This new extension will be used by tun to carry the hash values and
types to report with virtio-net headers.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
 include/linux/skbuff.h | 3 +++
 net/core/skbuff.c      | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 29c3ea5b6e93..a361c4150144 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -4718,6 +4718,9 @@ enum skb_ext_id {
 #endif
 #if IS_ENABLED(CONFIG_MCTP_FLOWS)
 	SKB_EXT_MCTP,
+#endif
+#if IS_ENABLED(CONFIG_TUN)
+	SKB_EXT_TUN_VNET_HASH,
 #endif
 	SKB_EXT_NUM, /* must be last */
 };
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 83f8cd8aa2d1..f0bf94cf458b 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -64,6 +64,7 @@
 #include <linux/mpls.h>
 #include <linux/kcov.h>
 #include <linux/iov_iter.h>
+#include <linux/virtio_net.h>
 
 #include <net/protocol.h>
 #include <net/dst.h>
@@ -4979,6 +4980,9 @@ static const u8 skb_ext_type_len[] = {
 #if IS_ENABLED(CONFIG_MCTP_FLOWS)
 	[SKB_EXT_MCTP] = SKB_EXT_CHUNKSIZEOF(struct mctp_flow),
 #endif
+#if IS_ENABLED(CONFIG_TUN)
+	[SKB_EXT_TUN_VNET_HASH] = SKB_EXT_CHUNKSIZEOF(struct virtio_net_hash),
+#endif
 };
 
 static __always_inline unsigned int skb_ext_total_length(void)

-- 
2.46.2