mlxsw: spectrum_router: Don't create FIB node during lookup

When looking up a FIB entry we shouldn't create the FIB node where it's
supposed to be linked in case the node doesn't already exist.

Instead, lookup the node and fail if it doesn't exist.
Signed-off-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

@@ -2314,8 +2314,8 @@ static void mlxsw_sp_fib4_entry_destroy(struct mlxsw_sp *mlxsw_sp,
 }
 
 static struct mlxsw_sp_fib_node *
-mlxsw_sp_fib4_node_get(struct mlxsw_sp *mlxsw_sp,
-		       const struct fib_entry_notifier_info *fen_info);
+mlxsw_sp_fib_node_lookup(struct mlxsw_sp_fib *fib, const void *addr,
+			 size_t addr_len, unsigned char prefix_len);
 
 static struct mlxsw_sp_fib_entry *
 mlxsw_sp_fib4_entry_lookup(struct mlxsw_sp *mlxsw_sp,
@@ -2323,9 +2323,18 @@ mlxsw_sp_fib4_entry_lookup(struct mlxsw_sp *mlxsw_sp,
 {
 	struct mlxsw_sp_fib_entry *fib_entry;
 	struct mlxsw_sp_fib_node *fib_node;
+	struct mlxsw_sp_fib *fib;
+	struct mlxsw_sp_vr *vr;
 
-	fib_node = mlxsw_sp_fib4_node_get(mlxsw_sp, fen_info);
-	if (IS_ERR(fib_node))
+	vr = mlxsw_sp_vr_find(mlxsw_sp, fen_info->tb_id);
+	if (!vr)
+		return NULL;
+	fib = mlxsw_sp_vr_fib(vr, MLXSW_SP_L3_PROTO_IPV4);
+
+	fib_node = mlxsw_sp_fib_node_lookup(fib, &fen_info->dst,
+					    sizeof(fen_info->dst),
+					    fen_info->dst_len);
+	if (!fib_node)
 		return NULL;
 
 	list_for_each_entry(fib_entry, &fib_node->entry_list, list) {