linux-kernel - [RFC PATCH v2 3/7] skbuff: Introduce SKB_EXT_TUN_VNET

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Message-ID: <20231015141644.260646-4-akihiko.odaki@daynix.com>
Date:   Sun, 15 Oct 2023 23:16:31 +0900
From:   Akihiko Odaki <akihiko.odaki@...nix.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        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>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        bpf@...r.kernel.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: [RFC PATCH v2 3/7] 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 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)
-- 
2.42.0