netdev - [PATCH net-next V3 5/8] net/mlx5: Add support for new scheduling elements

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Message-ID: <20241117205046.736499-6-tariqt@nvidia.com>
Date: Sun, 17 Nov 2024 22:50:42 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "Andrew
 Lunn" <andrew+netdev@...n.ch>
CC: <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>, Gal Pressman
	<gal@...dia.com>, Leon Romanovsky <leonro@...dia.com>, Jiri Pirko
	<jiri@...nulli.us>, Carolina Jubran <cjubran@...dia.com>, Cosmin Ratiu
	<cratiu@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net-next V3 5/8] net/mlx5: Add support for new scheduling elements

From: Carolina Jubran <cjubran@...dia.com>

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 <cjubran@...dia.com>
Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/rl.c |  4 ++++
 include/linux/mlx5/mlx5_ifc.h                | 14 +++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/rl.c b/drivers/net/ethernet/mellanox/mlx5/core/rl.c
index e393391966e0..39a209b9b684 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/rl.c
+++ b/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;
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index cf354d34b30a..87ec079ec83f 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/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];
@@ -4096,6 +4097,7 @@ 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 {
@@ -4104,22 +4106,26 @@ 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];
 };
@@ -4156,7 +4162,9 @@ 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 {
-- 
2.44.0