ibv_query_comp_cntr_caps(3)

NAME

ibv_query_comp_cntr_caps - Query completion counter capabilities

SYNOPSIS

#include <infiniband/verbs.h>
int ibv_query_comp_cntr_caps(struct ibv_context *context,
                             struct ibv_comp_cntr_caps *caps);

DESCRIPTION

ibv_query_comp_cntr_caps() queries the completion counter capabilities of the RDMA device associated with context.

ARGUMENTS

ibv_comp_cntr_caps

struct ibv_comp_cntr_caps {
    uint64_t max_value;
    uint32_t max_counters;
    uint32_t supported_qp_attach_ops;
};

max_value: The maximum value a completion counter can hold. A subsequent increment that would exceed this value wraps the counter to zero.

max_counters: The maximum number of completion counters that can be created on this device.

supported_qp_attach_ops: A bitmask of ibv_qp_attach_comp_cntr_op values indicating which attach operations are supported by the device. See ibv_qp_attach_comp_cntr(3) for the list of operations.

RETURN VALUE

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

ERRORS

ENOTSUP: Completion counters are not supported on this device.

AUTHORS

Michael Margolin ⟨[email protected]⟩\c