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IBV_CREATE_CQ(3)        Libibverbs Programmer's Manual        IBV_CREATE_CQ(3)

       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

       ibv_destroy_cq() destroys the CQ cq.

       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.

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

       Dotan Barak <>

libibverbs                        2006-10-31                  IBV_CREATE_CQ(3)