Merge branch 'mlxsw-Offload-FIFO'

Ido Schimmel says:

====================
mlxsw: Offload FIFO

Petr says:

If an ETS or PRIO band contains an offloaded qdisc, it is possible to
obtain offloaded counters for that band. However, some of the bands will
likely simply contain the default invisible FIFO qdisc, which does not
present the counters.

To remedy this situation, make FIFO offloadable, and offload it by mlxsw
when below PRIO and ETS for the sole purpose of providing counters for the
bands that do not include other qdiscs.

- In patch projectacrn#1, FIFO is extended to support offloading.
- Patches projectacrn#2 and projectacrn#3 restructure bits of mlxsw to facilitate
  the offload logic.
- Patch projectacrn#4 then implements the offload itself.
- Patch projectacrn#5 changes the ETS selftest to use the new counters.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -1783,6 +1783,8 @@ static int mlxsw_sp_setup_tc(struct net_device *dev, enum tc_setup_type type,
 		return mlxsw_sp_setup_tc_ets(mlxsw_sp_port, type_data);
 	case TC_SETUP_QDISC_TBF:
 		return mlxsw_sp_setup_tc_tbf(mlxsw_sp_port, type_data);
+	case TC_SETUP_QDISC_FIFO:
+		return mlxsw_sp_setup_tc_fifo(mlxsw_sp_port, type_data);
 	default:
 		return -EOPNOTSUPP;
 	}

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -139,6 +139,7 @@ struct mlxsw_sp_port_type_speed_ops;
 struct mlxsw_sp_ptp_state;
 struct mlxsw_sp_ptp_ops;
 struct mlxsw_sp_span_ops;
+struct mlxsw_sp_qdisc_state;
 
 struct mlxsw_sp_port_mapping {
 	u8 module;
@@ -276,8 +277,7 @@ struct mlxsw_sp_port {
 	struct mlxsw_sp_port_sample *sample;
 	struct list_head vlans_list;
 	struct mlxsw_sp_port_vlan *default_vlan;
-	struct mlxsw_sp_qdisc *root_qdisc;
-	struct mlxsw_sp_qdisc *tclass_qdiscs;
+	struct mlxsw_sp_qdisc_state *qdisc;
 	unsigned acl_rule_count;
 	struct mlxsw_sp_acl_block *ing_acl_block;
 	struct mlxsw_sp_acl_block *eg_acl_block;
@@ -867,6 +867,8 @@ int mlxsw_sp_setup_tc_ets(struct mlxsw_sp_port *mlxsw_sp_port,
 			  struct tc_ets_qopt_offload *p);
 int mlxsw_sp_setup_tc_tbf(struct mlxsw_sp_port *mlxsw_sp_port,
 			  struct tc_tbf_qopt_offload *p);
+int mlxsw_sp_setup_tc_fifo(struct mlxsw_sp_port *mlxsw_sp_port,
+			   struct tc_fifo_qopt_offload *p);
 
 /* spectrum_fid.c */
 bool mlxsw_sp_fid_is_dummy(struct mlxsw_sp *mlxsw_sp, u16 fid_index);