Commit d949167d authored by Bodong Wang's avatar Bodong Wang Committed by Doug Ledford
Browse files

IB/mlx5: Report mlx5 packet pacing capabilities when querying device 



Enable mlx5 based hardware to report packet pacing capabilities
from kernel to user space. Packet pacing allows to limit the rate to any
number between the maximum and minimum, based on user settings.

The capabilities are exposed to user space through query_device by uhw.
The following capabilities are reported:

1. The maximum and minimum rate limit in kbps supported by packet pacing.
2. Bitmap showing which QP types are supported by packet pacing operation.

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 ca5b91d6

drivers/infiniband/hw/mlx5/main.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -693,6 +693,19 @@ static int mlx5_ib_query_device(struct ib_device *ibdev, 
		resp.response_length += sizeof(resp.cqe_comp_caps);

		resp.response_length += sizeof(resp.cqe_comp_caps);

	}

	}





	if (field_avail(typeof(resp), packet_pacing_caps, uhw->outlen)) {

		if (MLX5_CAP_QOS(mdev, packet_pacing) &&

		    MLX5_CAP_GEN(mdev, qos)) {

			resp.packet_pacing_caps.qp_rate_limit_max =

				MLX5_CAP_QOS(mdev, packet_pacing_max_rate);

			resp.packet_pacing_caps.qp_rate_limit_min =

				MLX5_CAP_QOS(mdev, packet_pacing_min_rate);

			resp.packet_pacing_caps.supported_qpts |=

				1 << IB_QPT_RAW_PACKET;

		}

		resp.response_length += sizeof(resp.packet_pacing_caps);

	}



	if (uhw->outlen) {

	if (uhw->outlen) {

		err = ib_copy_to_udata(uhw, &resp, resp.response_length);

		err = ib_copy_to_udata(uhw, &resp, resp.response_length);

include/uapi/rdma/mlx5-abi.h

+13 −0
Original line number Original line Diff line number Diff line
@@ -136,12 +136,25 @@ struct mlx5_ib_cqe_comp_caps { 
	__u32 supported_format; /* enum mlx5_ib_cqe_comp_res_format */

	__u32 supported_format; /* enum mlx5_ib_cqe_comp_res_format */

};

};





struct mlx5_packet_pacing_caps {

	__u32 qp_rate_limit_min;

	__u32 qp_rate_limit_max; /* In kpbs */



	/* Corresponding bit will be set if qp type from

	 * 'enum ib_qp_type' is supported, e.g.

	 * supported_qpts |= 1 << IB_QPT_RAW_PACKET

	 */

	__u32 supported_qpts;

	__u32 reserved;

};



struct mlx5_ib_query_device_resp {

struct mlx5_ib_query_device_resp {

	__u32	comp_mask;

	__u32	comp_mask;

	__u32	response_length;

	__u32	response_length;

	struct	mlx5_ib_tso_caps tso_caps;

	struct	mlx5_ib_tso_caps tso_caps;

	struct	mlx5_ib_rss_caps rss_caps;

	struct	mlx5_ib_rss_caps rss_caps;

	struct	mlx5_ib_cqe_comp_caps cqe_comp_caps;

	struct	mlx5_ib_cqe_comp_caps cqe_comp_caps;

	struct	mlx5_packet_pacing_caps packet_pacing_caps;

	__u32	mlx5_ib_support_multi_pkt_send_wqes;

	__u32	mlx5_ib_support_multi_pkt_send_wqes;

	__u32	reserved;

	__u32	reserved;

};

};

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