[RFC,v2,3/7] skbuff: Introduce SKB_EXT_TUN_VNET_HASH

Commit Message

Akihiko Odaki Oct. 15, 2023, 2:16 p.m. UTC

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 <[e-mail]>
---
 include/linux/skbuff.h | 10 ++++++++++
 net/core/skbuff.c      |  3 +++
 2 files changed, 13 insertions(+)

Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4174c4b82d13..1f2e5d350810 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -333,6 +333,13 @@  struct tc_skb_ext {
 };
 #endif
 
+#if IS_ENABLED(CONFIG_TUN)
+struct tun_vnet_hash {
+	u32 value;
+	u16 report;
+};
+#endif
+
 struct sk_buff_head {
 	/* These two members must be first to match sk_buff. */
 	struct_group_tagged(sk_buff_list, list,
@@ -4631,6 +4638,9 @@  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 4eaf7ed0d1f4..774c2b26bf25 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4793,6 +4793,9 @@  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 tun_vnet_hash),
+#endif
 };
 
 static __always_inline unsigned int skb_ext_total_length(void)