net: dsa: felix: support FDB entries on offloaded LAG interfaces

This adds the logic in the Felix DSA driver and Ocelot switch library.
For Ocelot switches, the DEST_IDX that is the output of the MAC table
lookup is a logical port (equal to physical port, if no LAG is used, or
a dynamically allocated number otherwise). The allocation we have in
place for LAG IDs is different from DSA's, so we can't use that:
- DSA allocates a continuous range of LAG IDs starting from 1
- Ocelot appears to require that physical ports and LAG IDs are in the
  same space of [0, num_phys_ports), and additionally, ports that aren't
  in a LAG must have physical port id == logical port id

The implication is that an FDB entry towards a LAG might need to be
deleted and reinstalled when the LAG ID changes.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index 6d483887af04..9959407fede8 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -614,6 +614,22 @@ static int felix_fdb_del(struct dsa_switch *ds, int port,
 	return ocelot_fdb_del(ocelot, port, addr, vid);
 }
 
+static int felix_lag_fdb_add(struct dsa_switch *ds, struct dsa_lag lag,
+			     const unsigned char *addr, u16 vid)
+{
+	struct ocelot *ocelot = ds->priv;
+
+	return ocelot_lag_fdb_add(ocelot, lag.dev, addr, vid);
+}
+
+static int felix_lag_fdb_del(struct dsa_switch *ds, struct dsa_lag lag,
+			     const unsigned char *addr, u16 vid)
+{
+	struct ocelot *ocelot = ds->priv;
+
+	return ocelot_lag_fdb_del(ocelot, lag.dev, addr, vid);
+}
+
 static int felix_mdb_add(struct dsa_switch *ds, int port,
 			 const struct switchdev_obj_port_mdb *mdb)
 {
@@ -1579,6 +1595,8 @@ const struct dsa_switch_ops felix_switch_ops = {
 	.port_fdb_dump			= felix_fdb_dump,
 	.port_fdb_add			= felix_fdb_add,
 	.port_fdb_del			= felix_fdb_del,
+	.lag_fdb_add			= felix_lag_fdb_add,
+	.lag_fdb_del			= felix_lag_fdb_del,
 	.port_mdb_add			= felix_mdb_add,
 	.port_mdb_del			= felix_mdb_del,
 	.port_pre_bridge_flags		= felix_pre_bridge_flags,