RDMA/cxgb4: Make sure flush CQ entries are collected on connection close

At the time when a peer closes the connection, iw_cxgb4 will not send
a cq event if ibqp.uobject exists.  In that case, its possible for a
user application to get blocked in ibv_get_cq_event().

To resolve this, call the cq's comp_handler to unblock any read from
ibv_get_cq_event().  This will trigger userspace to poll the cq and
collect flush status completions for any pending work requests.

Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index a41578e48c7b..892fa7c6d310 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -966,8 +966,12 @@ static void flush_qp(struct c4iw_qp *qhp)
         if (qhp->ibqp.uobject) {
                 t4_set_wq_in_error(&qhp->wq);
                 t4_set_cq_in_error(&rchp->cq);
-                if (schp != rchp)
+                (*rchp->ibcq.comp_handler)(&rchp->ibcq, rchp->ibcq.cq_context);
+                if (schp != rchp) {
                         t4_set_cq_in_error(&schp->cq);
+                        (*schp->ibcq.comp_handler)(&schp->ibcq,
+                                        schp->ibcq.cq_context);
+                }
                 return;
         }
         __flush_qp(qhp, rchp, schp);