flow_dissector: Get vlan priority in addition to vlan id

Add vlan priority check to the flow dissector by adding new flow
dissector struct, flow_dissector_key_vlan which includes vlan tag
fields.

vlan_id and flow_label fields were under the same struct
(flow_dissector_key_tags). It was a convenient setting since struct
flow_dissector_key_tags is used by struct flow_keys and by setting
vlan_id and flow_label under the same struct, we get precisely 24 or 48
bytes in flow_keys from flow_dissector_key_basic.

Now, when adding vlan priority support, the code will be cleaner if
flow_label and vlan tag won't be under the same struct anymore.

Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 3 deletions

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index d3d60dccd19f..f266b512c3bd 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -32,8 +32,13 @@ struct flow_dissector_key_basic {
 };
 
 struct flow_dissector_key_tags {
-	u32	vlan_id:12,
-		flow_label:20;
+	u32	flow_label;
+};
+
+struct flow_dissector_key_vlan {
+	u16	vlan_id:12,
+		vlan_priority:3;
+	u16	padding;
 };
 
 struct flow_dissector_key_keyid {
@@ -119,7 +124,7 @@ enum flow_dissector_key_id {
 	FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
 	FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
 	FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
-	FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
+	FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */
 	FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
 	FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
 	FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
@@ -148,6 +153,7 @@ struct flow_keys {
 #define FLOW_KEYS_HASH_START_FIELD basic
 	struct flow_dissector_key_basic basic;
 	struct flow_dissector_key_tags tags;
+	struct flow_dissector_key_vlan vlan;
 	struct flow_dissector_key_keyid keyid;
 	struct flow_dissector_key_ports ports;
 	struct flow_dissector_key_addrs addrs;