net/mlx5e: Change VF representors' RQ type

The representors' RQ size was not large enough for them to achieve
high enough performance, and therefore needed to be enlarged, while
suffering a minimum hit to its memory usage. To achieve this the
representors RQ size was increased, and its type was changed to be a
striding RQ if it is supported.

Towards that goal the following changes were made:

* Extracted the sequence for setting the standard netdev's RQ parmas
  into a function

* Replaced the sequence for setting the representor's RQ params with
  the standard sequence

The impact of this change can be seen in the following measurements
taken on a setup of a VM over a VF, connected to OVS via the VF
representor, to an external host:

Before current change:
                     TCP Throughput [Gb/s]
VM to external host         ~  7.2

With the current change (measured with a striding RQ):
                     TCP Throughput [Gb/s]
VM to external host         ~ 23.5

Each representor now consumes 2 [MB] of memory for its packet
buffers.
Signed-off-by: Gavi Teitz <gavi@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -966,6 +966,8 @@ void mlx5e_destroy_netdev(struct mlx5e_priv *priv);
 void mlx5e_build_nic_params(struct mlx5_core_dev *mdev,
 			    struct mlx5e_params *params,
 			    u16 max_channels, u16 mtu);
+void mlx5e_build_rq_params(struct mlx5_core_dev *mdev,
+			   struct mlx5e_params *params);
 u8 mlx5e_params_calculate_tx_min_inline(struct mlx5_core_dev *mdev);
 void mlx5e_rx_dim_work(struct work_struct *work);
 void mlx5e_tx_dim_work(struct work_struct *work);

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

@@ -4480,6 +4480,23 @@ static u32 mlx5e_choose_lro_timeout(struct mlx5_core_dev *mdev, u32 wanted_timeo
 	return MLX5_CAP_ETH(mdev, lro_timer_supported_periods[i]);
 }
 
+void mlx5e_build_rq_params(struct mlx5_core_dev *mdev,
+			   struct mlx5e_params *params)
+{
+	/* Prefer Striding RQ, unless any of the following holds:
+	 * - Striding RQ configuration is not possible/supported.
+	 * - Slow PCI heuristic.
+	 * - Legacy RQ would use linear SKB while Striding RQ would use non-linear.
+	 */
+	if (!slow_pci_heuristic(mdev) &&
+	    mlx5e_striding_rq_possible(mdev, params) &&
+	    (mlx5e_rx_mpwqe_is_linear_skb(mdev, params) ||
+	     !mlx5e_rx_is_linear_skb(mdev, params)))
+		MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ, true);
+	mlx5e_set_rq_type(mdev, params);
+	mlx5e_init_rq_type_params(mdev, params);
+}
+
 void mlx5e_build_nic_params(struct mlx5_core_dev *mdev,
 			    struct mlx5e_params *params,
 			    u16 max_channels, u16 mtu)
@@ -4505,18 +4522,7 @@ void mlx5e_build_nic_params(struct mlx5_core_dev *mdev,
 	MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS, params->rx_cqe_compress_def);
 
 	/* RQ */
-	/* Prefer Striding RQ, unless any of the following holds:
-	 * - Striding RQ configuration is not possible/supported.
-	 * - Slow PCI heuristic.
-	 * - Legacy RQ would use linear SKB while Striding RQ would use non-linear.
-	 */
-	if (!slow_pci_heuristic(mdev) &&
-	    mlx5e_striding_rq_possible(mdev, params) &&
-	    (mlx5e_rx_mpwqe_is_linear_skb(mdev, params) ||
-	     !mlx5e_rx_is_linear_skb(mdev, params)))
-		MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ, true);
-	mlx5e_set_rq_type(mdev, params);
-	mlx5e_init_rq_type_params(mdev, params);
+	mlx5e_build_rq_params(mdev, params);
 
 	/* HW LRO */
 

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

@@ -46,8 +46,6 @@
 
 #define MLX5E_REP_PARAMS_LOG_SQ_SIZE \
 	max(0x6, MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE)
-#define MLX5E_REP_PARAMS_LOG_RQ_SIZE \
-	max(0x6, MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE)
 
 static const char mlx5e_rep_driver_name[] = "mlx5e_rep";
 
@@ -934,14 +932,15 @@ static void mlx5e_build_rep_params(struct mlx5_core_dev *mdev,
 	params->hard_mtu    = MLX5E_ETH_HARD_MTU;
 	params->sw_mtu      = mtu;
 	params->log_sq_size = MLX5E_REP_PARAMS_LOG_SQ_SIZE;
-	params->rq_wq_type  = MLX5_WQ_TYPE_CYCLIC;
-	params->log_rq_mtu_frames = MLX5E_REP_PARAMS_LOG_RQ_SIZE;
 
+	/* RQ */
+	mlx5e_build_rq_params(mdev, params);
+
+	/* CQ moderation params */
 	params->rx_dim_enabled = MLX5_CAP_GEN(mdev, cq_moderation);
 	mlx5e_set_rx_cq_mode_params(params, cq_period_mode);
 
 	params->num_tc                = 1;
-	params->lro_wqe_sz            = MLX5E_PARAMS_DEFAULT_LRO_WQE_SZ;
 
 	mlx5_query_min_inline(mdev, &params->tx_min_inline_mode);
 }
@@ -1077,7 +1076,7 @@ static const struct mlx5e_profile mlx5e_rep_profile = {
 	.max_nch		= mlx5e_get_rep_max_num_channels,
 	.update_carrier		= NULL,
 	.rx_handlers.handle_rx_cqe       = mlx5e_handle_rx_cqe_rep,
-	.rx_handlers.handle_rx_cqe_mpwqe = NULL /* Not supported */,
+	.rx_handlers.handle_rx_cqe_mpwqe = mlx5e_handle_rx_cqe_mpwrq,
 	.max_tc			= 1,
 };