NAME¶
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.
SEE ALSO¶
ibv_resize_cq(3),
ibv_req_notify_cq(3),
ibv_ack_cq_events(3),
ibv_create_qp(3)
AUTHORS¶
- Dotan Barak <dotanba@gmail.com>