net: flow_offload: add support for ARP frame matching

This adds a new flow_rule_match_arp function that allows drivers
to be able to dissect ARP frames.
Signed-off-by: NSteen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/flow_offload.h

@@ -32,6 +32,10 @@ struct flow_match_vlan {
 	struct flow_dissector_key_vlan *key, *mask;
 };
 
+struct flow_match_arp {
+	struct flow_dissector_key_arp *key, *mask;
+};
+
 struct flow_match_ipv4_addrs {
 	struct flow_dissector_key_ipv4_addrs *key, *mask;
 };
@@ -98,6 +102,8 @@ void flow_rule_match_vlan(const struct flow_rule *rule,
 			  struct flow_match_vlan *out);
 void flow_rule_match_cvlan(const struct flow_rule *rule,
 			   struct flow_match_vlan *out);
+void flow_rule_match_arp(const struct flow_rule *rule,
+			 struct flow_match_arp *out);
 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
 				struct flow_match_ipv4_addrs *out);
 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,

net/core/flow_offload.c

@@ -97,6 +97,13 @@ void flow_rule_match_cvlan(const struct flow_rule *rule,
 }
 EXPORT_SYMBOL(flow_rule_match_cvlan);
 
+void flow_rule_match_arp(const struct flow_rule *rule,
+			 struct flow_match_arp *out)
+{
+	FLOW_DISSECTOR_MATCH(rule, FLOW_DISSECTOR_KEY_ARP, out);
+}
+EXPORT_SYMBOL(flow_rule_match_arp);
+
 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
 				struct flow_match_ipv4_addrs *out)
 {