qp_priv_alloc
void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp);
dd->verbs_dev.rdi.driver_f.qp_priv_alloc = qp_priv_alloc;
priv = rdi->driver_f.qp_priv_alloc(rdi, qp);
!rdi->driver_f.qp_priv_alloc ||
if (!rdi->driver_f.qp_priv_alloc ||
void * (*qp_priv_alloc)(struct rvt_dev_info *rdi, struct rvt_qp *qp);