t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
t0->entry_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
t0->fib_index = vec_elt (im->mfib_index_by_sw_if_index,
t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
t0->entry_index = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
t0->fib_index = vec_elt (im->mfib_index_by_sw_if_index,