[PATCH v4 21/30] xprtrdma: Add trace points for calls to transport switch methods

[Chuck Lever <chuck.lever@xxxxxxxxxx>]

Name them "trace_xprtrdma_op_*" so they can be easily enabled as a
group. No trace point is added where the generic layer already has
observability.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 include/trace/events/rpcrdma.h  |   10 ++++++----
 net/sunrpc/xprtrdma/transport.c |   18 +++++++++++-------
 2 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index e9fbf7d..3d068bb 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -381,11 +381,13 @@
 DEFINE_RXPRT_EVENT(xprtrdma_conn_start);
 DEFINE_RXPRT_EVENT(xprtrdma_conn_tout);
 DEFINE_RXPRT_EVENT(xprtrdma_create);
-DEFINE_RXPRT_EVENT(xprtrdma_destroy);
+DEFINE_RXPRT_EVENT(xprtrdma_op_destroy);
 DEFINE_RXPRT_EVENT(xprtrdma_remove);
 DEFINE_RXPRT_EVENT(xprtrdma_reinsert);
 DEFINE_RXPRT_EVENT(xprtrdma_reconnect);
-DEFINE_RXPRT_EVENT(xprtrdma_inject_dsc);
+DEFINE_RXPRT_EVENT(xprtrdma_op_inject_dsc);
+DEFINE_RXPRT_EVENT(xprtrdma_op_close);
+DEFINE_RXPRT_EVENT(xprtrdma_op_connect);
 
 TRACE_EVENT(xprtrdma_qp_event,
 	TP_PROTO(
@@ -834,7 +836,7 @@
  ** Allocation/release of rpcrdma_reqs and rpcrdma_reps
  **/
 
-TRACE_EVENT(xprtrdma_allocate,
+TRACE_EVENT(xprtrdma_op_allocate,
 	TP_PROTO(
 		const struct rpc_task *task,
 		const struct rpcrdma_req *req
@@ -864,7 +866,7 @@
 	)
 );
 
-TRACE_EVENT(xprtrdma_rpc_done,
+TRACE_EVENT(xprtrdma_op_free,
 	TP_PROTO(
 		const struct rpc_task *task,
 		const struct rpcrdma_req *req
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 41e4347..cb855b2 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -268,7 +268,7 @@
 {
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 
-	trace_xprtrdma_inject_dsc(r_xprt);
+	trace_xprtrdma_op_inject_dsc(r_xprt);
 	rdma_disconnect(r_xprt->rx_ia.ri_id);
 }
 
@@ -284,7 +284,7 @@
 {
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 
-	trace_xprtrdma_destroy(r_xprt);
+	trace_xprtrdma_op_destroy(r_xprt);
 
 	cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
 
@@ -418,7 +418,7 @@
 out2:
 	rpcrdma_ia_close(&new_xprt->rx_ia);
 out1:
-	trace_xprtrdma_destroy(new_xprt);
+	trace_xprtrdma_op_destroy(new_xprt);
 	xprt_rdma_free_addresses(xprt);
 	xprt_free(xprt);
 	return ERR_PTR(rc);
@@ -428,7 +428,8 @@
  * xprt_rdma_close - close a transport connection
  * @xprt: transport context
  *
- * Called during transport shutdown, reconnect, or device removal.
+ * Called during autoclose or device removal.
+ *
  * Caller holds @xprt's send lock to prevent activity on this
  * transport while the connection is torn down.
  */
@@ -441,6 +442,8 @@
 
 	might_sleep();
 
+	trace_xprtrdma_op_close(r_xprt);
+
 	/* Prevent marshaling and sending of new requests */
 	xprt_clear_connected(xprt);
 
@@ -526,6 +529,7 @@
 {
 	struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 
+	trace_xprtrdma_op_connect(r_xprt);
 	if (r_xprt->rx_ep.rep_connected != 0) {
 		/* Reconnect */
 		schedule_delayed_work(&r_xprt->rx_connect_worker,
@@ -660,11 +664,11 @@
 
 	rqst->rq_buffer = req->rl_sendbuf->rg_base;
 	rqst->rq_rbuffer = req->rl_recvbuf->rg_base;
-	trace_xprtrdma_allocate(task, req);
+	trace_xprtrdma_op_allocate(task, req);
 	return 0;
 
 out_fail:
-	trace_xprtrdma_allocate(task, NULL);
+	trace_xprtrdma_op_allocate(task, NULL);
 	return -ENOMEM;
 }
 
@@ -683,7 +687,7 @@
 
 	if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags))
 		rpcrdma_release_rqst(r_xprt, req);
-	trace_xprtrdma_rpc_done(task, req);
+	trace_xprtrdma_op_free(task, req);
 }
 
 /**