ibv_create_cq, ibv_destroy_cq — create or destroy a completion queue (CQ)


#include <infiniband/verbs.h>

struct ibv_cq *ibv_create_cq(struct ibv_context *context, int cqe,
                             void *cq_context,
                             struct ibv_comp_channel *channel,
                             int comp_vector);

int ibv_destroy_cq(struct ibv_cq *cq);


ibv_create_cq() creates a completion queue (CQ) with at least cqe entries for the RDMA device context context. The pointer cq_context will be used to set user context pointer of the CQ structure. The argument channel is optional; if not NULL, the completion channel channel will be used to return completion events.  The CQ will use the completion vector comp_vector for signaling completion events; it must be at least zero and less than context->num_comp_vectors.

ibv_destroy_cq() destroys the CQ cq.

Return Value

ibv_create_cq() returns a pointer to the CQ, or NULL if the request fails.

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


ibv_create_cq() may create a CQ with size greater than or equal to the requested size. Check the cqe attribute in the returned CQ for the actual size.

ibv_destroy_cq() fails if any queue pair is still associated with this CQ.

See Also

ibv_resize_cq(3), ibv_req_notify_cq(3), ibv_ack_cq_events(3), ibv_create_qp(3)


Dotan Barak <dotanba@gmail.com>

Referenced By

ibv_create_comp_channel(3), ibv_create_cq_ex(3), ibv_get_cq_event(3), ibv_modify_cq(3), ibv_req_notify_cq(3), ibv_resize_cq(3).

The man page ibv_destroy_cq(3) is an alias of ibv_create_cq(3).

2006-10-31 Libibverbs Programmer's Manual