[PATCH net-next 14/15] net/mlx5e: Add param helper to calculate max page size
From: Tariq Toukan <tariqt@nvidia.com>
Date: 2026-02-23 20:44:31
Also in:
bpf, linux-rdma, lkml
Subsystem:
mellanox mlx5 core vpi driver, networking drivers, the rest · Maintainers:
Saeed Mahameed, Leon Romanovsky, Tariq Toukan, Mark Bloch, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Dragos Tatulea <dtatulea@nvidia.com> This function will be necessary to determine the upper limit of rx-page-size. Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> --- drivers/net/ethernet/mellanox/mlx5/core/en/params.c | 12 ++++++++++++ drivers/net/ethernet/mellanox/mlx5/core/en/params.h | 1 + 2 files changed, 13 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
index 304b46ecc8df..26bb31c56e45 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c@@ -501,6 +501,18 @@ u16 mlx5e_get_rq_headroom(struct mlx5_core_dev *mdev, return 0; } +u32 mlx5e_mpwrq_max_page_size(struct mlx5_core_dev *mdev) +{ + if (mlx5_core_is_ecpf(mdev)) + return PAGE_SIZE; + + /* Two MTTs are needed to form an octword. Driver is using a + * single page per MTT for simplicity. Hence the limit of having + * at least 2 pages per WQE. + */ + return BIT(MLX5_MPWRQ_MAX_LOG_WQE_SZ - 1); +} + u16 mlx5e_calc_sq_stop_room(struct mlx5_core_dev *mdev, struct mlx5e_params *params) { bool is_mpwqe = MLX5E_GET_PFLAG(params, MLX5E_PFLAG_SKB_TX_MPWQE);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
index 5b6d528bce9b..9b1a2aed17c3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h@@ -121,6 +121,7 @@ u8 mlx5e_mpwqe_get_min_wqe_bulk(unsigned int wq_sz); u16 mlx5e_get_rq_headroom(struct mlx5_core_dev *mdev, struct mlx5e_params *params, struct mlx5e_rq_opt_param *rqo); +u32 mlx5e_mpwrq_max_page_size(struct mlx5_core_dev *mdev); /* Build queue parameters */
--
2.44.0