linux-kernel - [RFC PATCH v2 4/7] virtio_net: Add virtio_net_hdr_v1_hash_from

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Date:   Sun, 15 Oct 2023 23:16:32 +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 4/7] virtio_net: Add virtio_net_hdr_v1_hash_from_skb()

It is identical with virtio_net_hdr_from_skb() except that it
impelements hash reporting.

Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
 include/linux/virtio_net.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
index 7b4dd69555e4..01e594b4586b 100644
--- a/include/linux/virtio_net.h
+++ b/include/linux/virtio_net.h
@@ -216,4 +216,26 @@ static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
 	return 0;
 }
 
+static inline int virtio_net_hdr_v1_hash_from_skb(const struct sk_buff *skb,
+						  struct virtio_net_hdr_v1_hash *hdr,
+						  bool little_endian,
+						  bool has_data_valid,
+						  int vlan_hlen,
+						  u32 hash_value,
+						  u16 hash_report)
+{
+	int ret;
+
+	memset(hdr, 0, sizeof(*hdr));
+
+	ret = virtio_net_hdr_from_skb(skb, (struct virtio_net_hdr *)hdr,
+				      little_endian, has_data_valid, vlan_hlen);
+	if (!ret) {
+		hdr->hash_value = cpu_to_le32(hash_value);
+		hdr->hash_report = cpu_to_le16(hash_report);
+	}
+
+	return ret;
+}
+
 #endif /* _LINUX_VIRTIO_NET_H */
-- 
2.42.0