HNSDV_QUERY_DEVICE(3)       HNS Direct Verbs Manual      HNSDV_QUERY_DEVICE(3)

NAME
       hnsdv_query_device - Query hns device specific attributes

SYNOPSIS
              #include <infiniband/hnsdv.h>
              int hnsdv_query_device(struct ibv_context *context,
                                     struct hnsdv_context *attrs_out);

DESCRIPTION
       hnsdv_query_device() Queries hns device specific attributes.

ARGUMENTS
       Please see ibv_query_device(3) man page for context.

   attrs_out
              struct hnsdv_context {
                      uint64_t comp_mask;
                      uint64_t flags;
                      uint8_t congest_type;
                      uint8_t reserved[7];
              };

       comp_mask
              Bitmask specifying what fields in the structure are valid:

              HNSDV_CONTEXT_MASK_CONGEST_TYPE: Congestion control algorithm is
              supported.

       congest_type
              Bitmask of supported congestion control algorithms.

              HNSDV_QP_CREATE_ENABLE_DCQCN: Data Center Quantized Congestion
              Notification HNSDV_QP_CREATE_ENABLE_LDCP: Low Delay Control
              Protocol HNSDV_QP_CREATE_ENABLE_HC3: Huawei Converged Congestion
              Control HNSDV_QP_CREATE_ENABLE_DIP: Destination IP based
              Quantized Congestion Notification

RETURN VALUE
       hnsdv_query_device() returns 0 on success, or the value of errno on
       failure (which indicates the failure reason).

SEE ALSO
       ibv_query_device(3)

NOTES
       o flags is an out field and currently has no values.

AUTHORS
       Junxian Huang <huangjunxian6@hisilicon.com>

hns                               2024-02-06             HNSDV_QUERY_DEVICE(3)