IB/ipath: Implement IB_EVENT_QP_LAST_WQE_REACHED

This patch implements the IB_EVENT_QP_LAST_WQE_REACHED event which is
needed by ib_ipoib to destroy the QP when used in connected mode.
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ipath/ipath_qp.c

@@ -377,13 +377,15 @@ static void ipath_reset_qp(struct ipath_qp *qp)
  * @err: the receive completion error to signal if a RWQE is active
  *
  * Flushes both send and receive work queues.
+ * Returns true if last WQE event should be generated.
  * The QP s_lock should be held and interrupts disabled.
  */
 
-void ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err)
+int ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err)
 {
 	struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
 	struct ib_wc wc;
+	int ret = 0;
 
 	ipath_dbg("QP%d/%d in error state\n",
 		  qp->ibqp.qp_num, qp->remote_qpn);
@@ -454,7 +456,10 @@ void ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err)
 		wq->tail = tail;
 
 		spin_unlock(&qp->r_rq.lock);
-	}
+	} else if (qp->ibqp.event_handler)
+		ret = 1;
+
+	return ret;
 }
 
 /**
@@ -473,6 +478,7 @@ int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 	struct ipath_qp *qp = to_iqp(ibqp);
 	enum ib_qp_state cur_state, new_state;
 	unsigned long flags;
+	int lastwqe = 0;
 	int ret;
 
 	spin_lock_irqsave(&qp->s_lock, flags);
@@ -532,7 +538,7 @@ int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 		break;
 
 	case IB_QPS_ERR:
-		ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR);
+		lastwqe = ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR);
 		break;
 
 	default:
@@ -591,6 +597,14 @@ int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 	qp->state = new_state;
 	spin_unlock_irqrestore(&qp->s_lock, flags);
 
+	if (lastwqe) {
+		struct ib_event ev;
+
+		ev.device = qp->ibqp.device;
+		ev.element.qp = &qp->ibqp;
+		ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
+		qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
+	}
 	ret = 0;
 	goto bail;
 

drivers/infiniband/hw/ipath/ipath_rc.c

@@ -1497,11 +1497,21 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
 static void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err)
 {
 	unsigned long flags;
+	int lastwqe;
 
 	spin_lock_irqsave(&qp->s_lock, flags);
 	qp->state = IB_QPS_ERR;
-	ipath_error_qp(qp, err);
+	lastwqe = ipath_error_qp(qp, err);
 	spin_unlock_irqrestore(&qp->s_lock, flags);
+
+	if (lastwqe) {
+		struct ib_event ev;
+
+		ev.device = qp->ibqp.device;
+		ev.element.qp = &qp->ibqp;
+		ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
+		qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
+	}
 }
 
 static inline void ipath_update_ack_queue(struct ipath_qp *qp, unsigned n)

drivers/infiniband/hw/ipath/ipath_verbs.h

@@ -672,7 +672,7 @@ struct ib_qp *ipath_create_qp(struct ib_pd *ibpd,
 
 int ipath_destroy_qp(struct ib_qp *ibqp);
 
-void ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err);
+int ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err);
 
 int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 		    int attr_mask, struct ib_udata *udata);