[ovs-dev] [RFC PATCH 02/14] Add NSH fields for Openvswitch flow key

[Johnson Li]

Openvswitch could use the fields of Network Serivce Header(NSH)
as key to steer traffic to the Virtual Network Functions(VNF).

Signed-off-by: Johnson Li <johnson.li at intel.com>

diff --git a/datapath/flow.c b/datapath/flow.c
index c97c9c9..fd09cec 100644
--- a/datapath/flow.c
+++ b/datapath/flow.c
@@ -489,6 +489,9 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 	skb_reset_mac_len(skb);
 	__skb_push(skb, skb->data - skb_mac_header(skb));
 
+	/* Network Service Header */
+	memset(&key->nsh, 0, sizeof(key->nsh));
+
 	/* Network layer. */
 	if (key->eth.type == htons(ETH_P_IP)) {
 		struct iphdr *nh;
diff --git a/datapath/flow.h b/datapath/flow.h
index c0b628a..2f53bfe 100644
--- a/datapath/flow.h
+++ b/datapath/flow.h
@@ -54,10 +54,25 @@ struct ovs_tunnel_info {
 	(offsetof(struct sw_flow_key, recirc_id) +	\
 	FIELD_SIZEOF(struct sw_flow_key, recirc_id))
 
+/* Network Service Header, MD Type I only for the moment.
+ */
+struct ovs_nsh_key {
+	u8  flags;
+	u8  md_type;    /* NSH metadata type */
+	u8  next_proto; /* NSH next protocol */
+	u8  nsi;        /* NSH index */
+	u32 nsp;        /* NSH path id */
+	u32 nshc1;      /* NSH context C1-C4 */
+	u32 nshc2;
+	u32 nshc3;
+	u32 nshc4;
+} __packed __aligned(4); /* Minimize padding. */
+
 struct sw_flow_key {
 	u8 tun_opts[255];
 	u8 tun_opts_len;
 	struct ip_tunnel_key tun_key;  /* Encapsulating tunnel key. */
+	struct ovs_nsh_key nsh;         /* network service header */
 	struct {
 		u32	priority;	/* Packet QoS priority. */
 		u32	skb_mark;	/* SKB mark. */
-- 
1.8.4.2