+static_always_inline uword
+memif_device_input_zc_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, memif_if_t * mif,
+ u16 qid, memif_interface_mode_t mode)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ memif_main_t *mm = &memif_main;
+ memif_ring_t *ring;
+ memif_queue_t *mq;
+ u32 next_index;
+ uword n_trace = vlib_get_trace_count (vm, node);
+ u32 n_rx_packets = 0, n_rx_bytes = 0;
+ u32 *to_next = 0, *buffers;
+ u32 bi0, bi1, bi2, bi3;
+ u16 s0, s1, s2, s3;
+ memif_desc_t *d0, *d1, *d2, *d3;
+ vlib_buffer_t *b0, *b1, *b2, *b3;
+ u32 thread_index = vm->thread_index;
+ memif_per_thread_data_t *ptd = vec_elt_at_index (mm->per_thread_data,
+ thread_index);
+ u16 cur_slot, last_slot, ring_size, n_slots, mask, head;
+ i16 start_offset;
+ u32 buffer_length;
+ u16 n_alloc, n_from;
+
+ mq = vec_elt_at_index (mif->rx_queues, qid);
+ ring = mq->ring;
+ ring_size = 1 << mq->log2_ring_size;
+ mask = ring_size - 1;
+
+ next_index = (mode == MEMIF_INTERFACE_MODE_IP) ?
+ VNET_DEVICE_INPUT_NEXT_IP6_INPUT : VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+
+ /* asume that somebody will want to add ethernet header on the packet
+ so start with IP header at offset 14 */
+ start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? 14 : 0;
+ buffer_length = VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES - start_offset;
+
+ cur_slot = mq->last_tail;
+ last_slot = ring->tail;
+ if (cur_slot == last_slot)
+ goto refill;
+ n_slots = last_slot - cur_slot;
+
+ /* process ring slots */
+ vec_validate_aligned (ptd->buffers, MEMIF_RX_VECTOR_SZ,
+ CLIB_CACHE_LINE_BYTES);
+ while (n_slots && n_rx_packets < MEMIF_RX_VECTOR_SZ)
+ {
+ vlib_buffer_t *hb;
+
+ s0 = cur_slot & mask;
+ bi0 = mq->buffers[s0];
+ ptd->buffers[n_rx_packets++] = bi0;
+
+ CLIB_PREFETCH (&ring->desc[(cur_slot + 8) & mask],
+ CLIB_CACHE_LINE_BYTES, LOAD);
+ d0 = &ring->desc[s0];
+ hb = b0 = vlib_get_buffer (vm, bi0);
+ b0->current_data = start_offset;
+ b0->current_length = start_offset + d0->length;
+ n_rx_bytes += d0->length;
+
+ if (0 && memif_desc_is_invalid (mif, d0, buffer_length))
+ return 0;
+
+ cur_slot++;
+ n_slots--;
+ if (PREDICT_FALSE ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots))
+ {
+ hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
+ next_slot:
+ s0 = cur_slot & mask;
+ d0 = &ring->desc[s0];
+ bi0 = mq->buffers[s0];
+
+ /* previous buffer */
+ b0->next_buffer = bi0;
+ b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
+
+ /* current buffer */