[PATCH] RPC: separate xprt_timer implementations

 Allow transports to hook the retransmit timer interrupt.  Some transports
 calculate their congestion window here so that a retransmit timeout has
 immediate effect on the congestion window.

 Test-plan:
 Use WAN simulation to cause sporadic bursty packet loss.  Look for significant
 regression in performance or client stability.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index 86833b725bb5..443c3f984cf9 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -137,6 +137,7 @@ struct rpc_xprt_ops {
         void            (*connect)(struct rpc_task *task);
         int             (*send_request)(struct rpc_task *task);
         void            (*set_retrans_timeout)(struct rpc_task *task);
+        void            (*timer)(struct rpc_task *task);
         void            (*close)(struct rpc_xprt *xprt);
         void            (*destroy)(struct rpc_xprt *xprt);
 };
@@ -257,6 +258,7 @@ void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);
 void                    xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
 void                    xprt_wait_for_buffer_space(struct rpc_task *task);
 void                    xprt_write_space(struct rpc_xprt *xprt);
+void                    xprt_adjust_cwnd(struct rpc_task *task, int result);
 struct rpc_rqst *       xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid);
 void                    xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied);
 void                    xprt_disconnect(struct rpc_xprt *xprt);