Manual Pages  — IBV_OPEN_QP

ibv_open_qp - open a shareable queue pair (QP)

SYNOPSIS DESCRIPTION RETURN VALUE NOTES SEE ALSO AUTHORS

#include <infiniband/verbs.h> 

struct ibv_qp *ibv_open_qp(struct ibv_context *context, 
                           struct ibv_qp_open_attr *qp_open_attr); 

ibv_open_qp() opens an existing queue pair (QP) associated with the extended protection domain xrcd. The argument qp_open_attr is an ibv_qp_open_attr struct, as defined in <infiniband/verbs.h>.

struct ibv_qp_open_attr {
uint32_t          comp_mask;  /* Identifies valid fields */
uint32_t          qp_num;     /* QP number */
struct            *ibv_xrcd;  /* XRC domain */
void             *qp_context; /* User defined opaque value */
enum ibv_qp_type  qp_type;    /* QP transport service type */

ibv_destroy_qp() closes the opened QP and destroys the underlying QP if it has no other references. qp.

ibv_open_qp() returns a pointer to the opened QP, or NULL if the request fails. Check the QP number (qp_num) in the returned QP.

ibv_open_qp() will fail if a it is asked to open a QP that does not exist within the xrcd with the specified qp_num and qp_type.