[PATCH RFC v3 8/8] vhost/net: enable gso over UDP tunnel support.
From: Paolo Abeni <pabeni@redhat.com>
Date: 2025-06-06 11:47:05
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> --- drivers/vhost/net.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 0291fce24bbf..53491c67e89c 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c@@ -77,7 +77,9 @@ enum { (1ULL << VIRTIO_F_RING_RESET) }; -const u64 VHOST_NET_ALL_FEATURES[VIRTIO_FEATURES_DWORDS] = { VHOST_NET_FEATURES }; +const u64 VHOST_NET_ALL_FEATURES[VIRTIO_FEATURES_DWORDS] = { VHOST_NET_FEATURES, + VIRTIO_BIT(VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO) | + VIRTIO_BIT(VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO) }; enum { VHOST_NET_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)
@@ -1626,6 +1628,12 @@ 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_tunnel); + if (virtio_features_test_bit(features, VHOST_NET_F_VIRTIO_NET_HDR)) { /* vhost provides vnet_hdr */ vhost_hlen = hdr_len;
--
2.49.0