net/mlx5: ft: Use getter function to get ft chain

FT chain is defined as the next chain after tc.

To prepare for next patches that will increase the number of tc
chains available at runtime, use a getter function to get this
value.

The define is still used in static fs_core allocation,
to calculate the number of chains. This static allocation
will be used if the relevant capabilities won't be available
to support dynamic chains.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -1268,7 +1268,7 @@ static int mlx5e_rep_setup_ft_cb(enum tc_setup_type type, void *type_data,
 		 * reserved ft chain.
 		 */
 		memcpy(&cls_flower, f, sizeof(*f));
-		cls_flower.common.chain_index = FDB_FT_CHAIN;
+		cls_flower.common.chain_index = mlx5_eswitch_get_ft_chain(esw);
 		err = mlx5e_rep_setup_tc_cls_flower(priv, &cls_flower, flags);
 		memcpy(&f->stats, &cls_flower.stats, sizeof(f->stats));
 		return err;

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -364,6 +364,9 @@ mlx5_eswitch_get_prio_range(struct mlx5_eswitch *esw);
 u32
 mlx5_eswitch_get_chain_range(struct mlx5_eswitch *esw);
 
+unsigned int
+mlx5_eswitch_get_ft_chain(struct mlx5_eswitch *esw);
+
 struct mlx5_flow_handle *
 mlx5_eswitch_create_vport_rx_rule(struct mlx5_eswitch *esw, u16 vport,
 				  struct mlx5_flow_destination *dest);

drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c

@@ -80,6 +80,11 @@ u32 mlx5_eswitch_get_chain_range(struct mlx5_eswitch *esw)
 	return 0;
 }
 
+u32 mlx5_eswitch_get_ft_chain(struct mlx5_eswitch *esw)
+{
+	return mlx5_eswitch_get_chain_range(esw) + 1;
+}
+
 u16 mlx5_eswitch_get_prio_range(struct mlx5_eswitch *esw)
 {
 	if (esw->fdb_table.flags & ESW_FDB_CHAINS_AND_PRIOS_SUPPORTED)