+static_always_inline void
+fill_gso_offload (vlib_buffer_t *b0, vnet_virtio_net_hdr_t *vnet_hdr)
+{
+ vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags;
+ if (b0->flags & VNET_BUFFER_F_IS_IP4)
+ {
+ ip4_header_t *ip4;
+ vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ vnet_hdr->gso_size = vnet_buffer2 (b0)->gso_size;
+ vnet_hdr->hdr_len =
+ vnet_buffer (b0)->l4_hdr_offset + vnet_buffer2 (b0)->gso_l4_hdr_sz;
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = vnet_buffer (b0)->l4_hdr_offset; // 0x22;
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ ip4 = (ip4_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l3_hdr_offset);
+ if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
+ ip4->checksum = ip4_header_checksum (ip4);
+ }
+ else if (b0->flags & VNET_BUFFER_F_IS_IP6)
+ {
+ vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ vnet_hdr->gso_size = vnet_buffer2 (b0)->gso_size;
+ vnet_hdr->hdr_len =
+ vnet_buffer (b0)->l4_hdr_offset + vnet_buffer2 (b0)->gso_l4_hdr_sz;
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = vnet_buffer (b0)->l4_hdr_offset; // 0x36;
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
+}
+
+static_always_inline void
+fill_cksum_offload (vlib_buffer_t *b0, vnet_virtio_net_hdr_t *vnet_hdr)
+{
+ vnet_buffer_oflags_t oflags = vnet_buffer (b0)->oflags;
+ if (b0->flags & VNET_BUFFER_F_IS_IP4)
+ {
+ ip4_header_t *ip4;
+ ip4 = (ip4_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l3_hdr_offset);
+ if (oflags & VNET_BUFFER_OFFLOAD_F_IP_CKSUM)
+ ip4->checksum = ip4_header_checksum (ip4);
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = 0x22;
+ if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
+ {
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ tcp->checksum = ip4_pseudo_header_cksum (ip4);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
+ else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ udp->checksum = ip4_pseudo_header_cksum (ip4);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ }
+ }
+ else if (b0->flags & VNET_BUFFER_F_IS_IP6)
+ {
+ ip6_header_t *ip6;
+ vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ vnet_hdr->csum_start = 0x36;
+ ip6 = (ip6_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l3_hdr_offset);
+ if (oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM)
+ {
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ tcp->checksum = ip6_pseudo_header_cksum (ip6);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (tcp_header_t, checksum);
+ }
+ else if (oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)
+ {
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ udp->checksum = ip6_pseudo_header_cksum (ip6);
+ vnet_hdr->csum_offset = STRUCT_OFFSET_OF (udp_header_t, checksum);
+ }
+ }
+}
+