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IB/mlx5: Add support for CQE compressing

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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: Bodong Wang <bodong@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bodong Wang 2016-10-31 12:16:45 +02:00 committed by Doug Ledford
parent 7e43a2a5ba
commit 1cbe6fc86c
2 changed files with 32 additions and 2 deletions
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30
drivers/infiniband/hw/mlx5/cq.c
View File

@ -731,7 +731,7 @@ static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata,
int entries, u32 **cqb, int entries, u32 **cqb,
int *cqe_size, int *index, int *inlen) int *cqe_size, int *index, int *inlen)
{ {
struct mlx5_ib_create_cq ucmd; struct mlx5_ib_create_cq ucmd = {};
size_t ucmdlen; size_t ucmdlen;
int page_shift; int page_shift;
__be64 *pas; __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; *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; return 0;
err_cqb:
kfree(cqb);
err_db: err_db:
mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db); mlx5_ib_db_unmap_user(to_mucontext(context), &cq->db);

4
include/uapi/rdma/mlx5-abi.h
View File

@ -149,7 +149,9 @@ struct mlx5_ib_create_cq {
__u64 buf_addr; __u64 buf_addr;
__u64 db_addr; __u64 db_addr;
__u32 cqe_size; __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 { struct mlx5_ib_create_cq_resp {