выделить или освободить домен защиты (PD)  (allocate or deallocate a protection domain (PDs))
  
Имя (Name)
ibv_alloc_pd, ibv_dealloc_pd - allocate or deallocate a
       protection domain (PDs)
Синопсис (Synopsis)
#include <infiniband/verbs.h>
       struct ibv_pd *ibv_alloc_pd(struct ibv_context *context);
       int ibv_dealloc_pd(struct ibv_pd *pd);
Описание (Description)
ibv_alloc_pd() allocates a PD for the RDMA device context
       context.
       ibv_dealloc_pd() deallocates the PD pd.
Возвращаемое значение (Return value)
ibv_alloc_pd() returns a pointer to the allocated PD, or NULL if
       the request fails.
       ibv_dealloc_pd() returns 0 on success, or the value of errno on
       failure (which indicates the failure reason).
Примечание (Note)
ibv_dealloc_pd() may fail if any other resource is still
       associated with the PD being freed.
Смотри также (See also)
ibv_reg_mr(3), ibv_create_srq(3), ibv_create_qp(3),
       ibv_create_ah(3), ibv_create_ah_from_wc(3)