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ibv_create_counters(3) Libibverbs Programmer’s Manual ibv_create_counters(3)


ibv_create_counters, ibv_destroy_counters - Create or destroy a counters handle


#include <infiniband/verbs.h>
struct ibv_counters *
ibv_create_counters(struct ibv_context *context,

struct ibv_counters_init_attr *init_attr); int ibv_destroy_counters(struct ibv_counters *counters);


ibv_create_counters() creates a new counters handle for the RDMA device context.

An ibv_counters handle can be attached to a verbs resource (e.g.: QP, WQ, Flow) statically when these are created.

For example attach an ibv_counters statically to a Flow (struct ibv_flow) during creation of a new Flow by calling ibv_create_flow().

Counters are cleared upon creation and values will be monotonically increasing.

ibv_destroy_counters() releases the counters handle, user should detach the counters object before destroying it.


RDMA device context to create the counters on.
Is an ibv_counters_init_attr struct, as defined in verbs.h.

init_attr Argument

struct ibv_counters_init_attr {

int comp_mask; };
Bitmask specifying what fields in the structure are valid.


ibv_create_counters() returns a pointer to the allocated ibv_counters object, or NULL if the request fails (and sets errno to indicate the failure reason)

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


ibv_create_counters() is not currently supported on this device (ENOSYS may sometimes be returned by old versions of libibverbs).
ibv_create_counters() could not create ibv_counters object, not enough memory
invalid parameter supplied ibv_destroy_counters()


An example of use of ibv_counters is shown in ibv_read_counters


ibv_attach_counters_point_flow, ibv_read_counters, ibv_create_flow


Raed Salem

Alex Rosenbaum

2018-04-02 libibverbs