IB/mlx5: Expose multi-packet RQ capabilities

This patch reports the device's striding RQ capabilities to
the user-space:
- min/max_single_stride_log_num_of_bytes: Log of min/max number of
  bytes in a single stride.
- min/max_single_wqe_log_num_of_strides: Log of min/max number of
  strides in a single WQE.
- supported_qpts: A bit mask to know which QP types support multi-
  packet RQ, for now only Raw Packet QPs.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 552f7bd4ecc38bf17aff093fa037b423c4d0026b..02da3f58f29636f6d2df4457879c672909dd3388 100644 (file)
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -848,6 +848,22 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
                }
        }
 
+       if (field_avail(typeof(resp), striding_rq_caps, uhw->outlen)) {
+               resp.response_length += sizeof(resp.striding_rq_caps);
+               if (MLX5_CAP_GEN(mdev, striding_rq)) {
+                       resp.striding_rq_caps.min_single_stride_log_num_of_bytes =
+                               MLX5_MIN_SINGLE_STRIDE_LOG_NUM_BYTES;
+                       resp.striding_rq_caps.max_single_stride_log_num_of_bytes =
+                               MLX5_MAX_SINGLE_STRIDE_LOG_NUM_BYTES;
+                       resp.striding_rq_caps.min_single_wqe_log_num_of_strides =
+                               MLX5_MIN_SINGLE_WQE_LOG_NUM_STRIDES;
+                       resp.striding_rq_caps.max_single_wqe_log_num_of_strides =
+                               MLX5_MAX_SINGLE_WQE_LOG_NUM_STRIDES;
+                       resp.striding_rq_caps.supported_qpts =
+                               BIT(IB_QPT_RAW_PACKET);
+               }
+       }
+
        if (uhw->outlen) {
                err = ib_copy_to_udata(uhw, &resp, resp.response_length);
 

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 189e80cd6b2f3c23955dd9bb228b8e1adebaef95..8de40852818b6670adc57dbdb50556e7f3c4df25 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -256,6 +256,11 @@ enum mlx5_ib_wq_flags {
        MLX5_IB_WQ_FLAGS_DELAY_DROP = 0x1,
 };
 
+#define MLX5_MIN_SINGLE_WQE_LOG_NUM_STRIDES 9
+#define MLX5_MAX_SINGLE_WQE_LOG_NUM_STRIDES 16
+#define MLX5_MIN_SINGLE_STRIDE_LOG_NUM_BYTES 6
+#define MLX5_MAX_SINGLE_STRIDE_LOG_NUM_BYTES 13
+
 struct mlx5_ib_rwq {
        struct ib_wq            ibwq;
        struct mlx5_core_qp     core_qp;

diff --git a/include/uapi/rdma/mlx5-abi.h b/include/uapi/rdma/mlx5-abi.h
index 1791bf123ba96453564ec65fda99c27af062c052..0832d95022001b5a687b75989be1382648c456d4 100644 (file)
--- a/include/uapi/rdma/mlx5-abi.h
+++ b/include/uapi/rdma/mlx5-abi.h
@@ -190,6 +190,19 @@ struct mlx5_ib_sw_parsing_caps {
        __u32 supported_qpts;
 };
 
+struct mlx5_ib_striding_rq_caps {
+       __u32 min_single_stride_log_num_of_bytes;
+       __u32 max_single_stride_log_num_of_bytes;
+       __u32 min_single_wqe_log_num_of_strides;
+       __u32 max_single_wqe_log_num_of_strides;
+
+       /* 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;
+};
+
 struct mlx5_ib_query_device_resp {
        __u32   comp_mask;
        __u32   response_length;
@@ -200,6 +213,7 @@ struct mlx5_ib_query_device_resp {
        __u32   mlx5_ib_support_multi_pkt_send_wqes;
        __u32   reserved;
        struct mlx5_ib_sw_parsing_caps sw_parsing_caps;
+       struct mlx5_ib_striding_rq_caps striding_rq_caps;
 };
 
 struct mlx5_ib_create_cq {