netdev - [PATCH v5 net-next 9/9] vhost/net: enable gso over UDP tunnel support.

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Message-ID: <f0f6ebd89251d343e5fe0f1884c3207115ba9a2d.1750436464.git.pabeni@redhat.com>
Date: Fri, 20 Jun 2025 19:39:53 +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>,
	Jonathan Corbet <corbet@....net>,
	kvm@...r.kernel.org
Subject: [PATCH v5 net-next 9/9] 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.

Acked-by: Jason Wang <jasowang@...hat.com>
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 b7dd50aa1ba3..3d99da3381ce 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