netdev - [PATCH RFC v4 1/9] skbuff: Introduce SKB_EXT_TUN_VNET

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Message-Id: <20240924-rss-v4-1-84e932ec0e6c@daynix.com>
Date: Tue, 24 Sep 2024 11:01:06 +0200
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>, 
 Stephen Hemminger <stephen@...workplumber.org>, gur.stavi@...wei.com, 
 Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH RFC v4 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/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