[PATCH net-next V13 0/3] openvswitch: Add support for 802.1ad

V13: Fix incorrect encoding and decoding of netlink to/from key
attributes.

V12: Fix some problems and issues pointed out by reviewers. When parsing
netlink attributes Ether types other then 0x88a8 as outer tpid.

V11: Add inner tpid to flow key. Fix separate inner encap attribute
when parsing netlink attributes. Merge 2 patches to consolidate
qinq changes.

V10: Implement reviewer comments: Consolidate vlan parsing functions.
Splits netlink parsing and flow conversion into a separate patch. Uses
double encap attribute encapsulation for 802.1ad.  Netlink attributes
now look like this:

    eth_type(0x88a8),vlan(vid=100),encap(eth_type(0x8100), vlan(vid=200),
             encap(eth_type(0x0800), ...))

The double encap atributes in this version of the patch is incompatible with
old versions of the user level 802.1ad patch. A new user level patch which
is also being submitted simultaneously to openvswitch dev mailing list.

V9:  Includes changes suggested by reviewers

V8:  Includes changes suggested by reviewers

V7:  Includes changes suggested by reviewers

V6:  Rebased to net-next

V5:  Use encapsulated attributes

Although the Open Flow specification specified support for 802.1AD (qinq)
as well as push and pop vlan headers,  So far Open vSwitch has only
supported a single tag header.

This patch accompanies version 10 of the user level openvswitch patch
submitted to openvswitch dev list.
For discussion, history  and previous versions of the kernel module
patch and the user code patch see the OVS dev mailing list,

22 more lines

Signed-off-by: Thomas F Herbert <redacted>
---
 include/linux/if_vlan.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 67ce5bd..88d1be4 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h

@@ -627,6 +627,23 @@ static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
 
 	return features;
 }
+/**
+ * eth_type_vlan - check for valid vlan ether type.
+ * @ethertype: ether type to check
+ *
+ * Returns true if the ether type is a vlan ether type.
+ */
+static inline bool eth_type_vlan(__be16 ethertype)
+{
+	switch (ethertype) {
+	case (htons(ETH_P_8021Q)):
+		return true;
+	case (htons(ETH_P_8021AD)):
+		return true;
+	default:
+		return false;
+	}
+}
 
 /**
  * compare_vlan_header - Compare two vlan headers

-- 
2.4.3