[RFC,v4,1/9] skbuff: Introduce SKB_EXT_TUN_VNET_HASH

Commit Message

Akihiko Odaki Sept. 24, 2024, 9:01 a.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/if_tun.h | 5 +++++
 include/linux/skbuff.h | 3 +++
 net/core/skbuff.c      | 4 ++++
 3 files changed, 12 insertions(+)

Patch

diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
index 043d442994b0..47034aede329 100644
--- a/include/linux/if_tun.h
+++ b/include/linux/if_tun.h
@@ -9,6 +9,11 @@ 
 #include <uapi/linux/if_tun.h>
 #include <uapi/linux/virtio_net.h>
 
+struct tun_vnet_hash_ext {
+	u32 value;
+	u16 report;
+};
+
 #define TUN_XDP_FLAG 0x1UL
 
 #define TUN_MSG_UBUF 1
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..997d79d5612c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -60,6 +60,7 @@ 
 #include <linux/errqueue.h>
 #include <linux/prefetch.h>
 #include <linux/bitfield.h>
+#include <linux/if_tun.h>
 #include <linux/if_vlan.h>
 #include <linux/mpls.h>
 #include <linux/kcov.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 tun_vnet_hash_ext),
+#endif
 };
 
 static __always_inline unsigned int skb_ext_total_length(void)