linux-kernel - [PATCH RFC v3 1/9] skbuff: Introduce SKB_EXT_TUN_VNET

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Message-Id: <20240915-rss-v3-1-c630015db082@daynix.com>
Date: Sun, 15 Sep 2024 10:17:40 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: Jonathan Corbet <corbet@....net>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Jason Wang <jasowang@...hat.com>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Shuah Khan <shuah@...nel.org>, 
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
 netdev@...r.kernel.org, kvm@...r.kernel.org, 
 virtualization@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org, 
 Yuri Benditovich <yuri.benditovich@...nix.com>, 
 Andrew Melnychenko <andrew@...nix.com>, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH RFC v3 1/9] skbuff: Introduce SKB_EXT_TUN_VNET_HASH

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@...nix.com>
---
 include/linux/skbuff.h | 10 ++++++++++
 net/core/skbuff.c      |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 29c3ea5b6e93..17cee21c9999 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -334,6 +334,13 @@ struct tc_skb_ext {
 };
 #endif

+#if IS_ENABLED(CONFIG_TUN)
+struct tun_vnet_hash_ext {
+	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,
@@ -4718,6 +4725,9 @@ 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..ce34523fd8de 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4979,6 +4979,9 @@ 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