net/mlx5e: Add hairpin params structure

In preparation for downstream work to expose hairpin queues parameters,
introduce a hairpin parameters struct as part of the tc structure.
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -71,6 +71,12 @@
 #define MLX5E_TC_TABLE_NUM_GROUPS 4
 #define MLX5E_TC_TABLE_MAX_GROUP_SIZE BIT(18)
 
+struct mlx5e_hairpin_params {
+	struct mlx5_core_dev *mdev;
+	u32 num_queues;
+	u32 queue_size;
+};
+
 struct mlx5e_tc_table {
 	/* Protects the dynamic assignment of the t parameter
 	 * which is the nic tc root table.
@@ -93,6 +99,7 @@ struct mlx5e_tc_table {
 
 	struct mlx5_tc_ct_priv         *ct;
 	struct mapping_ctx             *mapping;
+	struct mlx5e_hairpin_params    hairpin_params;
 };
 
 struct mlx5e_tc_attr_to_reg_mapping mlx5e_tc_attr_to_reg_mappings[] = {
@@ -1016,6 +1023,26 @@ static int mlx5e_hairpin_get_prio(struct mlx5e_priv *priv,
 	return 0;
 }
 
+static void
+mlx5e_hairpin_params_init(struct mlx5e_hairpin_params *hairpin_params,
+			  struct mlx5_core_dev *mdev)
+{
+	u64 link_speed64;
+	u32 link_speed;
+
+	hairpin_params->mdev = mdev;
+	/* set hairpin pair per each 50Gbs share of the link */
+	mlx5e_port_max_linkspeed(mdev, &link_speed);
+	link_speed = max_t(u32, link_speed, 50000);
+	link_speed64 = link_speed;
+	do_div(link_speed64, 50000);
+	hairpin_params->num_queues = link_speed64;
+
+	hairpin_params->queue_size =
+		BIT(min_t(u32, 16 - MLX5_MPWRQ_MIN_LOG_STRIDE_SZ(mdev),
+			  MLX5_CAP_GEN(mdev, log_max_hairpin_num_packets)));
+}
+
 static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 				  struct mlx5e_tc_flow *flow,
 				  struct mlx5e_tc_flow_parse_attr *parse_attr,
@@ -1027,8 +1054,6 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 	struct mlx5_core_dev *peer_mdev;
 	struct mlx5e_hairpin_entry *hpe;
 	struct mlx5e_hairpin *hp;
-	u64 link_speed64;
-	u32 link_speed;
 	u8 match_prio;
 	u16 peer_id;
 	int err;
@@ -1081,21 +1106,16 @@ static int mlx5e_hairpin_flow_add(struct mlx5e_priv *priv,
 		 hash_hairpin_info(peer_id, match_prio));
 	mutex_unlock(&tc->hairpin_tbl_lock);
 
-	params.log_data_size = clamp_t(u8, 16,
-				       MLX5_CAP_GEN(priv->mdev, log_min_hairpin_wq_data_sz),
-				       MLX5_CAP_GEN(priv->mdev, log_max_hairpin_wq_data_sz));
-	params.log_num_packets = params.log_data_size -
-				 MLX5_MPWRQ_MIN_LOG_STRIDE_SZ(priv->mdev);
-	params.log_num_packets = min_t(u8, params.log_num_packets,
-				       MLX5_CAP_GEN(priv->mdev, log_max_hairpin_num_packets));
+	params.log_num_packets = ilog2(tc->hairpin_params.queue_size);
+	params.log_data_size =
+		clamp_t(u32,
+			params.log_num_packets +
+				MLX5_MPWRQ_MIN_LOG_STRIDE_SZ(priv->mdev),
+			MLX5_CAP_GEN(priv->mdev, log_min_hairpin_wq_data_sz),
+			MLX5_CAP_GEN(priv->mdev, log_max_hairpin_wq_data_sz));
 
 	params.q_counter = priv->q_counter;
-	/* set hairpin pair per each 50Gbs share of the link */
-	mlx5e_port_max_linkspeed(priv->mdev, &link_speed);
-	link_speed = max_t(u32, link_speed, 50000);
-	link_speed64 = link_speed;
-	do_div(link_speed64, 50000);
-	params.num_channels = link_speed64;
+	params.num_channels = tc->hairpin_params.num_queues;
 
 	hp = mlx5e_hairpin_create(priv, &params, peer_ifindex);
 	hpe->hp = hp;
@@ -5217,6 +5237,8 @@ int mlx5e_tc_nic_init(struct mlx5e_priv *priv)
 	tc->ct = mlx5_tc_ct_init(priv, tc->chains, &tc->mod_hdr,
 				 MLX5_FLOW_NAMESPACE_KERNEL, tc->post_act);
 
+	mlx5e_hairpin_params_init(&tc->hairpin_params, dev);
+
 	tc->netdevice_nb.notifier_call = mlx5e_tc_netdev_event;
 	err = register_netdevice_notifier_dev_net(priv->netdev,
 						  &tc->netdevice_nb,