diff options
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en/params.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c index 0f18031a871a..68bc66cbd8a5 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c @@ -951,7 +951,7 @@ static u8 mlx5e_build_icosq_log_wq_sz(struct mlx5_core_dev *mdev, struct mlx5e_params *params, struct mlx5e_rq_param *rqp) { - u32 wqebbs; + u32 wqebbs, total_pages, useful_space; /* MLX5_WQ_TYPE_CYCLIC */ if (params->rq_wq_type != MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ) @@ -998,6 +998,18 @@ static u8 mlx5e_build_icosq_log_wq_sz(struct mlx5_core_dev *mdev, if (params->packet_merge.type == MLX5E_PACKET_MERGE_SHAMPO) wqebbs += mlx5e_shampo_icosq_sz(mdev, params, rqp); + /* UMR WQEs don't cross the page boundary, they are padded with NOPs. + * This padding is always smaller than the max WQE size. That gives us + * at least (PAGE_SIZE - (max WQE size - MLX5_SEND_WQE_BB)) useful bytes + * per page. The number of pages is estimated as the total size of WQEs + * divided by the useful space in page, rounding up. If some WQEs don't + * fully fit into the useful space, they can occupy part of the padding, + * which proves this estimation to be correct (reserve enough space). + */ + useful_space = PAGE_SIZE - mlx5e_get_max_sq_wqebbs(mdev) + MLX5_SEND_WQE_BB; + total_pages = DIV_ROUND_UP(wqebbs * MLX5_SEND_WQE_BB, useful_space); + wqebbs = total_pages * (PAGE_SIZE / MLX5_SEND_WQE_BB); + return max_t(u8, MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE, order_base_2(wqebbs)); } |