
-
-		switch (fdb_work->event) {
-		case SWITCHDEV_FDB_ADD_TO_DEVICE:
-			if (!fdb_info->added_by_user)
-				break;
-			lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
-					      fdb_info->vid);
+	switch (fdb_work->event) {
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+		if (!fdb_info->added_by_user)
 			break;
-		case SWITCHDEV_FDB_DEL_TO_DEVICE:
-			if (!fdb_info->added_by_user)
-				break;
-			lan966x_mac_del_entry(lan966x, fdb_info->addr,
-					      fdb_info->vid);
+		lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		if (!fdb_info->added_by_user)
 			break;
-		}
-	} else {
-		if (!netif_is_bridge_master(dev))
-			goto out;
-
-		/* In case the bridge is called */
-		switch (fdb_work->event) {
-		case SWITCHDEV_FDB_ADD_TO_DEVICE:
-			/* If there is no front port in this vlan, there is no
-			 * point to copy the frame to CPU because it would be
-			 * just dropped at later point. So add it only if
-			 * there is a port but it is required to store the fdb
-			 * entry for later point when a port actually gets in
-			 * the vlan.
-			 */
-			lan966x_fdb_add_entry(lan966x, fdb_info);
-			if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
-								   fdb_info->vid))
-				break;
-
-			lan966x_mac_cpu_learn(lan966x, fdb_info->addr,
-					      fdb_info->vid);
+		lan966x_mac_del_entry(lan966x, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	}
+}
+
+static void lan966x_fdb_bridge_event_work(struct lan966x_fdb_event_work *fdb_work)
+{
+	struct switchdev_notifier_fdb_info *fdb_info;
+	struct lan966x *lan966x;
+	int ret;
+
+	lan966x = fdb_work->lan966x;
+	fdb_info = &fdb_work->fdb_info;
+
+	/* In case the bridge is called */
+	switch (fdb_work->event) {
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+		/* If there is no front port in this vlan, there is no
+		 * point to copy the frame to CPU because it would be
+		 * just dropped at later point. So add it only if
+		 * there is a port but it is required to store the fdb
+		 * entry for later point when a port actually gets in
+		 * the vlan.
+		 */
+		lan966x_fdb_add_entry(lan966x, fdb_info);
+		if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
+							   fdb_info->vid))
 			break;
-		case SWITCHDEV_FDB_DEL_TO_DEVICE:
-			ret = lan966x_fdb_del_entry(lan966x, fdb_info);
-			if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
-								   fdb_info->vid))
-				break;
-
-			if (ret)
-				lan966x_mac_cpu_forget(lan966x, fdb_info->addr,
-						       fdb_info->vid);
+
+		lan966x_mac_cpu_learn(lan966x, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		ret = lan966x_fdb_del_entry(lan966x, fdb_info);
+		if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
+							   fdb_info->vid))
 			break;
-		}
+
+		if (ret)
+			lan966x_mac_cpu_forget(lan966x, fdb_info->addr,
+					       fdb_info->vid);
+		break;
 	}
+}
+
+static void lan966x_fdb_event_work(struct work_struct *work)
+{
+	struct lan966x_fdb_event_work *fdb_work =
+		container_of(work, struct lan966x_fdb_event_work, work);
+
+	if (lan966x_netdevice_check(fdb_work->orig_dev))
+		lan966x_fdb_port_event_work(fdb_work);
+	else if (netif_is_bridge_master(fdb_work->orig_dev))
+		lan966x_fdb_bridge_event_work(fdb_work);
 
-out:
 	kfree(fdb_work->fdb_info.addr);
+	dev_put(fdb_work->dev);
+	dev_put(fdb_work->orig_dev);
 	kfree(fdb_work);
-	dev_put(dev);
 }
 
 int lan966x_handle_fdb(struct net_device *dev,
@@ -221,7 +233,8 @@ int lan966x_handle_fdb(struct net_device *dev,
 		if (!fdb_work)
 			return -ENOMEM;
 
-		fdb_work->dev = orig_dev;
+		fdb_work->dev = dev;
+		fdb_work->orig_dev = orig_dev;
 		fdb_work->lan966x = lan966x;
 		fdb_work->event = event;
 		INIT_WORK(&fdb_work->work, lan966x_fdb_event_work);
@@ -231,6 +244,7 @@ int lan966x_handle_fdb(struct net_device *dev,
 			goto err_addr_alloc;
 
 		ether_addr_copy((u8 *)fdb_work->fdb_info.addr, fdb_info->addr);
+		dev_hold(dev);
 		dev_hold(orig_dev);
 
 		queue_work(lan966x->fdb_work, &fdb_work->work);
-- 
2.33.0

[PATCH net-next v4 3/8] net: lan966x: Flush fdb workqueue when port is leaving a bridge.

[Horatiu Vultur]

Whenever a port leaves a bridge, flush the workqueue of the FDB work.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c     | 9 +++++----
 drivers/net/ethernet/microchip/lan966x/lan966x_main.h    | 1 +
 .../net/ethernet/microchip/lan966x/lan966x_switchdev.c   | 7 ++++---
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
index c760f73c0621..5142e7c0de31 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
@@ -128,6 +128,11 @@ void lan966x_fdb_deinit(struct lan966x *lan966x)
 	lan966x_fdb_purge_entries(lan966x);
 }
 
+void lan966x_fdb_flush_workqueue(struct lan966x *lan966x)
+{
+	flush_workqueue(lan966x->fdb_work);
+}
+
 static void lan966x_fdb_port_event_work(struct lan966x_fdb_event_work *fdb_work)
 {
 	struct switchdev_notifier_fdb_info *fdb_info;
@@ -205,8 +210,6 @@ static void lan966x_fdb_event_work(struct work_struct *work)
 		lan966x_fdb_bridge_event_work(fdb_work);
 
 	kfree(fdb_work->fdb_info.addr);
-	dev_put(fdb_work->dev);
-	dev_put(fdb_work->orig_dev);
 	kfree(fdb_work);
 }
 
@@ -244,8 +247,6 @@ int lan966x_handle_fdb(struct net_device *dev,
 			goto err_addr_alloc;
 
 		ether_addr_copy((u8 *)fdb_work->fdb_info.addr, fdb_info->addr);
-		dev_hold(dev);
-		dev_hold(orig_dev);
 
 		queue_work(lan966x->fdb_work, &fdb_work->work);
 		break;
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 2787055c1847..b02c1c803945 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -369,6 +369,7 @@ void lan966x_fdb_write_entries(struct lan966x *lan966x, u16 vid);
 void lan966x_fdb_erase_entries(struct lan966x *lan966x, u16 vid);
 int lan966x_fdb_init(struct lan966x *lan966x);
 void lan966x_fdb_deinit(struct lan966x *lan966x);
+void lan966x_fdb_flush_workqueue(struct lan966x *lan966x);
 int lan966x_handle_fdb(struct net_device *dev,
 		       struct net_device *orig_dev,
 		       unsigned long event, const void *ctx,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index df2bee678559..d9fc6a9a3da1 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -320,9 +320,10 @@ static int lan966x_port_prechangeupper(struct net_device *dev,
 {
 	struct lan966x_port *port = netdev_priv(dev);
 
-	if (netif_is_bridge_master(info->upper_dev) && !info->linking)
-		switchdev_bridge_port_unoffload(port->dev, port,
-						NULL, NULL);
+	if (netif_is_bridge_master(info->upper_dev) && !info->linking) {
+		switchdev_bridge_port_unoffload(port->dev, port, NULL, NULL);
+		lan966x_fdb_flush_workqueue(port->lan966x);
+	}
 
 	return NOTIFY_DONE;
 }
-- 
2.33.0

[PATCH net-next v4 4/8] net: lan966x: Expose lan966x_switchdev_nb and lan966x_switchdev_blocking_nb

[Horatiu Vultur]

Expose lan966x_switchdev_nb and lan966x_switchdev_blocking_nb to the
lan966x_main.h file because they will be needed by the lag driver.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_main.h      | 2 ++
 drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c | 6 ++----
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index b02c1c803945..516ed8e9183d 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -297,6 +297,8 @@ struct lan966x_port {
 extern const struct phylink_mac_ops lan966x_phylink_mac_ops;
 extern const struct phylink_pcs_ops lan966x_phylink_pcs_ops;
 extern const struct ethtool_ops lan966x_ethtool_ops;
+extern struct notifier_block lan966x_switchdev_nb __read_mostly;
+extern struct notifier_block lan966x_switchdev_blocking_nb __read_mostly;
 
 bool lan966x_netdevice_check(const struct net_device *dev);
 
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index d9fc6a9a3da1..d9b3ca5f6214 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -6,8 +6,6 @@
 #include "lan966x_main.h"
 
 static struct notifier_block lan966x_netdevice_nb __read_mostly;
-static struct notifier_block lan966x_switchdev_nb __read_mostly;
-static struct notifier_block lan966x_switchdev_blocking_nb __read_mostly;
 
 static void lan966x_port_set_mcast_ip_flood(struct lan966x_port *port,
 					    u32 pgid_ip)
@@ -572,11 +570,11 @@ static struct notifier_block lan966x_netdevice_nb __read_mostly = {
 	.notifier_call = lan966x_netdevice_event,
 };
 
-static struct notifier_block lan966x_switchdev_nb __read_mostly = {
+struct notifier_block lan966x_switchdev_nb __read_mostly = {
 	.notifier_call = lan966x_switchdev_event,
 };
 
-static struct notifier_block lan966x_switchdev_blocking_nb __read_mostly = {
+struct notifier_block lan966x_switchdev_blocking_nb __read_mostly = {
 	.notifier_call = lan966x_switchdev_blocking_event,
 };
 
-- 
2.33.0

[PATCH net-next v4 5/8] net: lan966x: Extend lan966x_foreign_bridging_check

[Horatiu Vultur]

Extend lan966x_foreign_bridging_check to check also if the upper
interface is a lag device. Don't allow a lan966x port to be part of a
lag if it has foreign interfaces.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../microchip/lan966x/lan966x_switchdev.c     | 32 ++++++++++++++-----
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index d9b3ca5f6214..c4951eeb6636 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -326,23 +326,25 @@ static int lan966x_port_prechangeupper(struct net_device *dev,
 	return NOTIFY_DONE;
 }
 
-static int lan966x_foreign_bridging_check(struct net_device *bridge,
+static int lan966x_foreign_bridging_check(struct net_device *upper,
+					  bool *has_foreign,
+					  bool *seen_lan966x,
 					  struct netlink_ext_ack *extack)
 {
 	struct lan966x *lan966x = NULL;
-	bool has_foreign = false;
 	struct net_device *dev;
 	struct list_head *iter;
 
-	if (!netif_is_bridge_master(bridge))
+	if (!netif_is_bridge_master(upper) &&
+	    !netif_is_lag_master(upper))
 		return 0;
 
-	netdev_for_each_lower_dev(bridge, dev, iter) {
+	netdev_for_each_lower_dev(upper, dev, iter) {
 		if (lan966x_netdevice_check(dev)) {
 			struct lan966x_port *port = netdev_priv(dev);
 
 			if (lan966x) {
-				/* Bridge already has at least one port of a
+				/* Upper already has at least one port of a
 				 * lan966x switch inside it, check that it's
 				 * the same instance of the driver.
 				 */
@@ -353,15 +355,24 @@ static int lan966x_foreign_bridging_check(struct net_device *bridge,
 				}
 			} else {
 				/* This is the first lan966x port inside this
-				 * bridge
+				 * upper device
 				 */
 				lan966x = port->lan966x;
+				*seen_lan966x = true;
 			}
+		} else if (netif_is_lag_master(dev)) {
+			/* Allow to have bond interfaces that have only lan966x
+			 * devices
+			 */
+			if (lan966x_foreign_bridging_check(dev, has_foreign,
+							   seen_lan966x,
+							   extack))
+				return -EINVAL;
 		} else {
-			has_foreign = true;
+			*has_foreign = true;
 		}
 
-		if (lan966x && has_foreign) {
+		if (*seen_lan966x && *has_foreign) {
 			NL_SET_ERR_MSG_MOD(extack,
 					   "Bridging lan966x ports with foreign interfaces disallowed");
 			return -EINVAL;
@@ -374,7 +385,12 @@ static int lan966x_foreign_bridging_check(struct net_device *bridge,
 static int lan966x_bridge_check(struct net_device *dev,
 				struct netdev_notifier_changeupper_info *info)
 {
+	bool has_foreign = false;
+	bool seen_lan966x = false;
+
 	return lan966x_foreign_bridging_check(info->upper_dev,
+					      &has_foreign,
+					      &seen_lan966x,
 					      info->info.extack);
 }
 
-- 
2.33.0

[PATCH net-next v4 6/8] net: lan966x: Add lag support for lan966x

[Horatiu Vultur]

Add link aggregation hardware offload support for lan966x

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../net/ethernet/microchip/lan966x/Kconfig    |   1 +
 .../net/ethernet/microchip/lan966x/Makefile   |   2 +-
 .../ethernet/microchip/lan966x/lan966x_lag.c  | 337 ++++++++++++++++++
 .../ethernet/microchip/lan966x/lan966x_main.h |  31 ++
 .../microchip/lan966x/lan966x_switchdev.c     |  92 ++++-
 5 files changed, 443 insertions(+), 20 deletions(-)
 create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_lag.c

diff --git a/drivers/net/ethernet/microchip/lan966x/Kconfig b/drivers/net/ethernet/microchip/lan966x/Kconfig
index 4241ff0e5098..49e1464a4313 100644
--- a/drivers/net/ethernet/microchip/lan966x/Kconfig
+++ b/drivers/net/ethernet/microchip/lan966x/Kconfig
@@ -4,6 +4,7 @@ config LAN966X_SWITCH
 	depends on HAS_IOMEM
 	depends on OF
 	depends on NET_SWITCHDEV
+	depends on BRIDGE || BRIDGE=n
 	select PHYLINK
 	select PACKING
 	help
diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile
index fd2e0ebb2427..0c22c86bdaa9 100644
--- a/drivers/net/ethernet/microchip/lan966x/Makefile
+++ b/drivers/net/ethernet/microchip/lan966x/Makefile
@@ -8,4 +8,4 @@ obj-$(CONFIG_LAN966X_SWITCH) += lan966x-switch.o
 lan966x-switch-objs  := lan966x_main.o lan966x_phylink.o lan966x_port.o \
 			lan966x_mac.o lan966x_ethtool.o lan966x_switchdev.o \
 			lan966x_vlan.o lan966x_fdb.o lan966x_mdb.o \
-			lan966x_ptp.o lan966x_fdma.o
+			lan966x_ptp.o lan966x_fdma.o lan966x_lag.o
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
new file mode 100644
index 000000000000..e214e8e50723
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/if_bridge.h>
+
+#include "lan966x_main.h"
+
+static void lan966x_lag_set_aggr_pgids(struct lan966x *lan966x)
+{
+	u32 visited = GENMASK(lan966x->num_phys_ports - 1, 0);
+	int p, lag, i;
+
+	/* Reset destination and aggregation PGIDS */
+	for (p = 0; p < lan966x->num_phys_ports; ++p)
+		lan_wr(ANA_PGID_PGID_SET(BIT(p)),
+		       lan966x, ANA_PGID(p));
+
+	for (p = PGID_AGGR; p < PGID_SRC; ++p)
+		lan_wr(ANA_PGID_PGID_SET(visited),
+		       lan966x, ANA_PGID(p));
+
+	/* The visited ports bitmask holds the list of ports offloading any
+	 * bonding interface. Initially we mark all these ports as unvisited,
+	 * then every time we visit a port in this bitmask, we know that it is
+	 * the lowest numbered port, i.e. the one whose logical ID == physical
+	 * port ID == LAG ID. So we mark as visited all further ports in the
+	 * bitmask that are offloading the same bonding interface. This way,
+	 * we set up the aggregation PGIDs only once per bonding interface.
+	 */
+	for (p = 0; p < lan966x->num_phys_ports; ++p) {
+		struct lan966x_port *port = lan966x->ports[p];
+
+		if (!port || !port->bond)
+			continue;
+
+		visited &= ~BIT(p);
+	}
+
+	/* Now, set PGIDs for each active LAG */
+	for (lag = 0; lag < lan966x->num_phys_ports; ++lag) {
+		struct net_device *bond = lan966x->ports[lag]->bond;
+		int num_active_ports = 0;
+		unsigned long bond_mask;
+		u8 aggr_idx[16];
+
+		if (!bond || (visited & BIT(lag)))
+			continue;
+
+		bond_mask = lan966x_lag_get_mask(lan966x, bond);
+
+		for_each_set_bit(p, &bond_mask, lan966x->num_phys_ports) {
+			struct lan966x_port *port = lan966x->ports[p];
+
+			lan_wr(ANA_PGID_PGID_SET(bond_mask),
+			       lan966x, ANA_PGID(p));
+			if (port->lag_tx_active)
+				aggr_idx[num_active_ports++] = p;
+		}
+
+		for (i = PGID_AGGR; i < PGID_SRC; ++i) {
+			u32 ac;
+
+			ac = lan_rd(lan966x, ANA_PGID(i));
+			ac &= ~bond_mask;
+			/* Don't do division by zero if there was no active
+			 * port. Just make all aggregation codes zero.
+			 */
+			if (num_active_ports)
+				ac |= BIT(aggr_idx[i % num_active_ports]);
+			lan_wr(ANA_PGID_PGID_SET(ac),
+			       lan966x, ANA_PGID(i));
+		}
+
+		/* Mark all ports in the same LAG as visited to avoid applying
+		 * the same config again.
+		 */
+		for (p = lag; p < lan966x->num_phys_ports; p++) {
+			struct lan966x_port *port = lan966x->ports[p];
+
+			if (!port)
+				continue;
+
+			if (port->bond == bond)
+				visited |= BIT(p);
+		}
+	}
+}
+
+static void lan966x_lag_set_port_ids(struct lan966x *lan966x)
+{
+	struct lan966x_port *port;
+	u32 bond_mask;
+	u32 lag_id;
+	int p;
+
+	for (p = 0; p < lan966x->num_phys_ports; ++p) {
+		port = lan966x->ports[p];
+		if (!port)
+			continue;
+
+		lag_id = port->chip_port;
+
+		bond_mask = lan966x_lag_get_mask(lan966x, port->bond);
+		if (bond_mask)
+			lag_id = __ffs(bond_mask);
+
+		lan_rmw(ANA_PORT_CFG_PORTID_VAL_SET(lag_id),
+			ANA_PORT_CFG_PORTID_VAL,
+			lan966x, ANA_PORT_CFG(port->chip_port));
+	}
+}
+
+static void lan966x_lag_update_ids(struct lan966x *lan966x)
+{
+	lan966x_lag_set_port_ids(lan966x);
+	lan966x_update_fwd_mask(lan966x);
+	lan966x_lag_set_aggr_pgids(lan966x);
+}
+
+int lan966x_lag_port_join(struct lan966x_port *port,
+			  struct net_device *brport_dev,
+			  struct net_device *bond,
+			  struct netlink_ext_ack *extack)
+{
+	struct lan966x *lan966x = port->lan966x;
+	struct net_device *dev = port->dev;
+	int err;
+
+	port->bond = bond;
+	lan966x_lag_update_ids(lan966x);
+
+	err = switchdev_bridge_port_offload(brport_dev, dev, port,
+					    &lan966x_switchdev_nb,
+					    &lan966x_switchdev_blocking_nb,
+					    false, extack);
+	if (err)
+		goto out;
+
+	lan966x_port_stp_state_set(port, br_port_get_stp_state(brport_dev));
+
+	return 0;
+
+out:
+	port->bond = NULL;
+	lan966x_lag_update_ids(lan966x);
+
+	return err;
+}
+
+void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond)
+{
+	struct lan966x *lan966x = port->lan966x;
+
+	port->bond = NULL;
+	lan966x_lag_update_ids(lan966x);
+	lan966x_port_stp_state_set(port, BR_STATE_FORWARDING);
+}
+
+static bool lan966x_lag_port_check_hash_types(struct lan966x *lan966x,
+					      enum netdev_lag_hash hash_type)
+{
+	int p;
+
+	for (p = 0; p < lan966x->num_phys_ports; ++p) {
+		struct lan966x_port *port = lan966x->ports[p];
+
+		if (!port || !port->bond)
+			continue;
+
+		if (port->hash_type != hash_type)
+			return false;
+	}
+
+	return true;
+}
+
+int lan966x_lag_port_prechangeupper(struct net_device *dev,
+				    struct netdev_notifier_changeupper_info *info)
+{
+	struct lan966x_port *port = netdev_priv(dev);
+	struct lan966x *lan966x = port->lan966x;
+	struct netdev_lag_upper_info *lui;
+	struct netlink_ext_ack *extack;
+
+	extack = netdev_notifier_info_to_extack(&info->info);
+	lui = info->upper_info;
+	if (!lui) {
+		port->hash_type = NETDEV_LAG_HASH_NONE;
+		return NOTIFY_DONE;
+	}
+
+	if (lui->tx_type != NETDEV_LAG_TX_TYPE_HASH) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "LAG device using unsupported Tx type");
+		return -EINVAL;
+	}
+
+	if (!lan966x_lag_port_check_hash_types(lan966x, lui->hash_type)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "LAG devices can have only the same hash_type");
+		return -EINVAL;
+	}
+
+	switch (lui->hash_type) {
+	case NETDEV_LAG_HASH_L2:
+		lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) |
+		       ANA_AGGR_CFG_AC_SMAC_ENA_SET(1),
+		       lan966x, ANA_AGGR_CFG);
+		break;
+	case NETDEV_LAG_HASH_L34:
+		lan_wr(ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) |
+		       ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1) |
+		       ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA_SET(1),
+		       lan966x, ANA_AGGR_CFG);
+		break;
+	case NETDEV_LAG_HASH_L23:
+		lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) |
+		       ANA_AGGR_CFG_AC_SMAC_ENA_SET(1) |
+		       ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) |
+		       ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1),
+		       lan966x, ANA_AGGR_CFG);
+		break;
+	default:
+		NL_SET_ERR_MSG_MOD(extack,
+				   "LAG device using unsupported hash type");
+		return -EINVAL;
+	}
+
+	port->hash_type = lui->hash_type;
+
+	return NOTIFY_OK;
+}
+
+int lan966x_lag_port_changelowerstate(struct net_device *dev,
+				      struct netdev_notifier_changelowerstate_info *info)
+{
+	struct netdev_lag_lower_state_info *lag = info->lower_state_info;
+	struct lan966x_port *port = netdev_priv(dev);
+	struct lan966x *lan966x = port->lan966x;
+	bool is_active;
+
+	if (!port->bond)
+		return NOTIFY_DONE;
+
+	is_active = lag->link_up && lag->tx_enabled;
+	if (port->lag_tx_active == is_active)
+		return NOTIFY_DONE;
+
+	port->lag_tx_active = is_active;
+	lan966x_lag_set_aggr_pgids(lan966x);
+
+	return NOTIFY_OK;
+}
+
+int lan966x_lag_netdev_prechangeupper(struct net_device *dev,
+				      struct netdev_notifier_changeupper_info *info)
+{
+	struct lan966x_port *port;
+	struct net_device *lower;
+	struct list_head *iter;
+	int err;
+
+	netdev_for_each_lower_dev(dev, lower, iter) {
+		if (!lan966x_netdevice_check(lower))
+			continue;
+
+		port = netdev_priv(lower);
+		if (port->bond != dev)
+			continue;
+
+		err = lan966x_port_prechangeupper(lower, dev, info);
+		if (err)
+			return err;
+	}
+
+	return NOTIFY_DONE;
+}
+
+int lan966x_lag_netdev_changeupper(struct net_device *dev,
+				   struct netdev_notifier_changeupper_info *info)
+{
+	struct lan966x_port *port;
+	struct net_device *lower;
+	struct list_head *iter;
+	int err;
+
+	netdev_for_each_lower_dev(dev, lower, iter) {
+		if (!lan966x_netdevice_check(lower))
+			continue;
+
+		port = netdev_priv(lower);
+		if (port->bond != dev)
+			continue;
+
+		err = lan966x_port_changeupper(lower, dev, info);
+		if (err)
+			return err;
+	}
+
+	return NOTIFY_DONE;
+}
+
+bool lan966x_lag_first_port(struct net_device *lag, struct net_device *dev)
+{
+	struct lan966x_port *port = netdev_priv(dev);
+	struct lan966x *lan966x = port->lan966x;
+	unsigned long bond_mask;
+
+	if (port->bond != lag)
+		return false;
+
+	bond_mask = lan966x_lag_get_mask(lan966x, lag);
+	if (bond_mask && port->chip_port == __ffs(bond_mask))
+		return true;
+
+	return false;
+}
+
+u32 lan966x_lag_get_mask(struct lan966x *lan966x, struct net_device *bond)
+{
+	struct lan966x_port *port;
+	u32 mask = 0;
+	int p;
+
+	if (!bond)
+		return mask;
+
+	for (p = 0; p < lan966x->num_phys_ports; p++) {
+		port = lan966x->ports[p];
+		if (!port)
+			continue;
+
+		if (port->bond == bond)
+			mask |= BIT(p);
+	}
+
+	return mask;
+}
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 516ed8e9183d..96182ae0df3e 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -292,6 +292,10 @@ struct lan966x_port {
 	u8 ptp_cmd;
 	u16 ts_id;
 	struct sk_buff_head tx_skbs;
+
+	struct net_device *bond;
+	bool lag_tx_active;
+	enum netdev_lag_hash hash_type;
 };
 
 extern const struct phylink_mac_ops lan966x_phylink_mac_ops;
@@ -409,6 +413,33 @@ int lan966x_fdma_init(struct lan966x *lan966x);
 void lan966x_fdma_deinit(struct lan966x *lan966x);
 irqreturn_t lan966x_fdma_irq_handler(int irq, void *args);
 
+int lan966x_lag_port_join(struct lan966x_port *port,
+			  struct net_device *brport_dev,
+			  struct net_device *bond,
+			  struct netlink_ext_ack *extack);
+void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond);
+int lan966x_lag_port_prechangeupper(struct net_device *dev,
+				    struct netdev_notifier_changeupper_info *info);
+int lan966x_lag_port_changelowerstate(struct net_device *dev,
+				      struct netdev_notifier_changelowerstate_info *info);
+int lan966x_lag_netdev_prechangeupper(struct net_device *dev,
+				      struct netdev_notifier_changeupper_info *info);
+int lan966x_lag_netdev_changeupper(struct net_device *dev,
+				   struct netdev_notifier_changeupper_info *info);
+bool lan966x_lag_first_port(struct net_device *lag, struct net_device *dev);
+u32 lan966x_lag_get_mask(struct lan966x *lan966x, struct net_device *bond);
+
+int lan966x_port_changeupper(struct net_device *dev,
+			     struct net_device *brport_dev,
+			     struct netdev_notifier_changeupper_info *info);
+int lan966x_port_prechangeupper(struct net_device *dev,
+				struct net_device *brport_dev,
+				struct netdev_notifier_changeupper_info *info);
+void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state);
+void lan966x_port_ageing_set(struct lan966x_port *port,
+			     unsigned long ageing_clock_t);
+void lan966x_update_fwd_mask(struct lan966x *lan966x);
+
 static inline void __iomem *lan_addr(void __iomem *base[],
 				     int id, int tinst, int tcnt,
 				     int gbase, int ginst,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index c4951eeb6636..5bf574111bce 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -130,7 +130,7 @@ static int lan966x_port_pre_bridge_flags(struct lan966x_port *port,
 	return 0;
 }
 
-static void lan966x_update_fwd_mask(struct lan966x *lan966x)
+void lan966x_update_fwd_mask(struct lan966x *lan966x)
 {
 	int i;
 
@@ -138,9 +138,14 @@ static void lan966x_update_fwd_mask(struct lan966x *lan966x)
 		struct lan966x_port *port = lan966x->ports[i];
 		unsigned long mask = 0;
 
-		if (port && lan966x->bridge_fwd_mask & BIT(i))
+		if (port && lan966x->bridge_fwd_mask & BIT(i)) {
 			mask = lan966x->bridge_fwd_mask & ~BIT(i);
 
+			if (port->bond)
+				mask &= ~lan966x_lag_get_mask(lan966x,
+							      port->bond);
+		}
+
 		mask |= BIT(CPU_PORT);
 
 		lan_wr(ANA_PGID_PGID_SET(mask),
@@ -148,7 +153,7 @@ static void lan966x_update_fwd_mask(struct lan966x *lan966x)
 	}
 }
 
-static void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
+void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
 {
 	struct lan966x *lan966x = port->lan966x;
 	bool learn_ena = false;
@@ -169,8 +174,8 @@ static void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
 	lan966x_update_fwd_mask(lan966x);
 }
 
-static void lan966x_port_ageing_set(struct lan966x_port *port,
-				    unsigned long ageing_clock_t)
+void lan966x_port_ageing_set(struct lan966x_port *port,
+			     unsigned long ageing_clock_t)
 {
 	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock_t);
 	u32 ageing_time = jiffies_to_msecs(ageing_jiffies) / 1000;
@@ -239,6 +244,7 @@ static int lan966x_port_attr_set(struct net_device *dev, const void *ctx,
 }
 
 static int lan966x_port_bridge_join(struct lan966x_port *port,
+				    struct net_device *brport_dev,
 				    struct net_device *bridge,
 				    struct netlink_ext_ack *extack)
 {
@@ -256,7 +262,7 @@ static int lan966x_port_bridge_join(struct lan966x_port *port,
 		}
 	}
 
-	err = switchdev_bridge_port_offload(dev, dev, port,
+	err = switchdev_bridge_port_offload(brport_dev, dev, port,
 					    &lan966x_switchdev_nb,
 					    &lan966x_switchdev_blocking_nb,
 					    false, extack);
@@ -293,8 +299,9 @@ static void lan966x_port_bridge_leave(struct lan966x_port *port,
 	lan966x_vlan_port_apply(port);
 }
 
-static int lan966x_port_changeupper(struct net_device *dev,
-				    struct netdev_notifier_changeupper_info *info)
+int lan966x_port_changeupper(struct net_device *dev,
+			     struct net_device *brport_dev,
+			     struct netdev_notifier_changeupper_info *info)
 {
 	struct lan966x_port *port = netdev_priv(dev);
 	struct netlink_ext_ack *extack;
@@ -304,26 +311,46 @@ static int lan966x_port_changeupper(struct net_device *dev,
 
 	if (netif_is_bridge_master(info->upper_dev)) {
 		if (info->linking)
-			err = lan966x_port_bridge_join(port, info->upper_dev,
+			err = lan966x_port_bridge_join(port, brport_dev,
+						       info->upper_dev,
 						       extack);
 		else
 			lan966x_port_bridge_leave(port, info->upper_dev);
 	}
 
+	if (netif_is_lag_master(info->upper_dev)) {
+		if (info->linking)
+			err = lan966x_lag_port_join(port, info->upper_dev,
+						    info->upper_dev,
+						    extack);
+		else
+			lan966x_lag_port_leave(port, info->upper_dev);
+	}
+
 	return err;
 }
 
-static int lan966x_port_prechangeupper(struct net_device *dev,
-				       struct netdev_notifier_changeupper_info *info)
+int lan966x_port_prechangeupper(struct net_device *dev,
+				struct net_device *brport_dev,
+				struct netdev_notifier_changeupper_info *info)
 {
 	struct lan966x_port *port = netdev_priv(dev);
+	int err = NOTIFY_DONE;
 
 	if (netif_is_bridge_master(info->upper_dev) && !info->linking) {
 		switchdev_bridge_port_unoffload(port->dev, port, NULL, NULL);
 		lan966x_fdb_flush_workqueue(port->lan966x);
 	}
 
-	return NOTIFY_DONE;
+	if (netif_is_lag_master(info->upper_dev)) {
+		err = lan966x_lag_port_prechangeupper(dev, info);
+		if (err || info->linking)
+			return err;
+
+		switchdev_bridge_port_unoffload(brport_dev, port, NULL, NULL);
+	}
+
+	return err;
 }
 
 static int lan966x_foreign_bridging_check(struct net_device *upper,
@@ -401,21 +428,44 @@ static int lan966x_netdevice_port_event(struct net_device *dev,
 	int err = 0;
 
 	if (!lan966x_netdevice_check(dev)) {
-		if (event == NETDEV_CHANGEUPPER)
-			return lan966x_bridge_check(dev, ptr);
+		switch (event) {
+		case NETDEV_CHANGEUPPER:
+		case NETDEV_PRECHANGEUPPER:
+			err = lan966x_bridge_check(dev, ptr);
+			if (err)
+				return err;
+
+			if (netif_is_lag_master(dev)) {
+				if (event == NETDEV_CHANGEUPPER)
+					err = lan966x_lag_netdev_changeupper(dev,
+									     ptr);
+				else
+					err = lan966x_lag_netdev_prechangeupper(dev,
+										ptr);
+
+				return err;
+			}
+			break;
+		default:
+			return 0;
+		}
+
 		return 0;
 	}
 
 	switch (event) {
 	case NETDEV_PRECHANGEUPPER:
-		err = lan966x_port_prechangeupper(dev, ptr);
+		err = lan966x_port_prechangeupper(dev, dev, ptr);
 		break;
 	case NETDEV_CHANGEUPPER:
 		err = lan966x_bridge_check(dev, ptr);
 		if (err)
 			return err;
 
-		err = lan966x_port_changeupper(dev, ptr);
+		err = lan966x_port_changeupper(dev, dev, ptr);
+		break;
+	case NETDEV_CHANGELOWERSTATE:
+		err = lan966x_lag_port_changelowerstate(dev, ptr);
 		break;
 	}
 
@@ -433,19 +483,23 @@ static int lan966x_netdevice_event(struct notifier_block *nb,
 	return notifier_from_errno(ret);
 }
 
-/* We don't offload uppers such as LAG as bridge ports, so every device except
- * the bridge itself is foreign.
- */
 static bool lan966x_foreign_dev_check(const struct net_device *dev,
 				      const struct net_device *foreign_dev)
 {
 	struct lan966x_port *port = netdev_priv(dev);
 	struct lan966x *lan966x = port->lan966x;
+	int i;
 
 	if (netif_is_bridge_master(foreign_dev))
 		if (lan966x->bridge == foreign_dev)
 			return false;
 
+	if (netif_is_lag_master(foreign_dev))
+		for (i = 0; i < lan966x->num_phys_ports; ++i)
+			if (lan966x->ports[i] &&
+			    lan966x->ports[i]->bond == foreign_dev)
+				return false;
+
 	return true;
 }
 
-- 
2.33.0

[PATCH net-next v4 7/8] net: lan966x: Extend FDB to support also lag

[Horatiu Vultur]

Offload FDB entries when the original device is a lag interface. Because
all the ports under the lag have the same chip id, which is the chip id
of first port, then add the entries only for the first port.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../ethernet/microchip/lan966x/lan966x_fdb.c  | 30 +++++++++++++++++++
 .../microchip/lan966x/lan966x_switchdev.c     |  1 +
 2 files changed, 31 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
index 5142e7c0de31..2ea263e893ee 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c
@@ -199,6 +199,34 @@ static void lan966x_fdb_bridge_event_work(struct lan966x_fdb_event_work *fdb_wor
 	}
 }
 
+static void lan966x_fdb_lag_event_work(struct lan966x_fdb_event_work *fdb_work)
+{
+	struct switchdev_notifier_fdb_info *fdb_info;
+	struct lan966x_port *port;
+	struct lan966x *lan966x;
+
+	if (!lan966x_lag_first_port(fdb_work->orig_dev, fdb_work->dev))
+		return;
+
+	lan966x = fdb_work->lan966x;
+	port = netdev_priv(fdb_work->dev);
+	fdb_info = &fdb_work->fdb_info;
+
+	switch (fdb_work->event) {
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+		if (!fdb_info->added_by_user)
+			break;
+		lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		if (!fdb_info->added_by_user)
+			break;
+		lan966x_mac_del_entry(lan966x, fdb_info->addr, fdb_info->vid);
+		break;
+	}
+}
+
 static void lan966x_fdb_event_work(struct work_struct *work)
 {
 	struct lan966x_fdb_event_work *fdb_work =
@@ -208,6 +236,8 @@ static void lan966x_fdb_event_work(struct work_struct *work)
 		lan966x_fdb_port_event_work(fdb_work);
 	else if (netif_is_bridge_master(fdb_work->orig_dev))
 		lan966x_fdb_bridge_event_work(fdb_work);
+	else if (netif_is_lag_master(fdb_work->orig_dev))
+		lan966x_fdb_lag_event_work(fdb_work);
 
 	kfree(fdb_work->fdb_info.addr);
 	kfree(fdb_work);
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index 5bf574111bce..1c88120eb291 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -348,6 +348,7 @@ int lan966x_port_prechangeupper(struct net_device *dev,
 			return err;
 
 		switchdev_bridge_port_unoffload(brport_dev, port, NULL, NULL);
+		lan966x_fdb_flush_workqueue(port->lan966x);
 	}
 
 	return err;
-- 
2.33.0

[PATCH net-next v4 8/8] net: lan966x: Extend MAC to support also lag interfaces.

[Horatiu Vultur]

Extend MAC support to support also lag interfaces:
1. In case an entry is learned on a port that is part of lag interface,
   then notify the upper layers that the entry is learned on the bond
   interface
2. If a port leaves the bond and the port is the first port in the lag
   group, then it is required to update all MAC entries to change the
   destination port.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../ethernet/microchip/lan966x/lan966x_lag.c  |  26 +++++
 .../ethernet/microchip/lan966x/lan966x_mac.c  | 104 +++++++++++++++---
 .../ethernet/microchip/lan966x/lan966x_main.h |   5 +
 3 files changed, 119 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
index e214e8e50723..41fa2523d91d 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c
@@ -123,8 +123,14 @@ int lan966x_lag_port_join(struct lan966x_port *port,
 {
 	struct lan966x *lan966x = port->lan966x;
 	struct net_device *dev = port->dev;
+	u32 lag_id = -1;
+	u32 bond_mask;
 	int err;
 
+	bond_mask = lan966x_lag_get_mask(lan966x, bond);
+	if (bond_mask)
+		lag_id = __ffs(bond_mask);
+
 	port->bond = bond;
 	lan966x_lag_update_ids(lan966x);
 
@@ -137,6 +143,12 @@ int lan966x_lag_port_join(struct lan966x_port *port,
 
 	lan966x_port_stp_state_set(port, br_port_get_stp_state(brport_dev));
 
+	if (lan966x_lag_first_port(port->bond, port->dev) &&
+	    lag_id != -1)
+		lan966x_mac_lag_replace_port_entry(lan966x,
+						   lan966x->ports[lag_id],
+						   port);
+
 	return 0;
 
 out:
@@ -149,6 +161,20 @@ int lan966x_lag_port_join(struct lan966x_port *port,
 void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond)
 {
 	struct lan966x *lan966x = port->lan966x;
+	u32 bond_mask;
+	u32 lag_id;
+
+	if (lan966x_lag_first_port(port->bond, port->dev)) {
+		bond_mask = lan966x_lag_get_mask(lan966x, port->bond);
+		bond_mask &= ~BIT(port->chip_port);
+		if (bond_mask) {
+			lag_id = __ffs(bond_mask);
+			lan966x_mac_lag_replace_port_entry(lan966x, port,
+							   lan966x->ports[lag_id]);
+		} else {
+			lan966x_mac_lag_remove_port_entry(lan966x, port);
+		}
+	}
 
 	port->bond = NULL;
 	lan966x_lag_update_ids(lan966x);
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
index 5893770bfd94..baa3a30c039f 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -22,6 +22,7 @@ struct lan966x_mac_entry {
 	u16 vid;
 	u16 port_index;
 	int row;
+	bool lag;
 };
 
 struct lan966x_mac_raw_entry {
@@ -69,15 +70,14 @@ static void lan966x_mac_select(struct lan966x *lan966x,
 	lan_wr(mach, lan966x, ANA_MACHDATA);
 }
 
-static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid,
-			       bool cpu_copy,
-			       const unsigned char mac[ETH_ALEN],
-			       unsigned int vid,
-			       enum macaccess_entry_type type)
+static int __lan966x_mac_learn_locked(struct lan966x *lan966x, int pgid,
+				      bool cpu_copy,
+				      const unsigned char mac[ETH_ALEN],
+				      unsigned int vid,
+				      enum macaccess_entry_type type)
 {
-	int ret;
+	lockdep_assert_held(&lan966x->mac_lock);
 
-	spin_lock(&lan966x->mac_lock);
 	lan966x_mac_select(lan966x, mac, vid);
 
 	/* Issue a write command */
@@ -89,7 +89,19 @@ static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid,
 	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_LEARN),
 	       lan966x, ANA_MACACCESS);
 
-	ret = lan966x_mac_wait_for_completion(lan966x);
+	return lan966x_mac_wait_for_completion(lan966x);
+}
+
+static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid,
+			       bool cpu_copy,
+			       const unsigned char mac[ETH_ALEN],
+			       unsigned int vid,
+			       enum macaccess_entry_type type)
+{
+	int ret;
+
+	spin_lock(&lan966x->mac_lock);
+	ret = __lan966x_mac_learn_locked(lan966x, pgid, cpu_copy, mac, vid, type);
 	spin_unlock(&lan966x->mac_lock);
 
 	return ret;
@@ -119,6 +131,16 @@ int lan966x_mac_learn(struct lan966x *lan966x, int port,
 	return __lan966x_mac_learn(lan966x, port, false, mac, vid, type);
 }
 
+static int lan966x_mac_learn_locked(struct lan966x *lan966x, int port,
+				    const unsigned char mac[ETH_ALEN],
+				    unsigned int vid,
+				    enum macaccess_entry_type type)
+{
+	WARN_ON(type != ENTRYTYPE_NORMAL && type != ENTRYTYPE_LOCKED);
+
+	return __lan966x_mac_learn_locked(lan966x, port, false, mac, vid, type);
+}
+
 static int lan966x_mac_forget_locked(struct lan966x *lan966x,
 				     const unsigned char mac[ETH_ALEN],
 				     unsigned int vid,
@@ -178,8 +200,9 @@ void lan966x_mac_init(struct lan966x *lan966x)
 	INIT_LIST_HEAD(&lan966x->mac_entries);
 }
 
-static struct lan966x_mac_entry *lan966x_mac_alloc_entry(const unsigned char *mac,
-							 u16 vid, u16 port_index)
+static struct lan966x_mac_entry *lan966x_mac_alloc_entry(struct lan966x_port *port,
+							 const unsigned char *mac,
+							 u16 vid)
 {
 	struct lan966x_mac_entry *mac_entry;
 
@@ -189,8 +212,9 @@ static struct lan966x_mac_entry *lan966x_mac_alloc_entry(const unsigned char *ma
 
 	memcpy(mac_entry->mac, mac, ETH_ALEN);
 	mac_entry->vid = vid;
-	mac_entry->port_index = port_index;
+	mac_entry->port_index = port->chip_port;
 	mac_entry->row = LAN966X_MAC_INVALID_ROW;
+	mac_entry->lag = port->bond ? true : false;
 	return mac_entry;
 }
 
@@ -269,7 +293,7 @@ int lan966x_mac_add_entry(struct lan966x *lan966x, struct lan966x_port *port,
 		goto mac_learn;
 	}
 
-	mac_entry = lan966x_mac_alloc_entry(addr, vid, port->chip_port);
+	mac_entry = lan966x_mac_alloc_entry(port, addr, vid);
 	if (!mac_entry) {
 		spin_unlock(&lan966x->mac_lock);
 		return -ENOMEM;
@@ -278,7 +302,8 @@ int lan966x_mac_add_entry(struct lan966x *lan966x, struct lan966x_port *port,
 	list_add_tail(&mac_entry->list, &lan966x->mac_entries);
 	spin_unlock(&lan966x->mac_lock);
 
-	lan966x_fdb_call_notifiers(SWITCHDEV_FDB_OFFLOADED, addr, vid, port->dev);
+	lan966x_fdb_call_notifiers(SWITCHDEV_FDB_OFFLOADED, addr, vid,
+				   port->bond ?: port->dev);
 
 mac_learn:
 	lan966x_mac_learn(lan966x, port->chip_port, addr, vid, ENTRYTYPE_LOCKED);
@@ -309,6 +334,50 @@ int lan966x_mac_del_entry(struct lan966x *lan966x, const unsigned char *addr,
 	return 0;
 }
 
+void lan966x_mac_lag_replace_port_entry(struct lan966x *lan966x,
+					struct lan966x_port *src,
+					struct lan966x_port *dst)
+{
+	struct lan966x_mac_entry *mac_entry;
+
+	spin_lock(&lan966x->mac_lock);
+	list_for_each_entry(mac_entry, &lan966x->mac_entries, list) {
+		if (mac_entry->port_index == src->chip_port &&
+		    mac_entry->lag) {
+			lan966x_mac_forget_locked(lan966x, mac_entry->mac,
+						  mac_entry->vid,
+						  ENTRYTYPE_LOCKED);
+
+			lan966x_mac_learn_locked(lan966x, dst->chip_port,
+						 mac_entry->mac, mac_entry->vid,
+						 ENTRYTYPE_LOCKED);
+			mac_entry->port_index = dst->chip_port;
+		}
+	}
+	spin_unlock(&lan966x->mac_lock);
+}
+
+void lan966x_mac_lag_remove_port_entry(struct lan966x *lan966x,
+				       struct lan966x_port *src)
+{
+	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->port_index == src->chip_port &&
+		    mac_entry->lag) {
+			lan966x_mac_forget_locked(lan966x, mac_entry->mac,
+						  mac_entry->vid,
+						  ENTRYTYPE_LOCKED);
+
+			list_del(&mac_entry->list);
+			kfree(mac_entry);
+		}
+	}
+	spin_unlock(&lan966x->mac_lock);
+}
+
 void lan966x_mac_purge_entries(struct lan966x *lan966x)
 {
 	struct lan966x_mac_entry *mac_entry, *tmp;
@@ -354,6 +423,7 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 	struct lan966x_mac_entry *mac_entry, *tmp;
 	unsigned char mac[ETH_ALEN] __aligned(2);
 	struct list_head mac_deleted_entries;
+	struct lan966x_port *port;
 	u32 dest_idx;
 	u32 column;
 	u16 vid;
@@ -406,9 +476,10 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 		/* Notify the bridge that the entry doesn't exist
 		 * anymore in the HW
 		 */
+		port = lan966x->ports[mac_entry->port_index];
 		lan966x_mac_notifiers(SWITCHDEV_FDB_DEL_TO_BRIDGE,
 				      mac_entry->mac, mac_entry->vid,
-				      lan966x->ports[mac_entry->port_index]->dev);
+				      port->bond ?: port->dev);
 		list_del(&mac_entry->list);
 		kfree(mac_entry);
 	}
@@ -440,7 +511,8 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 			continue;
 		}
 
-		mac_entry = lan966x_mac_alloc_entry(mac, vid, dest_idx);
+		port = lan966x->ports[dest_idx];
+		mac_entry = lan966x_mac_alloc_entry(port, mac, vid);
 		if (!mac_entry) {
 			spin_unlock(&lan966x->mac_lock);
 			return;
@@ -451,7 +523,7 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 		spin_unlock(&lan966x->mac_lock);
 
 		lan966x_mac_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE,
-				      mac, vid, lan966x->ports[dest_idx]->dev);
+				      mac, vid, port->bond ?: port->dev);
 	}
 }
 
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 96182ae0df3e..6135d311c407 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -351,6 +351,11 @@ int lan966x_mac_add_entry(struct lan966x *lan966x,
 			  struct lan966x_port *port,
 			  const unsigned char *addr,
 			  u16 vid);
+void lan966x_mac_lag_replace_port_entry(struct lan966x *lan966x,
+					struct lan966x_port *src,
+					struct lan966x_port *dst);
+void lan966x_mac_lag_remove_port_entry(struct lan966x *lan966x,
+				       struct lan966x_port *src);
 void lan966x_mac_purge_entries(struct lan966x *lan966x);
 irqreturn_t lan966x_mac_irq_handler(struct lan966x *lan966x);
 
-- 
2.33.0

Re: [PATCH net-next v4 0/8] net: lan966x: Add lag support

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Wed, 17 Aug 2022 21:34:41 +0200 you wrote:
> Add lag support for lan966x.
> First 4 patches don't do any changes to the current behaviour, they
> just prepare for lag support. While the rest is to add the lag support.
> 
> v3->v4:
> - aggregation configuration is global for all bonds, so make sure that
>   there can't be enabled multiple configurations at the same time
> - return error faster from lan966x_foreign_bridging_check, don't
>   continue the search if the error is seen already
> - flush fdb workqueue when a port leaves a bridge or lag.
> 
> [...]

Here is the summary with links:
  - [net-next,v4,1/8] net: lan966x: Add registers used to configure lag interfaces
    https://git.kernel.org/netdev/net-next/c/7c300735a1a1
  - [net-next,v4,2/8] net: lan966x: Split lan966x_fdb_event_work
    https://git.kernel.org/netdev/net-next/c/9b4ed7d262f3
  - [net-next,v4,3/8] net: lan966x: Flush fdb workqueue when port is leaving a bridge.
    https://git.kernel.org/netdev/net-next/c/86bac7f11788
  - [net-next,v4,4/8] net: lan966x: Expose lan966x_switchdev_nb and lan966x_switchdev_blocking_nb
    https://git.kernel.org/netdev/net-next/c/d6208adfc9a9
  - [net-next,v4,5/8] net: lan966x: Extend lan966x_foreign_bridging_check
    https://git.kernel.org/netdev/net-next/c/a751ea4d74e9
  - [net-next,v4,6/8] net: lan966x: Add lag support for lan966x
    https://git.kernel.org/netdev/net-next/c/cabc9d49333d
  - [net-next,v4,7/8] net: lan966x: Extend FDB to support also lag
    https://git.kernel.org/netdev/net-next/c/9be99f2d1d28
  - [net-next,v4,8/8] net: lan966x: Extend MAC to support also lag interfaces.
    https://git.kernel.org/netdev/net-next/c/e09ce97778e8

You are awesome, thank you!
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