mlxsw: spectrum_router: Support FID-less RIFs

Loopback RIFs, which will be introduced in a follow-up patch, differ
from other RIFs in that they do not have a FID associated with them.

To support this, demote FID allocation from mlxsw_sp_rif_create to
configure op of the existing RIF types, and likewise the FID release
from mlxsw_sp_rif_destroy to deconfigure op.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -4444,9 +4444,9 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 {
 	u32 tb_id = l3mdev_fib_table(params->dev);
 	const struct mlxsw_sp_rif_ops *ops;
+	struct mlxsw_sp_fid *fid = NULL;
 	enum mlxsw_sp_rif_type type;
 	struct mlxsw_sp_rif *rif;
-	struct mlxsw_sp_fid *fid;
 	struct mlxsw_sp_vr *vr;
 	u16 rif_index;
 	int err;
@@ -4470,12 +4470,14 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	rif->mlxsw_sp = mlxsw_sp;
 	rif->ops = ops;
 
-	fid = ops->fid_get(rif);
-	if (IS_ERR(fid)) {
-		err = PTR_ERR(fid);
-		goto err_fid_get;
+	if (ops->fid_get) {
+		fid = ops->fid_get(rif);
+		if (IS_ERR(fid)) {
+			err = PTR_ERR(fid);
+			goto err_fid_get;
+		}
+		rif->fid = fid;
 	}
-	rif->fid = fid;
 
 	if (ops->setup)
 		ops->setup(rif, params);
@@ -4484,22 +4486,15 @@ mlxsw_sp_rif_create(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		goto err_configure;
 
-	err = mlxsw_sp_rif_fdb_op(mlxsw_sp, params->dev->dev_addr,
-				  mlxsw_sp_fid_index(fid), true);
-	if (err)
-		goto err_rif_fdb_op;
-
 	mlxsw_sp_rif_counters_alloc(rif);
-	mlxsw_sp_fid_rif_set(fid, rif);
 	mlxsw_sp->router->rifs[rif_index] = rif;
 	vr->rif_count++;
 
 	return rif;
 
-err_rif_fdb_op:
-	ops->deconfigure(rif);
 err_configure:
-	mlxsw_sp_fid_put(fid);
+	if (fid)
+		mlxsw_sp_fid_put(fid);
 err_fid_get:
 	kfree(rif);
 err_rif_alloc:
@@ -4520,12 +4515,11 @@ void mlxsw_sp_rif_destroy(struct mlxsw_sp_rif *rif)
 
 	vr->rif_count--;
 	mlxsw_sp->router->rifs[rif->rif_index] = NULL;
-	mlxsw_sp_fid_rif_set(fid, NULL);
 	mlxsw_sp_rif_counters_free(rif);
-	mlxsw_sp_rif_fdb_op(mlxsw_sp, rif->dev->dev_addr,
-			    mlxsw_sp_fid_index(fid), false);
 	ops->deconfigure(rif);
-	mlxsw_sp_fid_put(fid);
+	if (fid)
+		/* Loopback RIFs are not associated with a FID. */
+		mlxsw_sp_fid_put(fid);
 	kfree(rif);
 	mlxsw_sp_vr_put(vr);
 }
@@ -4965,11 +4959,32 @@ static int mlxsw_sp_rif_subport_op(struct mlxsw_sp_rif *rif, bool enable)
 
 static int mlxsw_sp_rif_subport_configure(struct mlxsw_sp_rif *rif)
 {
-	return mlxsw_sp_rif_subport_op(rif, true);
+	int err;
+
+	err = mlxsw_sp_rif_subport_op(rif, true);
+	if (err)
+		return err;
+
+	err = mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+				  mlxsw_sp_fid_index(rif->fid), true);
+	if (err)
+		goto err_rif_fdb_op;
+
+	mlxsw_sp_fid_rif_set(rif->fid, rif);
+	return 0;
+
+err_rif_fdb_op:
+	mlxsw_sp_rif_subport_op(rif, false);
+	return err;
 }
 
 static void mlxsw_sp_rif_subport_deconfigure(struct mlxsw_sp_rif *rif)
 {
+	struct mlxsw_sp_fid *fid = rif->fid;
+
+	mlxsw_sp_fid_rif_set(fid, NULL);
+	mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+			    mlxsw_sp_fid_index(fid), false);
 	mlxsw_sp_rif_subport_op(rif, false);
 }
 
@@ -5028,8 +5043,17 @@ static int mlxsw_sp_rif_vlan_configure(struct mlxsw_sp_rif *rif)
 	if (err)
 		goto err_fid_bc_flood_set;
 
+	err = mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+				  mlxsw_sp_fid_index(rif->fid), true);
+	if (err)
+		goto err_rif_fdb_op;
+
+	mlxsw_sp_fid_rif_set(rif->fid, rif);
 	return 0;
 
+err_rif_fdb_op:
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
 err_fid_bc_flood_set:
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
@@ -5040,9 +5064,13 @@ static int mlxsw_sp_rif_vlan_configure(struct mlxsw_sp_rif *rif)
 
 static void mlxsw_sp_rif_vlan_deconfigure(struct mlxsw_sp_rif *rif)
 {
-	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
 	u16 vid = mlxsw_sp_fid_8021q_vid(rif->fid);
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	struct mlxsw_sp_fid *fid = rif->fid;
 
+	mlxsw_sp_fid_rif_set(fid, NULL);
+	mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+			    mlxsw_sp_fid_index(fid), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
@@ -5087,8 +5115,17 @@ static int mlxsw_sp_rif_fid_configure(struct mlxsw_sp_rif *rif)
 	if (err)
 		goto err_fid_bc_flood_set;
 
+	err = mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+				  mlxsw_sp_fid_index(rif->fid), true);
+	if (err)
+		goto err_rif_fdb_op;
+
+	mlxsw_sp_fid_rif_set(rif->fid, rif);
 	return 0;
 
+err_rif_fdb_op:
+	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
+			       mlxsw_sp_router_port(mlxsw_sp), false);
 err_fid_bc_flood_set:
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
@@ -5099,9 +5136,13 @@ static int mlxsw_sp_rif_fid_configure(struct mlxsw_sp_rif *rif)
 
 static void mlxsw_sp_rif_fid_deconfigure(struct mlxsw_sp_rif *rif)
 {
-	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
 	u16 fid_index = mlxsw_sp_fid_index(rif->fid);
+	struct mlxsw_sp *mlxsw_sp = rif->mlxsw_sp;
+	struct mlxsw_sp_fid *fid = rif->fid;
 
+	mlxsw_sp_fid_rif_set(fid, NULL);
+	mlxsw_sp_rif_fdb_op(rif->mlxsw_sp, rif->dev->dev_addr,
+			    mlxsw_sp_fid_index(fid), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_BC,
 			       mlxsw_sp_router_port(mlxsw_sp), false);
 	mlxsw_sp_fid_flood_set(rif->fid, MLXSW_SP_FLOOD_TYPE_MC,