ibv_create_cq, ibv_destroy_cq - create or destroy a completion queue (CQ)
SYNOPSIS
#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);
DESCRIPTION
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).
NOTES
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.