SUNRPC: Move the svc_xdr_recvfrom() tracepoint

Commit c509f15a ("SUNRPC: Split the xdr_buf event class") added
display of the rqst's XID to the svc_xdr_buf_class. However, when
the recvfrom tracepoint fires, rq_xid has yet to be filled in with
the current XID. So it ends up recording the previous XID that was
handled by that svc_rqst.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

include/trace/events/sunrpc.h

@@ -1500,30 +1500,6 @@ SVC_RQST_FLAG_LIST
 #define show_rqstp_flags(flags)						\
 		__print_flags(flags, "|", SVC_RQST_FLAG_LIST)
 
-TRACE_EVENT(svc_recv,
-	TP_PROTO(struct svc_rqst *rqst, int len),
-
-	TP_ARGS(rqst, len),
-
-	TP_STRUCT__entry(
-		__field(u32, xid)
-		__field(int, len)
-		__field(unsigned long, flags)
-		__string(addr, rqst->rq_xprt->xpt_remotebuf)
-	),
-
-	TP_fast_assign(
-		__entry->xid = be32_to_cpu(rqst->rq_xid);
-		__entry->len = len;
-		__entry->flags = rqst->rq_flags;
-		__assign_str(addr, rqst->rq_xprt->xpt_remotebuf);
-	),
-
-	TP_printk("addr=%s xid=0x%08x len=%d flags=%s",
-			__get_str(addr), __entry->xid, __entry->len,
-			show_rqstp_flags(__entry->flags))
-);
-
 TRACE_DEFINE_ENUM(SVC_GARBAGE);
 TRACE_DEFINE_ENUM(SVC_SYSERR);
 TRACE_DEFINE_ENUM(SVC_VALID);

net/sunrpc/svc_xprt.c

@@ -813,8 +813,6 @@ static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt)
 			len = svc_deferred_recv(rqstp);
 		else
 			len = xprt->xpt_ops->xpo_recvfrom(rqstp);
-		if (len > 0)
-			trace_svc_xdr_recvfrom(rqstp, &rqstp->rq_arg);
 		rqstp->rq_stime = ktime_get();
 		rqstp->rq_reserved = serv->sv_max_mesg;
 		atomic_add(rqstp->rq_reserved, &xprt->xpt_reserved);
@@ -868,7 +866,7 @@ int svc_recv(struct svc_rqst *rqstp, long timeout)
 
 	if (serv->sv_stats)
 		serv->sv_stats->netcnt++;
-	trace_svc_recv(rqstp, len);
+	trace_svc_xdr_recvfrom(rqstp, &rqstp->rq_arg);
 	return len;
 out_release:
 	rqstp->rq_res.len = 0;