net/mlx5e: Add ethtool priv-flag for Striding RQ

Add a control private flag in ethtool to enable/disable
Striding RQ feature.
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -205,12 +205,14 @@ static const char mlx5e_priv_flags[][ETH_GSTRING_LEN] = {
 	"rx_cqe_moder",
 	"tx_cqe_moder",
 	"rx_cqe_compress",
+	"rx_striding_rq",
 };
 
 enum mlx5e_priv_flag {
 	MLX5E_PFLAG_RX_CQE_BASED_MODER = (1 << 0),
 	MLX5E_PFLAG_TX_CQE_BASED_MODER = (1 << 1),
 	MLX5E_PFLAG_RX_CQE_COMPRESS = (1 << 2),
+	MLX5E_PFLAG_RX_STRIDING_RQ = (1 << 3),
 };
 
 #define MLX5E_SET_PFLAG(params, pflag, enable)			\
@@ -827,6 +829,10 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
 void mlx5e_free_txqsq_descs(struct mlx5e_txqsq *sq);
 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);
 
+bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev);
+bool mlx5e_striding_rq_possible(struct mlx5_core_dev *mdev,
+				struct mlx5e_params *params);
+
 void mlx5e_page_release(struct mlx5e_rq *rq, struct mlx5e_dma_info *dma_info,
 			bool recycle);
 void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);
@@ -917,6 +923,7 @@ void mlx5e_set_tx_cq_mode_params(struct mlx5e_params *params,
 				 u8 cq_period_mode);
 void mlx5e_set_rx_cq_mode_params(struct mlx5e_params *params,
 				 u8 cq_period_mode);
+void mlx5e_set_rq_type(struct mlx5_core_dev *mdev, struct mlx5e_params *params);
 void mlx5e_init_rq_type_params(struct mlx5_core_dev *mdev,
 			       struct mlx5e_params *params);
 

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

@@ -1598,6 +1598,38 @@ static int set_pflag_rx_cqe_compress(struct net_device *netdev,
 	return 0;
 }
 
+static int set_pflag_rx_striding_rq(struct net_device *netdev, bool enable)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct mlx5_core_dev *mdev = priv->mdev;
+	struct mlx5e_channels new_channels = {};
+	int err;
+
+	if (enable) {
+		if (!mlx5e_check_fragmented_striding_rq_cap(mdev))
+			return -EOPNOTSUPP;
+		if (!mlx5e_striding_rq_possible(mdev, &priv->channels.params))
+			return -EINVAL;
+	}
+
+	new_channels.params = priv->channels.params;
+
+	MLX5E_SET_PFLAG(&new_channels.params, MLX5E_PFLAG_RX_STRIDING_RQ, enable);
+	mlx5e_set_rq_type(mdev, &new_channels.params);
+
+	if (!test_bit(MLX5E_STATE_OPENED, &priv->state)) {
+		priv->channels.params = new_channels.params;
+		return 0;
+	}
+
+	err = mlx5e_open_channels(priv, &new_channels);
+	if (err)
+		return err;
+
+	mlx5e_switch_priv_channels(priv, &new_channels, NULL);
+	return 0;
+}
+
 static int mlx5e_handle_pflag(struct net_device *netdev,
 			      u32 wanted_flags,
 			      enum mlx5e_priv_flag flag,
@@ -1643,6 +1675,12 @@ static int mlx5e_set_priv_flags(struct net_device *netdev, u32 pflags)
 	err = mlx5e_handle_pflag(netdev, pflags,
 				 MLX5E_PFLAG_RX_CQE_COMPRESS,
 				 set_pflag_rx_cqe_compress);
+	if (err)
+		goto out;
+
+	err = mlx5e_handle_pflag(netdev, pflags,
+				 MLX5E_PFLAG_RX_STRIDING_RQ,
+				 set_pflag_rx_striding_rq);
 
 out:
 	mutex_unlock(&priv->state_lock);

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

@@ -71,7 +71,7 @@ struct mlx5e_channel_param {
 	struct mlx5e_cq_param      icosq_cq;
 };
 
-static bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev)
+bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev)
 {
 	return MLX5_CAP_GEN(mdev, striding_rq) &&
 		MLX5_CAP_GEN(mdev, umr_ptr_rlky) &&
@@ -132,14 +132,17 @@ void mlx5e_init_rq_type_params(struct mlx5_core_dev *mdev,
 		       MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS));
 }
 
-static bool slow_pci_heuristic(struct mlx5_core_dev *mdev);
-
-static void mlx5e_set_rq_type(struct mlx5_core_dev *mdev,
+bool mlx5e_striding_rq_possible(struct mlx5_core_dev *mdev,
 				struct mlx5e_params *params)
 {
-	params->rq_wq_type = mlx5e_check_fragmented_striding_rq_cap(mdev) &&
-		!slow_pci_heuristic(mdev) &&
-		!params->xdp_prog && !MLX5_IPSEC_DEV(mdev) ?
+	return mlx5e_check_fragmented_striding_rq_cap(mdev) &&
+		!params->xdp_prog && !MLX5_IPSEC_DEV(mdev);
+}
+
+void mlx5e_set_rq_type(struct mlx5_core_dev *mdev, struct mlx5e_params *params)
+{
+	params->rq_wq_type = mlx5e_striding_rq_possible(mdev, params) &&
+		MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ) ?
 		MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ :
 		MLX5_WQ_TYPE_LINKED_LIST;
 }
@@ -4027,6 +4030,9 @@ 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 */
+	if (mlx5e_striding_rq_possible(mdev, params))
+		MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ,
+				!slow_pci_heuristic(mdev));
 	mlx5e_set_rq_type(mdev, params);
 	mlx5e_init_rq_type_params(mdev, params);
 

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

@@ -56,7 +56,8 @@ static void mlx5i_build_nic_params(struct mlx5_core_dev *mdev,
 				   struct mlx5e_params *params)
 {
 	/* Override RQ params as IPoIB supports only LINKED LIST RQ for now */
-	params->rq_wq_type = MLX5_WQ_TYPE_LINKED_LIST;
+	MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_STRIDING_RQ, false);
+	mlx5e_set_rq_type(mdev, params);
 	mlx5e_init_rq_type_params(mdev, params);
 
 	/* RQ size in ipoib by default is 512 */