openvswitch: Add support for Geneve tunneling.

The Openvswitch implementation is completely agnostic to the options
that are in use and can handle newly defined options without
further work. It does this by simply matching on a byte array
of options and allowing userspace to setup flows on this array.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Singed-off-by: Ansis Atteka <aatteka@nicira.com>
Signed-off-by: Andy Zhou <azhou@nicira.com>
Acked-by: Thomas Graf <tgraf@noironetworks.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 1 deletions

diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index fe5a71b81c1f..71813318c8c7 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -51,11 +51,24 @@ struct ovs_key_ipv4_tunnel {
 
 struct ovs_tunnel_info {
         struct ovs_key_ipv4_tunnel tunnel;
+        struct geneve_opt *options;
+        u8 options_len;
 };
 
+/* Store options at the end of the array if they are less than the
+ * maximum size. This allows us to get the benefits of variable length
+ * matching for small options.
+ */
+#define GENEVE_OPTS(flow_key, opt_len)  \
+        ((struct geneve_opt *)((flow_key)->tun_opts + \
+                               FIELD_SIZEOF(struct sw_flow_key, tun_opts) - \
+                               opt_len))
+
 static inline void ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info,
                                           const struct iphdr *iph,
-                                          __be64 tun_id, __be16 tun_flags)
+                                          __be64 tun_id, __be16 tun_flags,
+                                          struct geneve_opt *opts,
+                                          u8 opts_len)
 {
         tun_info->tunnel.tun_id = tun_id;
         tun_info->tunnel.ipv4_src = iph->saddr;
@@ -67,9 +80,14 @@ static inline void ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info,
         /* clear struct padding. */
         memset((unsigned char *)&tun_info->tunnel + OVS_TUNNEL_KEY_SIZE, 0,
                sizeof(tun_info->tunnel) - OVS_TUNNEL_KEY_SIZE);
+
+        tun_info->options = opts;
+        tun_info->options_len = opts_len;
 }
 
 struct sw_flow_key {
+        u8 tun_opts[255];
+        u8 tun_opts_len;
         struct ovs_key_ipv4_tunnel tun_key;  /* Encapsulating tunnel key. */
         struct {
                 u32     priority;       /* Packet QoS priority. */