SUNRPC: Refactor xprt_request_wait_receive()

Convert the transport callback to actually put the request to sleep
instead of just setting a timeout. This is in preparation for
rpc_sleep_on_timeout().
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>

include/linux/sunrpc/xprt.h

@@ -143,7 +143,7 @@ struct rpc_xprt_ops {
 	void		(*buf_free)(struct rpc_task *task);
 	void		(*prepare_request)(struct rpc_rqst *req);
 	int		(*send_request)(struct rpc_rqst *req);
-	void		(*set_retrans_timeout)(struct rpc_task *task);
+	void		(*wait_for_reply_request)(struct rpc_task *task);
 	void		(*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
 	void		(*release_request)(struct rpc_task *task);
 	void		(*close)(struct rpc_xprt *xprt);
@@ -378,8 +378,8 @@ xprt_disable_swap(struct rpc_xprt *xprt)
 int			xprt_register_transport(struct xprt_class *type);
 int			xprt_unregister_transport(struct xprt_class *type);
 int			xprt_load_transport(const char *);
-void			xprt_set_retrans_timeout_def(struct rpc_task *task);
-void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);
+void			xprt_wait_for_reply_request_def(struct rpc_task *task);
+void			xprt_wait_for_reply_request_rtt(struct rpc_task *task);
 void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
 void			xprt_wait_for_buffer_space(struct rpc_xprt *xprt);
 bool			xprt_write_space(struct rpc_xprt *xprt);

net/sunrpc/xprt.c

@@ -554,41 +554,6 @@ bool xprt_write_space(struct rpc_xprt *xprt)
 }
 EXPORT_SYMBOL_GPL(xprt_write_space);
 
-/**
- * xprt_set_retrans_timeout_def - set a request's retransmit timeout
- * @task: task whose timeout is to be set
- *
- * Set a request's retransmit timeout based on the transport's
- * default timeout parameters.  Used by transports that don't adjust
- * the retransmit timeout based on round-trip time estimation.
- */
-void xprt_set_retrans_timeout_def(struct rpc_task *task)
-{
-	task->tk_timeout = task->tk_rqstp->rq_timeout;
-}
-EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def);
-
-/**
- * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout
- * @task: task whose timeout is to be set
- *
- * Set a request's retransmit timeout using the RTT estimator.
- */
-void xprt_set_retrans_timeout_rtt(struct rpc_task *task)
-{
-	int timer = task->tk_msg.rpc_proc->p_timer;
-	struct rpc_clnt *clnt = task->tk_client;
-	struct rpc_rtt *rtt = clnt->cl_rtt;
-	struct rpc_rqst *req = task->tk_rqstp;
-	unsigned long max_timeout = clnt->cl_timeout->to_maxval;
-
-	task->tk_timeout = rpc_calc_rto(rtt, timer);
-	task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries;
-	if (task->tk_timeout > max_timeout || task->tk_timeout == 0)
-		task->tk_timeout = max_timeout;
-}
-EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt);
-
 static void xprt_reset_majortimeo(struct rpc_rqst *req)
 {
 	const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout;
@@ -1102,6 +1067,47 @@ static void xprt_timer(struct rpc_task *task)
 		task->tk_status = 0;
 }
 
+/**
+ * xprt_wait_for_reply_request_def - wait for reply
+ * @task: pointer to rpc_task
+ *
+ * Set a request's retransmit timeout based on the transport's
+ * default timeout parameters.  Used by transports that don't adjust
+ * the retransmit timeout based on round-trip time estimation,
+ * and put the task to sleep on the pending queue.
+ */
+void xprt_wait_for_reply_request_def(struct rpc_task *task)
+{
+	struct rpc_rqst *req = task->tk_rqstp;
+
+	task->tk_timeout = req->rq_timeout;
+	rpc_sleep_on(&req->rq_xprt->pending, task, xprt_timer);
+}
+EXPORT_SYMBOL_GPL(xprt_wait_for_reply_request_def);
+
+/**
+ * xprt_wait_for_reply_request_rtt - wait for reply using RTT estimator
+ * @task: pointer to rpc_task
+ *
+ * Set a request's retransmit timeout using the RTT estimator,
+ * and put the task to sleep on the pending queue.
+ */
+void xprt_wait_for_reply_request_rtt(struct rpc_task *task)
+{
+	int timer = task->tk_msg.rpc_proc->p_timer;
+	struct rpc_clnt *clnt = task->tk_client;
+	struct rpc_rtt *rtt = clnt->cl_rtt;
+	struct rpc_rqst *req = task->tk_rqstp;
+	unsigned long max_timeout = clnt->cl_timeout->to_maxval;
+
+	task->tk_timeout = rpc_calc_rto(rtt, timer);
+	task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries;
+	if (task->tk_timeout > max_timeout || task->tk_timeout == 0)
+		task->tk_timeout = max_timeout;
+	rpc_sleep_on(&req->rq_xprt->pending, task, xprt_timer);
+}
+EXPORT_SYMBOL_GPL(xprt_wait_for_reply_request_rtt);
+
 /**
  * xprt_request_wait_receive - wait for the reply to an RPC request
  * @task: RPC task about to send a request
@@ -1121,8 +1127,7 @@ void xprt_request_wait_receive(struct rpc_task *task)
 	 */
 	spin_lock(&xprt->queue_lock);
 	if (test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) {
-		xprt->ops->set_retrans_timeout(task);
-		rpc_sleep_on(&xprt->pending, task, xprt_timer);
+		xprt->ops->wait_for_reply_request(task);
 		/*
 		 * Send an extra queue wakeup call if the
 		 * connection was dropped in case the call to

net/sunrpc/xprtrdma/svc_rdma_backchannel.c

@@ -261,7 +261,7 @@ static const struct rpc_xprt_ops xprt_rdma_bc_procs = {
 	.buf_alloc		= xprt_rdma_bc_allocate,
 	.buf_free		= xprt_rdma_bc_free,
 	.send_request		= xprt_rdma_bc_send_request,
-	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.wait_for_reply_request	= xprt_wait_for_reply_request_def,
 	.close			= xprt_rdma_bc_close,
 	.destroy		= xprt_rdma_bc_put,
 	.print_stats		= xprt_rdma_print_stats

net/sunrpc/xprtrdma/transport.c

@@ -815,7 +815,7 @@ static const struct rpc_xprt_ops xprt_rdma_procs = {
 	.alloc_slot		= xprt_rdma_alloc_slot,
 	.free_slot		= xprt_rdma_free_slot,
 	.release_request	= xprt_release_rqst_cong,       /* ditto */
-	.set_retrans_timeout	= xprt_set_retrans_timeout_def, /* ditto */
+	.wait_for_reply_request	= xprt_wait_for_reply_request_def, /* ditto */
 	.timer			= xprt_rdma_timer,
 	.rpcbind		= rpcb_getport_async,	/* sunrpc/rpcb_clnt.c */
 	.set_port		= xprt_rdma_set_port,

net/sunrpc/xprtsock.c

@@ -2690,7 +2690,7 @@ static const struct rpc_xprt_ops xs_local_ops = {
 	.buf_free		= rpc_free,
 	.prepare_request	= xs_stream_prepare_request,
 	.send_request		= xs_local_send_request,
-	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.wait_for_reply_request	= xprt_wait_for_reply_request_def,
 	.close			= xs_close,
 	.destroy		= xs_destroy,
 	.print_stats		= xs_local_print_stats,
@@ -2710,7 +2710,7 @@ static const struct rpc_xprt_ops xs_udp_ops = {
 	.buf_alloc		= rpc_malloc,
 	.buf_free		= rpc_free,
 	.send_request		= xs_udp_send_request,
-	.set_retrans_timeout	= xprt_set_retrans_timeout_rtt,
+	.wait_for_reply_request	= xprt_wait_for_reply_request_rtt,
 	.timer			= xs_udp_timer,
 	.release_request	= xprt_release_rqst_cong,
 	.close			= xs_close,
@@ -2733,7 +2733,7 @@ static const struct rpc_xprt_ops xs_tcp_ops = {
 	.buf_free		= rpc_free,
 	.prepare_request	= xs_stream_prepare_request,
 	.send_request		= xs_tcp_send_request,
-	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.wait_for_reply_request	= xprt_wait_for_reply_request_def,
 	.close			= xs_tcp_shutdown,
 	.destroy		= xs_destroy,
 	.set_connect_timeout	= xs_tcp_set_connect_timeout,
@@ -2761,7 +2761,7 @@ static const struct rpc_xprt_ops bc_tcp_ops = {
 	.buf_alloc		= bc_malloc,
 	.buf_free		= bc_free,
 	.send_request		= bc_send_request,
-	.set_retrans_timeout	= xprt_set_retrans_timeout_def,
+	.wait_for_reply_request	= xprt_wait_for_reply_request_def,
 	.close			= bc_close,
 	.destroy		= bc_destroy,
 	.print_stats		= xs_tcp_print_stats,