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Commit 1cbe6fc8 authored by Bodong Wang's avatar Bodong Wang Committed by Doug Ledford
Browse files

IB/mlx5: Add support for CQE compressing 



CQE compressing reduces PCI overhead by coalescing and compressing
multiple CQEs into a single merged CQE. Successful compressing
improves message rate especially for small packet traffic.

CQE compressing is supported for all 64B CQE formats (with certain
limitations) generated by RQ/Responder or by SQ/Requestor.

Signed-off-by: default avatarBodong Wang <bodong@mellanox.com>
Reviewed-by: default avatarMatan Barak <matanb@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 7e43a2a5

drivers/infiniband/hw/mlx5/cq.c

+29 −1
Original line number Diff line number Diff line
@@ -731,7 +731,7 @@ static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata, 
			  int entries, u32 **cqb,

			  int *cqe_size, int *index, int *inlen)

{

	struct mlx5_ib_create_cq ucmd;

	struct mlx5_ib_create_cq ucmd = {};

	size_t ucmdlen;

	int page_shift;

	__be64 *pas;
@@ -792,8 +792,36 @@ static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata, 


	*index = to_mucontext(context)->uuari.uars[0].index;



	if (ucmd.cqe_comp_en == 1) {

		if (unlikely((*cqe_size != 64) ||

			     !MLX5_CAP_GEN(dev->mdev, cqe_compression))) {

			err = -EOPNOTSUPP;

			mlx5_ib_warn(dev, "CQE compression is not supported for size %d!\n",

				     *cqe_size);

			goto err_cqb;

		}



		if (unlikely(!ucmd.cqe_comp_res_format ||

			     !(ucmd.cqe_comp_res_format <

			       MLX5_IB_CQE_RES_RESERVED) ||

			     (ucmd.cqe_comp_res_format &

			      (ucmd.cqe_comp_res_format - 1)))) {

			err = -EOPNOTSUPP;

			mlx5_ib_warn(dev, "CQE compression res format %d is not supported!\n",

				     ucmd.cqe_comp_res_format);

			goto err_cqb;

		}



		MLX5_SET(cqc, cqc, cqe_comp_en, 1);

		MLX5_SET(cqc, cqc, mini_cqe_res_format,

			 ilog2(ucmd.cqe_comp_res_format));

	}



	return 0;



err_cqb:

	kfree(cqb);



err_db:

	mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db);

include/uapi/rdma/mlx5-abi.h

+3 −1
Original line number Diff line number Diff line
@@ -149,7 +149,9 @@ struct mlx5_ib_create_cq { 
	__u64	buf_addr;

	__u64	db_addr;

	__u32	cqe_size;

	__u32	reserved; /* explicit padding (optional on i386) */

	__u8    cqe_comp_en;

	__u8    cqe_comp_res_format;

	__u16	reserved; /* explicit padding (optional on i386) */

};



struct mlx5_ib_create_cq_resp {