From: Tariq Toukan <tariqt@mellanox.com>
Date: Sun, 11 Feb 2018 11:58:30 +0200
Subject: net/mlx5e: Disable Striding RQ when PCI is slower than link
Patch-mainline: v4.17-rc1
Git-commit: 291f445eab9b2b11c8dd05ae1a0943c328cb9b6b
References: bsc#1103990 FATE#326006
We turn the feature off for servers with PCI BW bounded
by a threshold (16G) and lower than MAX LINK BW.
This improves the effectiveness of CQE compression feature,
that is defaulted to ON for the same case.
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -113,13 +113,16 @@ void mlx5e_init_rq_type_params(struct ml
MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS));
}
+static bool slow_pci_heuristic(struct mlx5_core_dev *mdev);
+
static void mlx5e_set_rq_params(struct mlx5_core_dev *mdev,
struct mlx5e_params *params)
{
u8 rq_type = mlx5e_check_fragmented_striding_rq_cap(mdev) &&
- !params->xdp_prog && !MLX5_IPSEC_DEV(mdev) ?
- MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ :
- MLX5_WQ_TYPE_LINKED_LIST;
+ !slow_pci_heuristic(mdev) &&
+ !params->xdp_prog && !MLX5_IPSEC_DEV(mdev) ?
+ MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ :
+ MLX5_WQ_TYPE_LINKED_LIST;
mlx5e_init_rq_type_params(mdev, params, rq_type);
}