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>

3 files changed, 29 insertions, 5 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_qp.c b/drivers/infiniband/hw/ipath/ipath_qp.c
index a8c4a6b03d7a..6a41fdbc8e57 100644
--- a/drivers/infiniband/hw/ipath/ipath_qp.c
+++ b/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;
 
diff --git a/drivers/infiniband/hw/ipath/ipath_rc.c b/drivers/infiniband/hw/ipath/ipath_rc.c
index 53259daeb4f8..5c29b2bfea17 100644
--- a/drivers/infiniband/hw/ipath/ipath_rc.c
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c
@@ -1497,11 +1497,21 @@ send_ack:
 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)
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.h b/drivers/infiniband/hw/ipath/ipath_verbs.h
index 619ad728b07b..a1972295bffd 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h
+++ b/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);