[PATCH net-next 5/6] flow_offload: add flow_rule_match_no_control_flags()

["Asbjørn Sloth Tønnesen" <ast@fiberby.net>]

This helper can by used by drivers, that doesn't look
into FLOW_DISSECTOR_KEY_CONTROL at all.

This is aimed at drivers, which doesn't call flow_rule_match_control()
directly, and therefore doesn't support any control flags.

Only compile-tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
 include/net/flow_offload.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index 415d225204a1f..b427b93d151a9 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -484,6 +484,26 @@ static inline bool flow_rule_no_control_flags(const u32 flags,
 	return flow_rule_no_unsupp_control_flags(0, flags, extack);
 }
 
+/**
+ * flow_rule_match_no_control_flags() - match and check for any control flags
+ * @rule: The flow_rule under evaluation.
+ * @extack: The netlink extended ACK for reporting errors.
+ *
+ * Returns true if no control flags are set, false otherwise.
+ */
+static inline bool flow_rule_match_no_control_flags(struct flow_rule *rule,
+						    struct netlink_ext_ack *extack)
+{
+	struct flow_match_control match;
+
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL))
+		return true;
+
+	flow_rule_match_control(rule, &match);
+
+	return flow_rule_no_control_flags(match.mask->flags, extack);
+}
+
 struct flow_stats {
 	u64	pkts;
 	u64	bytes;
-- 
2.43.0