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net/mlx5e: Disable Striding RQ when PCI is slower than link 

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>
This commit is contained in:
Tariq Toukan 2018-02-11 11:58:30 +02:00 committed by Saeed Mahameed
parent 0608d4dbaf
commit 291f445eab
1 changed files with 6 additions and 3 deletions
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9
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@ -113,13 +113,16 @@ void mlx5e_init_rq_type_params(struct mlx5_core_dev *mdev,
MLX5E_GET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS)); 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, static void mlx5e_set_rq_params(struct mlx5_core_dev *mdev,
struct mlx5e_params *params) struct mlx5e_params *params)
{ {
u8 rq_type = mlx5e_check_fragmented_striding_rq_cap(mdev) && u8 rq_type = mlx5e_check_fragmented_striding_rq_cap(mdev) &&
!params->xdp_prog && !MLX5_IPSEC_DEV(mdev) ? !slow_pci_heuristic(mdev) &&
MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ : !params->xdp_prog && !MLX5_IPSEC_DEV(mdev) ?
MLX5_WQ_TYPE_LINKED_LIST; MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ :
MLX5_WQ_TYPE_LINKED_LIST;
mlx5e_init_rq_type_params(mdev, params, rq_type); mlx5e_init_rq_type_params(mdev, params, rq_type);
} }