From 366090564b812453f531051129b82b63dad8f38b Mon Sep 17 00:00:00 2001 From: Yamin Friedman Date: Mon, 7 Oct 2019 16:59:33 +0300 Subject: RDMA/mlx5: Add capability for max sge to get optimized performance Allows the IB device to provide a value of maximum scatter gather entries per RDMA READ. In certain cases it may be preferable for a device to perform UMR memory registration rather than have many scatter entries in a single RDMA READ. This provides a significant performance increase in devices capable of using different memory registration schemes based on the number of scatter gather entries. This general capability allows each device vendor to fine tune when it is better to use memory registration. Link: https://lore.kernel.org/r/20191007135933.12483-4-leon@kernel.org Signed-off-by: Yamin Friedman Reviewed-by: Or Gerlitz Signed-off-by: Leon Romanovsky Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/mlx5/main.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/infiniband/hw/mlx5/main.c') diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 831539419c30..bb3a4e82ee5a 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1011,6 +1011,8 @@ static int mlx5_ib_query_device(struct ib_device *ibdev, 1 << MLX5_CAP_GEN(mdev, log_max_klm_list_size); props->max_pi_fast_reg_page_list_len = props->max_fast_reg_page_list_len / 2; + props->max_sgl_rd = + MLX5_CAP_GEN(mdev, max_sgl_for_optimized_performance); get_atomic_caps_qp(dev, props); props->masked_atomic_cap = IB_ATOMIC_NONE; props->max_mcast_grp = 1 << MLX5_CAP_GEN(mdev, log_max_mcg); -- cgit v1.2.3-59-g8ed1b