VIRTIO_NET_RSS_HASH_TYPE_TCPv4
if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4);
| (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0);