[PATCH 2/3] net/mlx5: support CQE compression on Windows

[Pier Damouny]

> Subject: [PATCH 2/3] net/mlx5: support CQE compression on Windows
> 
> CQE Compression reduces PCI overhead by coalescing and compressing
> multiple CQEs into a single merged CQE.
> 
> Add supported for the CQE compression feature on Windows.
> feature is enabled by default unless not supported by the HW or if the
> rxq_cqe_comp_en PMD argument is explicitly disabled.
> 
> Signed-off-by: Tal Shnaiderman <talshn at nvidia.com>
> ---
>  drivers/common/mlx5/mlx5_devx_cmds.c |  2 ++
> drivers/common/mlx5/mlx5_devx_cmds.h |  1 +
>  drivers/net/mlx5/windows/mlx5_os.c   | 12 ++++++++++++
>  3 files changed, 15 insertions(+)
> 
> diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c
> b/drivers/common/mlx5/mlx5_devx_cmds.c
> index 096bd1d520..a31e4995f5 100644
> --- a/drivers/common/mlx5/mlx5_devx_cmds.c
> +++ b/drivers/common/mlx5/mlx5_devx_cmds.c
> @@ -1062,6 +1062,8 @@ mlx5_devx_cmd_query_hca_attr(void *ctx,
>  	attr->cqe_compression = MLX5_GET(cmd_hca_cap, hcattr,
> cqe_compression);
>  	attr->mini_cqe_resp_flow_tag = MLX5_GET(cmd_hca_cap, hcattr,
>  						mini_cqe_resp_flow_tag);
> +	attr->cqe_compression_128 = MLX5_GET(cmd_hca_cap, hcattr,
> +						cqe_compression_128);
>  	attr->mini_cqe_resp_l3_l4_tag = MLX5_GET(cmd_hca_cap, hcattr,
>  						 mini_cqe_resp_l3_l4_tag);
>  	attr->enhanced_cqe_compression = MLX5_GET(cmd_hca_cap,
> hcattr, diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h
> b/drivers/common/mlx5/mlx5_devx_cmds.h
> index 9e7992b1c6..edcd867c4e 100644
> --- a/drivers/common/mlx5/mlx5_devx_cmds.h
> +++ b/drivers/common/mlx5/mlx5_devx_cmds.h
> @@ -284,6 +284,7 @@ struct mlx5_hca_attr {
>  	uint16_t max_wqe_sz_sq;
>  	uint32_t striding_rq:1;
>  	uint32_t ext_stride_num_range:1;
> +	uint32_t cqe_compression_128:1;
>  	uint32_t set_reg_c:8;
>  	uint32_t nic_flow_table:1;
>  	uint32_t modify_outer_ip_ecn:1;
> diff --git a/drivers/net/mlx5/windows/mlx5_os.c
> b/drivers/net/mlx5/windows/mlx5_os.c
> index 0caa8931e4..6527269663 100644
> --- a/drivers/net/mlx5/windows/mlx5_os.c
> +++ b/drivers/net/mlx5/windows/mlx5_os.c
> @@ -237,6 +237,18 @@ mlx5_os_capabilities_prepare(struct
> mlx5_dev_ctx_shared *sh)
>  	} else {
>  		DRV_LOG(DEBUG, "Tunnel offloading is not supported.");
>  	}
> +	sh->dev_cap.cqe_comp = 0;
> +#if (RTE_CACHE_LINE_SIZE == 128)
> +	if (hca_attr->cqe_compression_128)
> +		sh->dev_cap.cqe_comp = 1;
> +	DRV_LOG(DEBUG, "Rx CQE 128B compression is %ssupported.",
> +		sh->dev_cap.cqe_comp ? "" : "not ");
> +#else
> +	if (hca_attr->cqe_compression)
> +		sh->dev_cap.cqe_comp = 1;
> +	DRV_LOG(DEBUG, "Rx CQE compression is %ssupported.",
> +		sh->dev_cap.cqe_comp ? "" : "not ");
> +#endif
>  	snprintf(sh->dev_cap.fw_ver, 64, "%x.%x.%04x",
>  		 MLX5_GET(initial_seg, pv_iseg, fw_rev_major),
>  		 MLX5_GET(initial_seg, pv_iseg, fw_rev_minor),
> --
> 2.16.1.windows.4

Tested-by: Pier Damouny  <pdamouny at nvidia.com>