+ if (n_copy == 0)
+ return n_left;
+ }
+ else
+ {
+ /*
+ * no work required, just copy all buffer indices from -> to
+ */
+ n_copy = n_left;
+ vlib_buffer_copy_indices (to, from, n_copy);
+ }
+
+ if (to != tmp)
+ {
+ /* indices already written to frame, just close it */
+ vlib_put_next_frame (vm, node, next_index, n_free - n_copy);
+ }
+ else if (n_free >= n_copy)
+ {
+ /* enough space in the existing frame */
+ to = (u32 *) vlib_frame_vector_args (f) + f->n_vectors;
+ vlib_buffer_copy_indices (to, tmp, n_copy);
+ vlib_put_next_frame (vm, node, next_index, n_free - n_copy);
+ }
+ else
+ {
+ /* full frame */
+ to = (u32 *) vlib_frame_vector_args (f) + f->n_vectors;
+ vlib_buffer_copy_indices (to, tmp, n_free);
+ vlib_put_next_frame (vm, node, next_index, 0);
+
+ /* second frame */
+ u32 n_2nd_frame = n_copy - n_free;
+ f = vlib_get_next_frame_internal (vm, node, next_index, 1);
+ tf = vlib_frame_scalar_args (f);
+ /* empty frame - store scalar data */
+ store_tx_frame_scalar_data (copy_frame, tf);
+ to = vlib_frame_vector_args (f);
+ vlib_buffer_copy_indices (to, tmp + n_free, n_2nd_frame);
+ vlib_put_next_frame (vm, node, next_index,
+ VLIB_FRAME_SIZE - n_2nd_frame);
+ }
+
+ return n_left - n_copy;
+}
+
+static_always_inline void
+enqueue_to_tx_node (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vnet_hw_interface_t *hi, u32 next_index,
+ vnet_hw_if_output_node_runtime_t *r, u32 *from, void **p,
+ u32 n_vectors)
+{
+ u32 n_left = n_vectors;
+
+ ASSERT (n_vectors <= VLIB_FRAME_SIZE);
+
+ /*
+ * backward compatible for drivers not integrated with new tx infra.
+ */
+ if (r == 0)
+ {
+ n_left = enqueue_one_to_tx_node (vm, node, NULL, from, NULL, n_vectors,
+ n_left, next_index);
+ }
+ /*
+ * only 1 tx queue of given interface is available on given thread
+ */
+ else if (r->n_queues == 1)
+ {
+ n_left = enqueue_one_to_tx_node (vm, node, NULL, from, r->frame,
+ n_vectors, n_left, next_index);
+ }
+ /*
+ * multi tx-queues use case
+ */
+ else if (r->n_queues > 1)
+ {
+ u32 qids[VLIB_FRAME_SIZE];
+
+ hash_func_with_mask (p, qids, n_vectors, r->lookup_table,
+ vec_len (r->lookup_table) - 1, hi->hf);