- b0->flags |= (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | VNET_BUFFER_F_GSO);
- tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) +
- vnet_buffer
- (b0)->l4_hdr_offset);
- l4_hdr_sz = tcp_header_bytes (tcp);
- tcp->checksum = 0;
- vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
- vnet_buffer2 (b0)->gso_size = packet_data_size;
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+
+ /* only set GSO flag for chained buffers */
+ if (gso_enabled && (b0->flags & VLIB_BUFFER_NEXT_PRESENT))
+ {
+ b0->flags |= VNET_BUFFER_F_GSO;
+ tcp_header_t *tcp =
+ (tcp_header_t *) (vlib_buffer_get_current (b0) +
+ vnet_buffer (b0)->l4_hdr_offset);
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = tcp_header_bytes (tcp);
+ vnet_buffer2 (b0)->gso_size = gso_size;
+ }