[PATCH v2 net-next 1/5] net/flow_dissector: Save vlan ethertype from headers

[Jianbo Liu]

Change vlan dissector key to save vlan tpid to support both 802.1Q
and 802.1AD ethertype.

Signed-off-by: Jianbo Liu <jian...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
---
 include/net/flow_dissector.h | 2 +-
 net/core/flow_dissector.c    | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index adc24df5..8f89968 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -47,7 +47,7 @@ struct flow_dissector_key_tags {
 struct flow_dissector_key_vlan {
        u16     vlan_id:12,
                vlan_priority:3;
-       u16     padding;
+       __be16  vlan_tpid;
 };
 
 struct flow_dissector_key_mpls {
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 53f96e4..18cb99b 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -751,6 +751,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
                const struct vlan_hdr *vlan;
                struct vlan_hdr _vlan;
                bool vlan_tag_present = skb && skb_vlan_tag_present(skb);
+               __be16 saved_vlan_tpid = proto;
 
                if (vlan_tag_present)
                        proto = skb->protocol;
@@ -789,6 +790,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
                                        (ntohs(vlan->h_vlan_TCI) &
                                         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
                        }
+                       key_vlan->vlan_tpid = saved_vlan_tpid;
                }
 
                fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
-- 
2.9.5