netdev - [PATCH v4 net-next 8/8] vhost/net: enable gso over UDP tunnel support.

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Message-ID: <1e9154a001fda22f358ebc0cbf4edaf9e05d9417.1750176076.git.pabeni@redhat.com>
Date: Tue, 17 Jun 2025 18:12:15 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Jason Wang <jasowang@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Yuri Benditovich <yuri.benditovich@...nix.com>,
	Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH v4 net-next 8/8] vhost/net: enable gso over UDP tunnel support.

Vhost net need to know the exact virtio net hdr size to be able
to copy such header correctly. Teach it about the newly defined
UDP tunnel-related option and update the hdr size computation
accordingly.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
v3 -> v4:
  - rebased
---
 drivers/vhost/net.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 126aa4ee26a8..c36ff30bf14f 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -75,6 +75,8 @@ static const u64 vhost_net_features[VIRTIO_FEATURES_DWORDS] = {
 	(1ULL << VIRTIO_NET_F_MRG_RXBUF) |
 	(1ULL << VIRTIO_F_ACCESS_PLATFORM) |
 	(1ULL << VIRTIO_F_RING_RESET),
+	VIRTIO_BIT(VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO) |
+	VIRTIO_BIT(VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO),
 };
 
 enum {
@@ -1624,6 +1626,12 @@ static int vhost_net_set_features(struct vhost_net *n, const u64 *features)
 		  sizeof(struct virtio_net_hdr_mrg_rxbuf) :
 		  sizeof(struct virtio_net_hdr);
 
+	if (virtio_features_test_bit(features,
+				     VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO) ||
+	    virtio_features_test_bit(features,
+				     VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO))
+		hdr_len = sizeof(struct virtio_net_hdr_v1_hash_tunnel);
+
 	if (virtio_features_test_bit(features, VHOST_NET_F_VIRTIO_NET_HDR)) {
 		/* vhost provides vnet_hdr */
 		vhost_hlen = hdr_len;
-- 
2.49.0