IB/hfi1: Report pid in qp_stats to aid debug

Tracking user/QP ownership is needed to debug issues with
user ULPs like OpenMPI.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rdmavt/qp.c

@@ -786,6 +786,7 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
 				goto bail_ip;
 			}
 		}
+		qp->pid = current->pid;
 	}
 
 	spin_lock(&rdi->n_qps_lock);

drivers/staging/rdma/hfi1/qp.c

@@ -678,7 +678,7 @@ void qp_iter_print(struct seq_file *s, struct qp_iter *iter)
 	wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 	send_context = qp_to_send_context(qp, priv->s_sc);
 	seq_printf(s,
-		   "N %d %s QP%x R %u %s %u %u %u f=%x %u %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u %u) QP%x LID %x SL %u MTU %u %u %u %u SDE %p,%u SC %p,%u CQ %u %u\n",
+		   "N %d %s QP%x R %u %s %u %u %u f=%x %u %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u %u) QP%x LID %x SL %u MTU %u %u %u %u SDE %p,%u SC %p,%u CQ %u %u PID %d\n",
 		   iter->n,
 		   qp_idle(qp) ? "I" : "B",
 		   qp->ibqp.qp_num,
@@ -712,7 +712,8 @@ void qp_iter_print(struct seq_file *s, struct qp_iter *iter)
 		   send_context,
 		   send_context ? send_context->sw_index : 0,
 		   ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->head,
-		   ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->tail);
+		   ibcq_to_rvtcq(qp->ibqp.send_cq)->queue->tail,
+		   qp->pid);
 }
 
 void qp_comm_est(struct rvt_qp *qp)

include/rdma/rdmavt_qp.h

@@ -251,6 +251,7 @@ struct rvt_qp {
 
 	enum ib_mtu path_mtu;
 	int srate_mbps;		/* s_srate (below) converted to Mbit/s */
+	pid_t pid;		/* pid for user mode QPs */
 	u32 remote_qpn;
 	u32 qkey;               /* QKEY for this QP (for UD or RD) */
 	u32 s_size;             /* send work queue size */