Fix rdmacm race

cm_open_server() does the synchronization send_mesg() prior
to doing the listen.  This sets up a race where the client can
initiate a connection prior to having the listen having been done.

Fix by moving the send_msg() call until after the rdma_listen().

Change-Id: I1d271c7d25801749a2ed138fadbf97efbbe51efd
Reviewed-by: Estela, Henry R <henry.r.estela@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>

Author: Mike Marciniszyn

src/rdma.c

@@ -1874,10 +1874,11 @@ cm_open_server(DEVICE *dev)
         error(0, "rdma_bind_addr failed");
     port = ntohs(rdma_get_src_port(cm->id));
     encode_uint32(&port, port);
-    send_mesg(&port, sizeof(port), "RDMA CM TCP IPv4 server port");
 
     if (rdma_listen(cm->id, 0) != 0)
         error(0, "rdma_listen failed");
+    send_mesg(&port, sizeof(port), "RDMA CM TCP IPv4 server port");
+
     cm_expect_event(dev, RDMA_CM_EVENT_CONNECT_REQUEST);
     cm->id = cm->event->id;
     rd_create_qp(dev, cm->id->verbs, cm->id);