openvswitch: Add support for OVS_FLOW_ATTR_PROBE.

This new flag is useful for suppressing error logging while probing
for datapath features using flow commands.  For backwards
compatibility reasons the commands are executed normally, but error
logging is suppressed.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 8389c1d..3ece945 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -199,9 +199,9 @@
 int action_fifos_init(void);
 void action_fifos_exit(void);
 
-#define OVS_NLERR(fmt, ...)					\
+#define OVS_NLERR(logging_allowed, fmt, ...)			\
 do {								\
-	if (net_ratelimit())					\
-		pr_info("netlink: " fmt, ##__VA_ARGS__);	\
+	if (logging_allowed && net_ratelimit())			\
+		pr_info("netlink: " fmt "\n", ##__VA_ARGS__);	\
 } while (0)
 #endif /* datapath.h */