[PATCH] Fix typo in net/sunrpc/xprt.c

The appended patch fixes a typo in net/sunrpc/xprt.c: We want to
ensure that we play safe, and only increment the UDP congestion window
when we have successfully transmitted a full frame of data.

In addition, we should perhaps still 'slow start' the UDP congestion
code rather than assuming that we can immediately fire off 8
requests. IOW revert the value of RPC_INITCWND.

include/linux/sunrpc/xprt.h

@@ -37,7 +37,7 @@
 #define RPC_MAXREQS		RPC_MAXCONG
 #define RPC_CWNDSCALE		(256)
 #define RPC_MAXCWND		(RPC_MAXCONG * RPC_CWNDSCALE)
-#define RPC_INITCWND		(RPC_MAXCWND >> 1)
+#define RPC_INITCWND		RPC_CWNDSCALE
 #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
 
 /* Default timeout values */

net/sunrpc/xprt.c

@@ -309,7 +309,7 @@ xprt_adjust_cwnd(struct rpc_xprt *xprt, int result)
 	unsigned long	cwnd;
 
 	cwnd = xprt->cwnd;
-	if (result >= 0 && xprt->cong <= cwnd) {
+	if (result >= 0 && cwnd <= xprt->cong) {
 		/* The (cwnd >> 1) term makes sure
 		 * the result gets rounded properly. */
 		cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd;