git: 18e57db978d6 - main - IB/mlx5: Report mlx5 packet pacing capabilities when querying device

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=18e57db978d6a13afe316523210d3e8091efe1f9

commit 18e57db978d6a13afe316523210d3e8091efe1f9
Author:     Vag Singh <vag.singh@oneconvergence.com>
AuthorDate: 2025-08-14 06:29:02 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-09-16 14:12:08 +0000

    IB/mlx5: Report mlx5 packet pacing capabilities when querying device
    
    [PATCH 15/31] FreeBSD OFED support for DPDK MLX5 PMD
    
    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:
    
    - The maximum and minimum rate limit in kbps supported by packet pacing.
    - Bitmap showing which QP types are supported by packet pacing operation.
    
    Differential revision:  https://reviews.freebsd.org/D32189
    MFC after:      1 month
---
 sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c   | 13 +++++++++++++
 sys/ofed/include/uapi/rdma/mlx5-abi.h | 13 +++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c b/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c
index 658bbd1a39ff..019780c2ed02 100644
--- a/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c
+++ b/sys/dev/mlx5/mlx5_ib/mlx5_ib_main.c
@@ -859,6 +859,19 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
 		}
 	}
 
+	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 (field_avail(typeof(resp), mlx5_ib_support_multi_pkt_send_wqes,
 			uhw->outlen)) {
 		resp.mlx5_ib_support_multi_pkt_send_wqes =
diff --git a/sys/ofed/include/uapi/rdma/mlx5-abi.h b/sys/ofed/include/uapi/rdma/mlx5-abi.h
index daa233cfcb58..f755bcd793b3 100644
--- a/sys/ofed/include/uapi/rdma/mlx5-abi.h
+++ b/sys/ofed/include/uapi/rdma/mlx5-abi.h
@@ -145,6 +145,18 @@ struct mlx5_ib_rss_caps {
 	__u8 reserved[7];
 };
 
+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;
+};
+
 enum mlx5_ib_cqe_comp_res_format {
 	MLX5_IB_CQE_RES_FORMAT_HASH	= 1 << 0,
 	MLX5_IB_CQE_RES_FORMAT_CSUM	= 1 << 1,
@@ -163,6 +175,7 @@ struct mlx5_ib_query_device_resp {
 	struct	mlx5_ib_tso_caps tso_caps;
 	struct	mlx5_ib_rss_caps rss_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   reserved;
 };