+static_always_inline void
+vhost_user_handle_rx_offload (vlib_buffer_t * b0, u8 * b0_data,
+ virtio_net_hdr_t * hdr)
+{
+ u8 l4_hdr_sz = 0;
+
+ if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
+ {
+ u8 l4_proto = 0;
+ ethernet_header_t *eh = (ethernet_header_t *) b0_data;
+ u16 ethertype = clib_net_to_host_u16 (eh->type);
+ u16 l2hdr_sz = sizeof (ethernet_header_t);
+
+ if (ethernet_frame_is_tagged (ethertype))
+ {
+ ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
+
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ if (ethertype == ETHERNET_TYPE_VLAN)
+ {
+ vlan++;
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ }
+ }
+ vnet_buffer (b0)->l2_hdr_offset = 0;
+ vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
+ vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start;
+ b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L4_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_OFFLOAD_IP_CKSUM);
+
+ if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
+ {
+ ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz);
+ l4_proto = ip4->protocol;
+ b0->flags |= VNET_BUFFER_F_IS_IP4;
+ }
+ else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
+ {
+ ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz);
+ l4_proto = ip6->protocol;
+ b0->flags |= VNET_BUFFER_F_IS_IP6;
+ }
+
+ if (l4_proto == IP_PROTOCOL_TCP)
+ {
+ tcp_header_t *tcp = (tcp_header_t *)
+ (b0_data + vnet_buffer (b0)->l4_hdr_offset);
+ l4_hdr_sz = tcp_header_bytes (tcp);
+ tcp->checksum = 0;
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ }
+ else if (l4_proto == IP_PROTOCOL_UDP)
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (b0_data + vnet_buffer (b0)->l4_hdr_offset);
+ l4_hdr_sz = sizeof (*udp);
+ udp->checksum = 0;
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+ }
+ }
+
+ if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP)
+ {
+ vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+ b0->flags |= VNET_BUFFER_F_GSO;
+ }
+ else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
+ {
+ vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+ b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4);
+ }
+ else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
+ {
+ vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+ b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6);
+ }
+}
+