net/mlx5: Add support for new scheduling elements

Introduce new scheduling elements in the E-Switch QoS hierarchy to
enhance traffic management capabilities. This patch adds support for:

- Rate Limit scheduling elements: Enables bandwidth limitation across
  multiple nodes without a shared ancestor, providing a mechanism for
  more granular control of bandwidth allocation.

- Traffic Class Transmit Scheduling Arbiter (TSAR): Introduces the
  infrastructure for creating Traffic Class TSARs, allowing
  hierarchical arbitration based on traffic classes.

- Traffic Class Arbiter TSAR: Adds support for a TSAR capable of
  managing arbitration between multiple traffic classes, enabling
  improved bandwidth prioritization and traffic management.

No functional changes are introduced in this patch.

Signed-off-by: Carolina Jubran <[email protected]>
Reviewed-by: Cosmin Ratiu <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Leon Romanovsky <[email protected]>

Author: cjubran

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

@@ -56,6 +56,8 @@ bool mlx5_qos_tsar_type_supported(struct mlx5_core_dev *dev, int type, u8 hierar
 		return cap & TSAR_TYPE_CAP_MASK_ROUND_ROBIN;
 	case TSAR_ELEMENT_TSAR_TYPE_ETS:
 		return cap & TSAR_TYPE_CAP_MASK_ETS;
+	case TSAR_ELEMENT_TSAR_TYPE_TC_ARB:
+		return cap & TSAR_TYPE_CAP_MASK_TC_ARB;
 	}
 
 	return false;
@@ -87,6 +89,8 @@ bool mlx5_qos_element_type_supported(struct mlx5_core_dev *dev, int type, u8 hie
 		return cap & ELEMENT_TYPE_CAP_MASK_PARA_VPORT_TC;
 	case SCHEDULING_CONTEXT_ELEMENT_TYPE_QUEUE_GROUP:
 		return cap & ELEMENT_TYPE_CAP_MASK_QUEUE_GROUP;
+	case SCHEDULING_CONTEXT_ELEMENT_TYPE_RATE_LIMIT:
+		return cap & ELEMENT_TYPE_CAP_MASK_RATE_LIMIT;
 	}
 
 	return false;

include/linux/mlx5/mlx5_ifc.h

@@ -1103,7 +1103,8 @@ struct mlx5_ifc_qos_cap_bits {
 
 	u8         packet_pacing_min_rate[0x20];
 
-	u8         reserved_at_80[0x10];
+	u8         reserved_at_80[0xb];
+	u8         log_esw_max_rate_limit[0x5];
 	u8         packet_pacing_rate_table_size[0x10];
 
 	u8         esw_element_type[0x10];
@@ -4104,6 +4105,7 @@ enum {
 	SCHEDULING_CONTEXT_ELEMENT_TYPE_VPORT_TC = 0x2,
 	SCHEDULING_CONTEXT_ELEMENT_TYPE_PARA_VPORT_TC = 0x3,
 	SCHEDULING_CONTEXT_ELEMENT_TYPE_QUEUE_GROUP = 0x4,
+	SCHEDULING_CONTEXT_ELEMENT_TYPE_RATE_LIMIT = 0x5,
 };
 
 enum {
@@ -4112,22 +4114,26 @@ enum {
 	ELEMENT_TYPE_CAP_MASK_VPORT_TC		= 1 << 2,
 	ELEMENT_TYPE_CAP_MASK_PARA_VPORT_TC	= 1 << 3,
 	ELEMENT_TYPE_CAP_MASK_QUEUE_GROUP	= 1 << 4,
+	ELEMENT_TYPE_CAP_MASK_RATE_LIMIT	= 1 << 5,
 };
 
 enum {
 	TSAR_ELEMENT_TSAR_TYPE_DWRR = 0x0,
 	TSAR_ELEMENT_TSAR_TYPE_ROUND_ROBIN = 0x1,
 	TSAR_ELEMENT_TSAR_TYPE_ETS = 0x2,
+	TSAR_ELEMENT_TSAR_TYPE_TC_ARB = 0x3,
 };
 
 enum {
 	TSAR_TYPE_CAP_MASK_DWRR		= 1 << 0,
 	TSAR_TYPE_CAP_MASK_ROUND_ROBIN	= 1 << 1,
 	TSAR_TYPE_CAP_MASK_ETS		= 1 << 2,
+	TSAR_TYPE_CAP_MASK_TC_ARB       = 1 << 3,
 };
 
 struct mlx5_ifc_tsar_element_bits {
-	u8         reserved_at_0[0x8];
+	u8         traffic_class[0x4];
+	u8         reserved_at_4[0x4];
 	u8         tsar_type[0x8];
 	u8         reserved_at_10[0x10];
 };
@@ -4164,7 +4170,9 @@ struct mlx5_ifc_scheduling_context_bits {
 
 	u8         max_average_bw[0x20];
 
-	u8         reserved_at_e0[0x120];
+	u8         max_bw_obj_id[0x20];
+
+	u8         reserved_at_100[0x100];
 };
 
 struct mlx5_ifc_rqtc_bits {