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>

1 files changed, 16 insertions, 5 deletions

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))