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

Akihiko Odaki
2024-09-24T09:01:18Z

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/if_tun.h | 5 +++++
include/linux/skbuff.h | 3 +++
net/core/skbuff.c | 4 ++++
3 files changed, 12 insertions(+)

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)

--
2.46.0