[PATCH v1 4/5] xprtrdma: Replace dprintk() in rpcrdma_update_connect_private()

[Chuck Lever <chuck.lever@xxxxxxxxxx>]

Clean up: Use a single trace point to record each connection's
negotiated inline thresholds and the computed maximum byte size
of transport headers.

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 include/trace/events/rpcrdma.h |   36 ++++++++++++++++++++++++++++++++++++
 net/sunrpc/xprtrdma/rpc_rdma.c |    4 ----
 net/sunrpc/xprtrdma/verbs.c    |   21 ++++++++++-----------
 3 files changed, 46 insertions(+), 15 deletions(-)

diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index 465c1b0..081831d 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -371,6 +371,42 @@
 	)
 );
 
+TRACE_EVENT(xprtrdma_inline_thresh,
+	TP_PROTO(
+		const struct rpcrdma_xprt *r_xprt
+	),
+
+	TP_ARGS(r_xprt),
+
+	TP_STRUCT__entry(
+		__field(const void *, r_xprt)
+		__field(unsigned int, inline_send)
+		__field(unsigned int, inline_recv)
+		__field(unsigned int, max_send)
+		__field(unsigned int, max_recv)
+		__string(addr, rpcrdma_addrstr(r_xprt))
+		__string(port, rpcrdma_portstr(r_xprt))
+	),
+
+	TP_fast_assign(
+		const struct rpcrdma_ep *ep = &r_xprt->rx_ep;
+
+		__entry->r_xprt = r_xprt;
+		__entry->inline_send = ep->rep_inline_send;
+		__entry->inline_recv = ep->rep_inline_recv;
+		__entry->max_send = ep->rep_max_inline_send;
+		__entry->max_recv = ep->rep_max_inline_recv;
+		__assign_str(addr, rpcrdma_addrstr(r_xprt));
+		__assign_str(port, rpcrdma_portstr(r_xprt));
+	),
+
+	TP_printk("peer=[%s]:%s r_xprt=%p neg send/recv=%u/%u, calc send/recv=%u/%u",
+		__get_str(addr), __get_str(port), __entry->r_xprt,
+		__entry->inline_send, __entry->inline_recv,
+		__entry->max_send, __entry->max_recv
+	)
+);
+
 DEFINE_CONN_EVENT(connect);
 DEFINE_CONN_EVENT(disconnect);
 
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 26d334c..aec3beb 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -78,8 +78,6 @@ static unsigned int rpcrdma_max_call_header_size(unsigned int maxsegs)
 	size += rpcrdma_segment_maxsz * sizeof(__be32);
 	size += sizeof(__be32);	/* list discriminator */
 
-	dprintk("RPC:       %s: max call header size = %u\n",
-		__func__, size);
 	return size;
 }
 
@@ -100,8 +98,6 @@ static unsigned int rpcrdma_max_reply_header_size(unsigned int maxsegs)
 	size += maxsegs * rpcrdma_segment_maxsz * sizeof(__be32);
 	size += sizeof(__be32);	/* list discriminator */
 
-	dprintk("RPC:       %s: max reply header size = %u\n",
-		__func__, size);
 	return size;
 }
 
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 92bdf05..77c7dd7 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -177,11 +177,11 @@ static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt)
 	rpcrdma_recv_buffer_put(rep);
 }
 
-static void
-rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
-			       struct rdma_conn_param *param)
+static void rpcrdma_update_cm_private(struct rpcrdma_xprt *r_xprt,
+				      struct rdma_conn_param *param)
 {
 	const struct rpcrdma_connect_private *pmsg = param->private_data;
+	struct rpcrdma_ep *ep = &r_xprt->rx_ep;
 	unsigned int rsize, wsize;
 
 	/* Default settings for RPC-over-RDMA Version One */
@@ -197,13 +197,11 @@ static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt)
 		wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
 	}
 
-	if (rsize < r_xprt->rx_ep.rep_inline_recv)
-		r_xprt->rx_ep.rep_inline_recv = rsize;
-	if (wsize < r_xprt->rx_ep.rep_inline_send)
-		r_xprt->rx_ep.rep_inline_send = wsize;
-	dprintk("RPC:       %s: max send %u, max recv %u\n", __func__,
-		r_xprt->rx_ep.rep_inline_send,
-		r_xprt->rx_ep.rep_inline_recv);
+	if (rsize < ep->rep_inline_recv)
+		ep->rep_inline_recv = rsize;
+	if (wsize < ep->rep_inline_send)
+		ep->rep_inline_send = wsize;
+
 	rpcrdma_set_max_header_sizes(r_xprt);
 }
 
@@ -257,7 +255,8 @@ static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt)
 	case RDMA_CM_EVENT_ESTABLISHED:
 		++xprt->connect_cookie;
 		ep->rep_connected = 1;
-		rpcrdma_update_connect_private(r_xprt, &event->param.conn);
+		rpcrdma_update_cm_private(r_xprt, &event->param.conn);
+		trace_xprtrdma_inline_thresh(r_xprt);
 		wake_up_all(&ep->rep_connect_wait);
 		break;
 	case RDMA_CM_EVENT_CONNECT_ERROR: