[PATCH v4 net-next 8/8] vhost/net: enable gso over UDP tunnel support.
From: Paolo Abeni <pabeni@redhat.com>
Date: 2025-06-17 16:13:30
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
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@redhat.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