+ virtio_tx_trace_t *t;
+
+ vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[0]);
+ if (b0->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ t = vlib_add_trace (vm, node, b0, sizeof (t[0]));
+ t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+ t->buffer_index = buffers[0];
+ if (type == VIRTIO_IF_TYPE_TUN)
+ {
+ int is_ip4 = 0, is_ip6 = 0;
+
+ switch (((u8 *) vlib_buffer_get_current (b0))[0] & 0xf0)
+ {
+ case 0x40:
+ is_ip4 = 1;
+ break;
+ case 0x60:
+ is_ip6 = 1;
+ break;
+ default:
+ break;
+ }
+ vnet_generic_header_offset_parser (b0, &t->gho, 0, is_ip4,
+ is_ip6);
+ }
+ else
+ vnet_generic_header_offset_parser (b0, &t->gho, 1,
+ b0->flags &
+ VNET_BUFFER_F_IS_IP4,
+ b0->flags &
+ VNET_BUFFER_F_IS_IP6);
+
+ clib_memcpy_fast (&t->buffer, b0,
+ sizeof (*b0) - sizeof (b0->pre_data));
+ clib_memcpy_fast (t->buffer.pre_data, vlib_buffer_get_current (b0),
+ sizeof (t->buffer.pre_data));
+ }