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From: Saeed Mahameed <saeedm@mellanox.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org, Tariq Toukan <tariqt@mellanox.com>,
	Saeed Mahameed <saeedm@mellanox.com>
Subject: [net-next 16/17] net/mlx5e: RX, Always prefer Linear SKB configuration
Date: Fri,  1 Jun 2018 17:05:43 -0700	[thread overview]
Message-ID: <20180602000544.18717-17-saeedm@mellanox.com> (raw)
In-Reply-To: <20180602000544.18717-1-saeedm@mellanox.com>

From: Tariq Toukan <tariqt@mellanox.com>

Prefer the linear SKB configuration of Legacy RQ over the
non-linear one of Striding RQ.

This implies that ConnectX-4 LX now uses legacy RQ by default,
as it does not support the linear configuration of Striding RQ.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 2c634e50d051..333d4ed52b94 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4405,9 +4405,16 @@ 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));
+	/* 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);
 
-- 
2.17.0

  parent reply	other threads:[~2018-06-02  0:26 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-02  0:05 [pull request][net-next 00/17] Mellanox, mlx5e updates 2018-06-01 Saeed Mahameed
2018-06-02  0:05 ` [net-next 01/17] net/mlx5e: IPOIB, Fix overflowing SQ WQE memset Saeed Mahameed
2018-06-02  0:05 ` [net-next 02/17] net/mlx5e: IPOIB, Add a missing skb_pull Saeed Mahameed
2018-06-02  0:05 ` [net-next 03/17] net/mlx5e: Present SW stats when state is not opened Saeed Mahameed
2018-06-02  0:05 ` [net-next 04/17] net/mlx5e: Remove redundant active_channels indication Saeed Mahameed
2018-06-02  0:05 ` [net-next 05/17] net/mlx5e: Increase aRFS flow tables size Saeed Mahameed
2018-06-02  0:05 ` [net-next 06/17] net/mlx5e: Support configurable MTU for vport representors Saeed Mahameed
2018-06-02  0:05 ` [net-next 07/17] net/mlx5: FPGA, Handle QP error event Saeed Mahameed
2018-06-02  0:05 ` [net-next 08/17] net/mlx5e: TX, Obsolete maintaining local copies of skb->len/data Saeed Mahameed
2018-06-02  0:05 ` [net-next 09/17] net/mlx5e: RX, Generalise name of non-linear SKB head size Saeed Mahameed
2018-06-02  0:05 ` [net-next 10/17] net/mlx5e: RX, Generalise function of SKB frag addition Saeed Mahameed
2018-06-02  0:05 ` [net-next 11/17] net/mlx5e: RX, Dedicate a function for copying SKB header Saeed Mahameed
2018-06-02  0:05 ` [net-next 12/17] net/mlx5e: RX, Remove HW LRO support in legacy RQ Saeed Mahameed
2018-06-02  0:05 ` [net-next 13/17] net/mlx5e: RX, Split WQ objects for different RQ types Saeed Mahameed
2018-06-02  0:05 ` [net-next 14/17] net/mlx5e: RX, Use cyclic WQ in legacy RQ Saeed Mahameed
2018-06-02  0:05 ` [net-next 15/17] net/mlx5e: RX, Enhance legacy Receive Queue memory scheme Saeed Mahameed
2018-06-02  0:05 ` Saeed Mahameed [this message]
2018-06-02  0:05 ` [net-next 17/17] net/mlx5e: TX, Separate cachelines of xmit and completion stats Saeed Mahameed
2018-06-02 12:55 ` [pull request][net-next 00/17] Mellanox, mlx5e updates 2018-06-01 David Miller

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