[PATCH] RPC: add API to set transport-specific timeouts

 Prepare the way to remove the "xprt->nocong" variable by adding a callout
 to the RPC client transport switch API to handle setting RPC retransmit
 timeouts.

 Add a pair of generic helper functions that provide the ability to set a
 simple fixed timeout, or to set a timeout based on the state of a round-
 trip estimator.

 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/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 5bb6fed3df34..79433ffd1df0 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1047,6 +1047,7 @@ static struct rpc_xprt_ops xs_udp_ops = {
         .set_buffer_size        = xs_udp_set_buffer_size,
         .connect                = xs_connect,
         .send_request           = xs_udp_send_request,
+        .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
         .close                  = xs_close,
         .destroy                = xs_destroy,
 };
@@ -1055,6 +1056,7 @@ static struct rpc_xprt_ops xs_tcp_ops = {
         .set_buffer_size        = xs_tcp_set_buffer_size,
         .connect                = xs_connect,
         .send_request           = xs_tcp_send_request,
+        .set_retrans_timeout    = xprt_set_retrans_timeout_def,
         .close                  = xs_close,
         .destroy                = xs_destroy,
 };