xprtrdma: Rename rpcrdma_qp_async_error_upcall

Clean up: Use a function name that is consistent with the RDMA core
API and with other consumers. Because this is a function that is
invoked from outside the rpcrdma.ko module, add an appropriate
documenting comment.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

include/trace/events/rpcrdma.h

@@ -377,7 +377,7 @@ DEFINE_RXPRT_EVENT(xprtrdma_reinsert);
 DEFINE_RXPRT_EVENT(xprtrdma_reconnect);
 DEFINE_RXPRT_EVENT(xprtrdma_inject_dsc);
 
-TRACE_EVENT(xprtrdma_qp_error,
+TRACE_EVENT(xprtrdma_qp_event,
 	TP_PROTO(
 		const struct rpcrdma_xprt *r_xprt,
 		const struct ib_event *event

net/sunrpc/xprtrdma/verbs.c

@@ -127,14 +127,22 @@ rpcrdma_disconnect_worker(struct work_struct *work)
 	xprt_force_disconnect(&r_xprt->rx_xprt);
 }
 
+/**
+ * rpcrdma_qp_event_handler - Handle one QP event (error notification)
+ * @event: details of the event
+ * @context: ep that owns QP where event occurred
+ *
+ * Called from the RDMA provider (device driver) possibly in an interrupt
+ * context.
+ */
 static void
-rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
+rpcrdma_qp_event_handler(struct ib_event *event, void *context)
 {
 	struct rpcrdma_ep *ep = context;
 	struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt,
 						   rx_ep);
 
-	trace_xprtrdma_qp_error(r_xprt, event);
+	trace_xprtrdma_qp_event(r_xprt, event);
 	pr_err("rpcrdma: %s on device %s ep %p\n",
 	       ib_event_msg(event->event), event->device->name, context);
 
@@ -547,7 +555,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
 	if (rc)
 		return rc;
 
-	ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
+	ep->rep_attr.event_handler = rpcrdma_qp_event_handler;
 	ep->rep_attr.qp_context = ep;
 	ep->rep_attr.srq = NULL;
 	ep->rep_attr.cap.max_send_sge = max_sge;