net/mlx5: Refactor scheduling element configuration bitmasks

Refactor esw_qos_sched_elem_config to set bitmasks only when max_rate
or bw_share values change, allowing the function to configure nodes
with only one of these parameters.

This enables more flexible usage for nodes where only one parameter
requires configuration.

Remove scattered assignments and checks to centralize them within this
function, removing the now redundant esw_qos_set_node_max_rate
entirely.

With this refactor, also remove the assignment of the vport scheduling
node max rate to the parent max rate for unlimited vports
(where max rate is set to zero), as firmware already handles this
behavior.

Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20241107194357.683732-5-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 24 insertions, 56 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c b/drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c
index 82805bb20c76..c1e7b2425ebe 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c
@@ -143,10 +143,21 @@ static int esw_qos_sched_elem_config(struct mlx5_esw_sched_node *node, u32 max_r
 	if (!MLX5_CAP_GEN(dev, qos) || !MLX5_CAP_QOS(dev, esw_scheduling))
 		return -EOPNOTSUPP;
 
-	MLX5_SET(scheduling_context, sched_ctx, max_average_bw, max_rate);
-	MLX5_SET(scheduling_context, sched_ctx, bw_share, bw_share);
-	bitmask |= MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_MAX_AVERAGE_BW;
-	bitmask |= MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_BW_SHARE;
+	if (bw_share && (!MLX5_CAP_QOS(dev, esw_bw_share) ||
+			 MLX5_CAP_QOS(dev, max_tsar_bw_share) < MLX5_MIN_BW_SHARE))
+		return -EOPNOTSUPP;
+
+	if (node->max_rate == max_rate && node->bw_share == bw_share)
+		return 0;
+
+	if (node->max_rate != max_rate) {
+		MLX5_SET(scheduling_context, sched_ctx, max_average_bw, max_rate);
+		bitmask |= MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_MAX_AVERAGE_BW;
+	}
+	if (node->bw_share != bw_share) {
+		MLX5_SET(scheduling_context, sched_ctx, bw_share, bw_share);
+		bitmask |= MODIFY_SCHEDULING_ELEMENT_IN_MODIFY_BITMASK_BW_SHARE;
+	}
 
 	err = mlx5_modify_scheduling_element_cmd(dev,
 						 SCHEDULING_HIERARCHY_E_SWITCH,
@@ -160,6 +171,8 @@ static int esw_qos_sched_elem_config(struct mlx5_esw_sched_node *node, u32 max_r
 		return err;
 	}
 
+	node->max_rate = max_rate;
+	node->bw_share = bw_share;
 	if (node->type == SCHED_NODE_TYPE_VPORTS_TSAR)
 		trace_mlx5_esw_node_qos_config(dev, node, node->ix, bw_share, max_rate);
 	else if (node->type == SCHED_NODE_TYPE_VPORT)
@@ -217,11 +230,7 @@ static void esw_qos_update_sched_node_bw_share(struct mlx5_esw_sched_node *node,
 
 	bw_share = esw_qos_calc_bw_share(node->min_rate, divider, fw_max_bw_share);
 
-	if (bw_share == node->bw_share)
-		return;
-
 	esw_qos_sched_elem_config(node, node->max_rate, bw_share, extack);
-	node->bw_share = bw_share;
 }
 
 static void esw_qos_normalize_min_rate(struct mlx5_eswitch *esw,
@@ -250,10 +259,6 @@ static int esw_qos_set_node_min_rate(struct mlx5_esw_sched_node *node,
 {
 	struct mlx5_eswitch *esw = node->esw;
 
-	if (min_rate && (!MLX5_CAP_QOS(esw->dev, esw_bw_share) ||
-			 MLX5_CAP_QOS(esw->dev, max_tsar_bw_share) < MLX5_MIN_BW_SHARE))
-		return -EOPNOTSUPP;
-
 	if (min_rate == node->min_rate)
 		return 0;
 
@@ -263,41 +268,6 @@ static int esw_qos_set_node_min_rate(struct mlx5_esw_sched_node *node,
 	return 0;
 }
 
-static int esw_qos_set_node_max_rate(struct mlx5_esw_sched_node *node,
-				     u32 max_rate, struct netlink_ext_ack *extack)
-{
-	struct mlx5_esw_sched_node *vport_node;
-	int err;
-
-	if (node->max_rate == max_rate)
-		return 0;
-
-	/* Use parent node limit if new max rate is 0. */
-	if (!max_rate && node->parent)
-		max_rate = node->parent->max_rate;
-
-	err = esw_qos_sched_elem_config(node, max_rate, node->bw_share, extack);
-	if (err)
-		return err;
-
-	node->max_rate = max_rate;
-	if (node->type != SCHED_NODE_TYPE_VPORTS_TSAR)
-		return 0;
-
-	/* Any unlimited vports in the node should be set with the value of the node. */
-	list_for_each_entry(vport_node, &node->children, entry) {
-		if (vport_node->max_rate)
-			continue;
-
-		err = esw_qos_sched_elem_config(vport_node, max_rate, vport_node->bw_share, extack);
-		if (err)
-			NL_SET_ERR_MSG_MOD(extack,
-					   "E-Switch vport implicit rate limit setting failed");
-	}
-
-	return err;
-}
-
 static int esw_qos_create_node_sched_elem(struct mlx5_core_dev *dev, u32 parent_element_id,
 					  u32 *tsar_ix)
 {
@@ -367,7 +337,6 @@ static int esw_qos_update_node_scheduling_element(struct mlx5_vport *vport,
 						  struct netlink_ext_ack *extack)
 {
 	struct mlx5_esw_sched_node *vport_node = vport->qos.sched_node;
-	u32 max_rate;
 	int err;
 
 	err = mlx5_destroy_scheduling_element_cmd(curr_node->esw->dev,
@@ -378,9 +347,7 @@ static int esw_qos_update_node_scheduling_element(struct mlx5_vport *vport,
 		return err;
 	}
 
-	/* Use new node max rate if vport max rate is unlimited. */
-	max_rate = vport_node->max_rate ? vport_node->max_rate : new_node->max_rate;
-	err = esw_qos_vport_create_sched_element(vport, new_node, max_rate,
+	err = esw_qos_vport_create_sched_element(vport, new_node, vport_node->max_rate,
 						 vport_node->bw_share,
 						 &vport_node->ix);
 	if (err) {
@@ -393,8 +360,7 @@ static int esw_qos_update_node_scheduling_element(struct mlx5_vport *vport,
 	return 0;
 
 err_sched:
-	max_rate = vport_node->max_rate ? vport_node->max_rate : curr_node->max_rate;
-	if (esw_qos_vport_create_sched_element(vport, curr_node, max_rate,
+	if (esw_qos_vport_create_sched_element(vport, curr_node, vport_node->max_rate,
 					       vport_node->bw_share,
 					       &vport_node->ix))
 		esw_warn(curr_node->esw->dev, "E-Switch vport node restore failed (vport=%d)\n",
@@ -707,7 +673,8 @@ int mlx5_esw_qos_set_vport_rate(struct mlx5_vport *vport, u32 max_rate, u32 min_
 
 	err = esw_qos_set_node_min_rate(vport->qos.sched_node, min_rate, NULL);
 	if (!err)
-		err = esw_qos_set_node_max_rate(vport->qos.sched_node, max_rate, NULL);
+		err = esw_qos_sched_elem_config(vport->qos.sched_node, max_rate,
+						vport->qos.sched_node->bw_share, NULL);
 unlock:
 	esw_qos_unlock(esw);
 	return err;
@@ -930,7 +897,8 @@ int mlx5_esw_devlink_rate_leaf_tx_max_set(struct devlink_rate *rate_leaf, void *
 	if (err)
 		goto unlock;
 
-	err = esw_qos_set_node_max_rate(vport->qos.sched_node, tx_max, extack);
+	err = esw_qos_sched_elem_config(vport->qos.sched_node, tx_max,
+					vport->qos.sched_node->bw_share, extack);
 unlock:
 	esw_qos_unlock(esw);
 	return err;
@@ -965,7 +933,7 @@ int mlx5_esw_devlink_rate_node_tx_max_set(struct devlink_rate *rate_node, void *
 		return err;
 
 	esw_qos_lock(esw);
-	err = esw_qos_set_node_max_rate(node, tx_max, extack);
+	err = esw_qos_sched_elem_config(node, tx_max, node->bw_share, extack);
 	esw_qos_unlock(esw);
 	return err;
 }