svcrdma: Enqueue after setting XPT_CLOSE in completion handlers

I noticed the server was sometimes not closing the connection after
a flushed Send. For example, if the client responds with an RNR NAK
to a Reply from the server, that client might be deadlocked, and
thus wouldn't send any more traffic. Thus the server wouldn't have
any opportunity to notice the XPT_CLOSE bit has been set.

Enqueue the transport so that svcxprt notices the bit even if there
is no more transport activity after a flushed completion, QP access
error, or device removal event.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-By: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 5caf8e722a11..46ec069150d5 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -290,6 +290,7 @@ static void qp_event_handler(struct ib_event *event, void *context)
                         ib_event_msg(event->event), event->event,
                         event->element.qp);
                 set_bit(XPT_CLOSE, &xprt->xpt_flags);
+                svc_xprt_enqueue(xprt);
                 break;
         }
 }
@@ -322,8 +323,7 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
         set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
         if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
                 goto out;
-        svc_xprt_enqueue(&xprt->sc_xprt);
-        goto out;
+        goto out_enqueue;
 
 flushed:
         if (wc->status != IB_WC_WR_FLUSH_ERR)
@@ -333,6 +333,8 @@ flushed:
         set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
         svc_rdma_put_context(ctxt, 1);
 
+out_enqueue:
+        svc_xprt_enqueue(&xprt->sc_xprt);
 out:
         svc_xprt_put(&xprt->sc_xprt);
 }
@@ -358,6 +360,7 @@ void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
 
         if (unlikely(wc->status != IB_WC_SUCCESS)) {
                 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+                svc_xprt_enqueue(&xprt->sc_xprt);
                 if (wc->status != IB_WC_WR_FLUSH_ERR)
                         pr_err("svcrdma: Send: %s (%u/0x%x)\n",
                                ib_wc_status_msg(wc->status),
@@ -569,8 +572,10 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id,
         case RDMA_CM_EVENT_DEVICE_REMOVAL:
                 dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
                         xprt, cma_id);
-                if (xprt)
+                if (xprt) {
                         set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
+                        svc_xprt_enqueue(&xprt->sc_xprt);
+                }
                 break;
 
         default: