net: dsa: introduce a separate cross-chip notifier type for host FDBs

DSA treats some bridge FDB entries by trapping them to the CPU port.
Currently, the only class of such entries are FDB addresses learnt by
the software bridge on a foreign interface. However there are many more
to be added:

- FDB entries with the is_local flag (for termination) added by the
  bridge on the user ports (typically containing the MAC address of the
  bridge port)
- FDB entries pointing towards the bridge net device (for termination).
  Typically these contain the MAC address of the bridge net device.
- Static FDB entries installed on a foreign interface that is in the
  same bridge with a DSA user port.

The reason why a separate cross-chip notifier for host FDBs is justified
compared to normal FDBs is the same as in the case of host MDBs: the
cross-chip notifier matching function in switch.c should avoid
installing these entries on routing ports that route towards the
targeted switch, but not towards the CPU. This is required in order to
have proper support for H-like multi-chip topologies.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 90 insertions, 5 deletions

diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h
index cd65933d269b..36e667ea94db 100644
--- a/net/dsa/dsa_priv.h
+++ b/net/dsa/dsa_priv.h
@@ -20,6 +20,8 @@ enum {
 	DSA_NOTIFIER_BRIDGE_LEAVE,
 	DSA_NOTIFIER_FDB_ADD,
 	DSA_NOTIFIER_FDB_DEL,
+	DSA_NOTIFIER_HOST_FDB_ADD,
+	DSA_NOTIFIER_HOST_FDB_DEL,
 	DSA_NOTIFIER_HSR_JOIN,
 	DSA_NOTIFIER_HSR_LEAVE,
 	DSA_NOTIFIER_LAG_CHANGE,
@@ -121,6 +123,7 @@ struct dsa_switchdev_event_work {
 	 */
 	unsigned char addr[ETH_ALEN];
 	u16 vid;
+	bool host_addr;
 };
 
 /* DSA_NOTIFIER_HSR_* */
@@ -211,6 +214,10 @@ int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
 		     u16 vid);
 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 		     u16 vid);
+int dsa_port_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
+			  u16 vid);
+int dsa_port_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
+			  u16 vid);
 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data);
 int dsa_port_mdb_add(const struct dsa_port *dp,
 		     const struct switchdev_obj_port_mdb *mdb);
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 47f45f795f44..1b80e0fbdfaa 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -646,6 +646,32 @@ int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
 	return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
 }
 
+int dsa_port_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
+			  u16 vid)
+{
+	struct dsa_notifier_fdb_info info = {
+		.sw_index = dp->ds->index,
+		.port = dp->index,
+		.addr = addr,
+		.vid = vid,
+	};
+
+	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_ADD, &info);
+}
+
+int dsa_port_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
+			  u16 vid)
+{
+	struct dsa_notifier_fdb_info info = {
+		.sw_index = dp->ds->index,
+		.port = dp->index,
+		.addr = addr,
+		.vid = vid,
+	};
+
+	return dsa_port_notify(dp, DSA_NOTIFIER_HOST_FDB_DEL, &info);
+}
+
 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
 {
 	struct dsa_switch *ds = dp->ds;
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 4b1d738bc3bc..ac7f4f200ab1 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2315,8 +2315,12 @@ static void dsa_slave_switchdev_event_work(struct work_struct *work)
 	rtnl_lock();
 	switch (switchdev_work->event) {
 	case SWITCHDEV_FDB_ADD_TO_DEVICE:
-		err = dsa_port_fdb_add(dp, switchdev_work->addr,
-				       switchdev_work->vid);
+		if (switchdev_work->host_addr)
+			err = dsa_port_host_fdb_add(dp, switchdev_work->addr,
+						    switchdev_work->vid);
+		else
+			err = dsa_port_fdb_add(dp, switchdev_work->addr,
+					       switchdev_work->vid);
 		if (err) {
 			dev_err(ds->dev,
 				"port %d failed to add %pM vid %d to fdb: %d\n",
@@ -2328,8 +2332,12 @@ static void dsa_slave_switchdev_event_work(struct work_struct *work)
 		break;
 
 	case SWITCHDEV_FDB_DEL_TO_DEVICE:
-		err = dsa_port_fdb_del(dp, switchdev_work->addr,
-				       switchdev_work->vid);
+		if (switchdev_work->host_addr)
+			err = dsa_port_host_fdb_del(dp, switchdev_work->addr,
+						    switchdev_work->vid);
+		else
+			err = dsa_port_fdb_del(dp, switchdev_work->addr,
+					       switchdev_work->vid);
 		if (err) {
 			dev_err(ds->dev,
 				"port %d failed to delete %pM vid %d from fdb: %d\n",
@@ -2375,6 +2383,7 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
 	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
 	const struct switchdev_notifier_fdb_info *fdb_info;
 	struct dsa_switchdev_event_work *switchdev_work;
+	bool host_addr = false;
 	struct dsa_port *dp;
 	int err;
 
@@ -2412,7 +2421,8 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
 			if (!p)
 				return NOTIFY_DONE;
 
-			dp = p->dp->cpu_dp;
+			dp = p->dp;
+			host_addr = true;
 
 			if (!dp->ds->assisted_learning_on_cpu_port)
 				return NOTIFY_DONE;
@@ -2442,6 +2452,7 @@ static int dsa_slave_switchdev_event(struct notifier_block *unused,
 		ether_addr_copy(switchdev_work->addr,
 				fdb_info->addr);
 		switchdev_work->vid = fdb_info->vid;
+		switchdev_work->host_addr = host_addr;
 
 		/* Hold a reference on the slave for dsa_fdb_offload_notify */
 		if (dsa_is_user_port(dp->ds, dp->index))
diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index 5439de029485..219fc9baaa1c 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -253,6 +253,41 @@ static int dsa_switch_do_mdb_del(struct dsa_switch *ds, int port,
 	return 0;
 }
 
+static int dsa_switch_host_fdb_add(struct dsa_switch *ds,
+				   struct dsa_notifier_fdb_info *info)
+{
+	int err = 0;
+	int port;
+
+	if (!ds->ops->port_fdb_add)
+		return -EOPNOTSUPP;
+
+	for (port = 0; port < ds->num_ports; port++) {
+		if (dsa_switch_host_address_match(ds, port, info->sw_index,
+						  info->port)) {
+			err = ds->ops->port_fdb_add(ds, port, info->addr,
+						    info->vid);
+			if (err)
+				break;
+		}
+	}
+
+	return err;
+}
+
+static int dsa_switch_host_fdb_del(struct dsa_switch *ds,
+				   struct dsa_notifier_fdb_info *info)
+{
+	if (!ds->ops->port_fdb_del)
+		return -EOPNOTSUPP;
+
+	if (ds->index == info->sw_index)
+		return ds->ops->port_fdb_del(ds, info->port, info->addr,
+					     info->vid);
+
+	return 0;
+}
+
 static int dsa_switch_fdb_add(struct dsa_switch *ds,
 			      struct dsa_notifier_fdb_info *info)
 {
@@ -560,6 +595,12 @@ static int dsa_switch_event(struct notifier_block *nb,
 	case DSA_NOTIFIER_FDB_DEL:
 		err = dsa_switch_fdb_del(ds, info);
 		break;
+	case DSA_NOTIFIER_HOST_FDB_ADD:
+		err = dsa_switch_host_fdb_add(ds, info);
+		break;
+	case DSA_NOTIFIER_HOST_FDB_DEL:
+		err = dsa_switch_host_fdb_del(ds, info);
+		break;
 	case DSA_NOTIFIER_HSR_JOIN:
 		err = dsa_switch_hsr_join(ds, info);
 		break;