+static_always_inline void
+fill_gso_buffer_flags (vlib_buffer_t *b, u32 gso_size, u8 l4_hdr_sz)
+{
+ b->flags |= VNET_BUFFER_F_GSO;
+ vnet_buffer2 (b)->gso_size = gso_size;
+ vnet_buffer2 (b)->gso_l4_hdr_sz = l4_hdr_sz;
+}
+
+static_always_inline void
+mark_tcp_udp_cksum_calc (vlib_buffer_t *b, u8 *l4_hdr_sz)
+{
+ ethernet_header_t *eth = vlib_buffer_get_current (b);
+ vnet_buffer_oflags_t oflags = 0;
+ if (clib_net_to_host_u16 (eth->type) == ETHERNET_TYPE_IP4)
+ {
+ ip4_header_t *ip4 =
+ (vlib_buffer_get_current (b) + sizeof (ethernet_header_t));
+ b->flags |= VNET_BUFFER_F_IS_IP4;
+ if (ip4->protocol == IP_PROTOCOL_TCP)
+ {
+ oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
+ tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) +
+ ip4_header_bytes (ip4));
+ tcp->checksum = 0;
+ *l4_hdr_sz = tcp_header_bytes (tcp);
+ }
+ else if (ip4->protocol == IP_PROTOCOL_UDP)
+ {
+ oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
+ udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) +
+ ip4_header_bytes (ip4));
+ udp->checksum = 0;
+ *l4_hdr_sz = sizeof (*udp);
+ }
+ vnet_buffer (b)->l3_hdr_offset = sizeof (ethernet_header_t);
+ vnet_buffer (b)->l4_hdr_offset =
+ sizeof (ethernet_header_t) + ip4_header_bytes (ip4);
+ if (oflags)
+ vnet_buffer_offload_flags_set (b, oflags);
+ }
+ else if (clib_net_to_host_u16 (eth->type) == ETHERNET_TYPE_IP6)
+ {
+ ip6_header_t *ip6 =
+ (vlib_buffer_get_current (b) + sizeof (ethernet_header_t));
+ b->flags |= VNET_BUFFER_F_IS_IP6;
+ u16 ip6_hdr_len = sizeof (ip6_header_t);
+ if (ip6_ext_hdr (ip6->protocol))
+ {
+ ip6_ext_header_t *p = (void *) (ip6 + 1);
+ ip6_hdr_len += ip6_ext_header_len (p);
+ while (ip6_ext_hdr (p->next_hdr))
+ {
+ ip6_hdr_len += ip6_ext_header_len (p);
+ p = ip6_ext_next_header (p);
+ }
+ }
+ if (ip6->protocol == IP_PROTOCOL_TCP)
+ {
+ oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) + ip6_hdr_len);
+ tcp->checksum = 0;
+ *l4_hdr_sz = tcp_header_bytes (tcp);
+ }
+ else if (ip6->protocol == IP_PROTOCOL_UDP)
+ {
+ oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
+ udp_header_t *udp =
+ (udp_header_t *) (vlib_buffer_get_current (b) +
+ sizeof (ethernet_header_t) + ip6_hdr_len);
+ udp->checksum = 0;
+ *l4_hdr_sz = sizeof (*udp);
+ }
+ vnet_buffer (b)->l3_hdr_offset = sizeof (ethernet_header_t);
+ vnet_buffer (b)->l4_hdr_offset =
+ sizeof (ethernet_header_t) + ip6_hdr_len;
+ if (oflags)
+ vnet_buffer_offload_flags_set (b, oflags);
+ }
+}
+