2 *------------------------------------------------------------------
3 * Copyright (c) 2016 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
21 #include <sys/ioctl.h>
24 #include <vlib/vlib.h>
25 #include <vlib/unix/unix.h>
26 #include <vnet/ethernet/ethernet.h>
27 #include <vnet/devices/devices.h>
28 #include <vnet/feature/feature.h>
30 #include <memif/memif.h>
31 #include <memif/private.h>
33 #define foreach_memif_input_error \
34 _(BUFFER_ALLOC_FAIL, "buffer allocation failed") \
35 _(NOT_IP, "not ip packet")
39 #define _(f,s) MEMIF_INPUT_ERROR_##f,
40 foreach_memif_input_error
43 } memif_input_error_t;
45 static __clib_unused char *memif_input_error_strings[] = {
47 foreach_memif_input_error
56 } memif_input_trace_t;
58 static __clib_unused u8 *
59 format_memif_input_trace (u8 * s, va_list * args)
61 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
62 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
63 memif_input_trace_t *t = va_arg (*args, memif_input_trace_t *);
64 u32 indent = format_get_indent (s);
66 s = format (s, "memif: hw_if_index %d next-index %d",
67 t->hw_if_index, t->next_index);
68 s = format (s, "\n%Uslot: ring %u", format_white_space, indent + 2,
73 static_always_inline u32
74 memif_next_from_ip_hdr (vlib_node_runtime_t * node, vlib_buffer_t * b)
76 u8 *ptr = vlib_buffer_get_current (b);
79 if (PREDICT_TRUE (v == 0x40))
80 return VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
81 else if (PREDICT_TRUE (v == 0x60))
82 return VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
84 b->error = node->errors[MEMIF_INPUT_ERROR_NOT_IP];
85 return VNET_DEVICE_INPUT_NEXT_DROP;
88 static_always_inline void
89 memif_trace_buffer (vlib_main_t * vm, vlib_node_runtime_t * node,
90 memif_if_t * mif, vlib_buffer_t * b, u32 next, u16 qid,
93 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
95 if (PREDICT_TRUE (b != 0))
97 memif_input_trace_t *tr;
98 vlib_trace_buffer (vm, node, next, b, /* follow_chain */ 0);
99 vlib_set_trace_count (vm, node, --(*n_tracep));
100 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
101 tr->next_index = next;
102 tr->hw_if_index = mif->hw_if_index;
107 static_always_inline void
108 memif_add_copy_op (memif_per_thread_data_t * ptd, void *data, u32 len,
109 u16 buffer_offset, u16 buffer_vec_index)
112 vec_add2_aligned (ptd->copy_ops, co, 1, CLIB_CACHE_LINE_BYTES);
115 co->buffer_offset = buffer_offset;
116 co->buffer_vec_index = buffer_vec_index;
119 static_always_inline void
120 memif_add_to_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * buffers,
123 vlib_buffer_t *seg = b;
124 i32 bytes_left = b->current_length - buffer_size + b->current_data;
126 if (PREDICT_TRUE (bytes_left <= 0))
129 b->current_length -= bytes_left;
130 b->total_length_not_including_first_buffer = bytes_left;
134 seg->flags |= VLIB_BUFFER_NEXT_PRESENT;
135 seg->next_buffer = buffers[0];
136 seg = vlib_get_buffer (vm, buffers[0]);
138 seg->current_data = 0;
139 seg->current_length = clib_min (buffer_size, bytes_left);
140 bytes_left -= seg->current_length;
144 static_always_inline u32
145 sat_sub (u32 x, u32 y)
152 /* branchless validation of the descriptor - uses saturated subtraction */
153 static_always_inline u32
154 memif_desc_is_invalid (memif_if_t * mif, memif_desc_t * d, u32 buffer_length)
157 u16 valid_flags = MEMIF_DESC_FLAG_NEXT;
159 rv = d->flags & (~valid_flags);
160 rv |= sat_sub (d->region + 1, vec_len (mif->regions));
161 rv |= sat_sub (d->length, buffer_length);
162 rv |= sat_sub (d->offset + d->length, mif->regions[d->region].region_size);
164 if (PREDICT_FALSE (rv))
166 mif->flags |= MEMIF_IF_FLAG_ERROR;
173 static_always_inline uword
174 memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
175 vlib_frame_t * frame, memif_if_t * mif,
176 memif_ring_type_t type, u16 qid,
177 memif_interface_mode_t mode)
179 vnet_main_t *vnm = vnet_get_main ();
180 memif_main_t *mm = &memif_main;
183 u16 buffer_size = VLIB_BUFFER_DATA_SIZE;
184 uword n_trace = vlib_get_trace_count (vm, node);
185 u16 nexts[MEMIF_RX_VECTOR_SZ], *next = nexts;
186 u32 _to_next_bufs[MEMIF_RX_VECTOR_SZ], *to_next_bufs = _to_next_bufs, *bi;
187 u32 n_rx_packets = 0, n_rx_bytes = 0;
188 u32 n_left, n_left_to_next, next_index;
189 vlib_buffer_t *b0, *b1, *b2, *b3;
190 u32 thread_index = vm->thread_index;
191 memif_per_thread_data_t *ptd = vec_elt_at_index (mm->per_thread_data,
194 u16 cur_slot, last_slot, ring_size, n_slots, mask;
196 u16 n_buffers = 0, n_alloc;
198 memif_packet_op_t *po;
199 memif_region_index_t last_region = ~0;
200 void *last_region_shm = 0;
202 mq = vec_elt_at_index (mif->rx_queues, qid);
204 ring_size = 1 << mq->log2_ring_size;
205 mask = ring_size - 1;
207 /* asume that somebody will want to add ethernet header on the packet
208 so start with IP header at offset 14 */
209 start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? 14 : 0;
211 /* for S2M rings, we are consumers of packet buffers, and for M2S rings we
212 are producers of empty buffers */
213 cur_slot = (type == MEMIF_RING_S2M) ? mq->last_head : mq->last_tail;
214 last_slot = (type == MEMIF_RING_S2M) ? ring->head : ring->tail;
215 if (cur_slot == last_slot)
217 n_slots = last_slot - cur_slot;
219 /* construct copy and packet vector out of ring slots */
220 while (n_slots && n_rx_packets < MEMIF_RX_VECTOR_SZ)
222 u32 dst_off, src_off, n_bytes_left;
226 po = ptd->packet_ops + n_rx_packets;
228 po->first_buffer_vec_index = n_buffers++;
231 dst_off = start_offset;
234 CLIB_PREFETCH (&ring->desc[(cur_slot + 8) & mask],
235 CLIB_CACHE_LINE_BYTES, LOAD);
236 s0 = cur_slot & mask;
237 d0 = &ring->desc[s0];
238 n_bytes_left = d0->length;
240 /* slave resets buffer length,
241 * so it can produce full size buffer for master
243 if (type == MEMIF_RING_M2S)
244 d0->length = mif->run.buffer_size;
246 po->packet_len += n_bytes_left;
247 if (PREDICT_FALSE (last_region != d0->region))
249 last_region_shm = mif->regions[d0->region].shm;
250 last_region = d0->region;
252 mb0 = last_region_shm + d0->offset;
256 u32 dst_free = buffer_size - dst_off;
260 dst_free = buffer_size;
263 u32 bytes_to_copy = clib_min (dst_free, n_bytes_left);
264 memif_add_copy_op (ptd, mb0 + src_off, bytes_to_copy, dst_off,
266 n_bytes_left -= bytes_to_copy;
267 src_off += bytes_to_copy;
268 dst_off += bytes_to_copy;
270 while (PREDICT_FALSE (n_bytes_left));
274 if ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots)
281 /* allocate free buffers */
282 vec_validate_aligned (ptd->buffers, n_buffers - 1, CLIB_CACHE_LINE_BYTES);
283 n_alloc = vlib_buffer_alloc_from_pool (vm, ptd->buffers, n_buffers,
284 mq->buffer_pool_index);
285 if (PREDICT_FALSE (n_alloc != n_buffers))
288 vlib_buffer_free (vm, ptd->buffers, n_alloc);
289 vlib_error_count (vm, node->node_index,
290 MEMIF_INPUT_ERROR_BUFFER_ALLOC_FAIL, 1);
295 n_left = vec_len (ptd->copy_ops);
299 CLIB_PREFETCH (co[4].data, CLIB_CACHE_LINE_BYTES, LOAD);
300 CLIB_PREFETCH (co[5].data, CLIB_CACHE_LINE_BYTES, LOAD);
301 CLIB_PREFETCH (co[6].data, CLIB_CACHE_LINE_BYTES, LOAD);
302 CLIB_PREFETCH (co[7].data, CLIB_CACHE_LINE_BYTES, LOAD);
304 b0 = vlib_get_buffer (vm, ptd->buffers[co[0].buffer_vec_index]);
305 b1 = vlib_get_buffer (vm, ptd->buffers[co[1].buffer_vec_index]);
306 b2 = vlib_get_buffer (vm, ptd->buffers[co[2].buffer_vec_index]);
307 b3 = vlib_get_buffer (vm, ptd->buffers[co[3].buffer_vec_index]);
309 clib_memcpy_fast (b0->data + co[0].buffer_offset, co[0].data,
311 clib_memcpy_fast (b1->data + co[1].buffer_offset, co[1].data,
313 clib_memcpy_fast (b2->data + co[2].buffer_offset, co[2].data,
315 clib_memcpy_fast (b3->data + co[3].buffer_offset, co[3].data,
323 b0 = vlib_get_buffer (vm, ptd->buffers[co[0].buffer_vec_index]);
324 clib_memcpy_fast (b0->data + co[0].buffer_offset, co[0].data,
330 /* release slots from the ring */
331 if (type == MEMIF_RING_S2M)
333 CLIB_MEMORY_STORE_BARRIER ();
334 ring->tail = mq->last_head = cur_slot;
338 mq->last_tail = cur_slot;
341 /* prepare buffer template and next indices */
342 vnet_buffer (&ptd->buffer_template)->sw_if_index[VLIB_RX] =
344 vnet_buffer (&ptd->buffer_template)->feature_arc_index = 0;
345 ptd->buffer_template.current_data = start_offset;
346 ptd->buffer_template.current_config_index = 0;
347 ptd->buffer_template.buffer_pool_index = mq->buffer_pool_index;
349 if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
351 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
352 if (mif->per_interface_next_index != ~0)
353 next_index = mif->per_interface_next_index;
355 vnet_feature_start_device_input_x1 (mif->sw_if_index, &next_index,
356 &ptd->buffer_template);
358 vlib_get_new_next_frame (vm, node, next_index, to_next_bufs,
360 if (PREDICT_TRUE (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT))
362 vlib_next_frame_t *nf;
364 ethernet_input_frame_t *ef;
365 nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
366 f = vlib_get_frame (vm, nf->frame_index);
367 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
369 ef = vlib_frame_scalar_args (f);
370 ef->sw_if_index = mif->sw_if_index;
371 ef->hw_if_index = mif->hw_if_index;
375 /* process buffer metadata */
376 u32 n_from = n_rx_packets;
377 po = ptd->packet_ops;
380 /* copy template into local variable - will save per packet load */
381 vlib_buffer_copy_template (&bt, &ptd->buffer_template);
385 b0 = vlib_get_buffer (vm, po[4].first_buffer_vec_index);
386 b1 = vlib_get_buffer (vm, po[5].first_buffer_vec_index);
387 b2 = vlib_get_buffer (vm, po[6].first_buffer_vec_index);
388 b3 = vlib_get_buffer (vm, po[7].first_buffer_vec_index);
389 vlib_prefetch_buffer_header (b0, STORE);
390 vlib_prefetch_buffer_header (b1, STORE);
391 vlib_prefetch_buffer_header (b2, STORE);
392 vlib_prefetch_buffer_header (b3, STORE);
396 fbvi[0] = po[0].first_buffer_vec_index;
397 fbvi[1] = po[1].first_buffer_vec_index;
398 fbvi[2] = po[2].first_buffer_vec_index;
399 fbvi[3] = po[3].first_buffer_vec_index;
401 bi[0] = ptd->buffers[fbvi[0]];
402 bi[1] = ptd->buffers[fbvi[1]];
403 bi[2] = ptd->buffers[fbvi[2]];
404 bi[3] = ptd->buffers[fbvi[3]];
406 b0 = vlib_get_buffer (vm, bi[0]);
407 b1 = vlib_get_buffer (vm, bi[1]);
408 b2 = vlib_get_buffer (vm, bi[2]);
409 b3 = vlib_get_buffer (vm, bi[3]);
411 vlib_buffer_copy_template (b0, &bt);
412 vlib_buffer_copy_template (b1, &bt);
413 vlib_buffer_copy_template (b2, &bt);
414 vlib_buffer_copy_template (b3, &bt);
416 b0->current_length = po[0].packet_len;
417 n_rx_bytes += b0->current_length;
418 b1->current_length = po[1].packet_len;
419 n_rx_bytes += b1->current_length;
420 b2->current_length = po[2].packet_len;
421 n_rx_bytes += b2->current_length;
422 b3->current_length = po[3].packet_len;
423 n_rx_bytes += b3->current_length;
425 memif_add_to_chain (vm, b0, ptd->buffers + fbvi[0] + 1, buffer_size);
426 memif_add_to_chain (vm, b1, ptd->buffers + fbvi[1] + 1, buffer_size);
427 memif_add_to_chain (vm, b2, ptd->buffers + fbvi[2] + 1, buffer_size);
428 memif_add_to_chain (vm, b3, ptd->buffers + fbvi[3] + 1, buffer_size);
430 if (mode == MEMIF_INTERFACE_MODE_IP)
432 next[0] = memif_next_from_ip_hdr (node, b0);
433 next[1] = memif_next_from_ip_hdr (node, b1);
434 next[2] = memif_next_from_ip_hdr (node, b2);
435 next[3] = memif_next_from_ip_hdr (node, b3);
448 fbvi[0] = po[0].first_buffer_vec_index;
449 bi[0] = ptd->buffers[fbvi[0]];
450 b0 = vlib_get_buffer (vm, bi[0]);
451 vlib_buffer_copy_template (b0, &bt);
452 b0->current_length = po->packet_len;
453 n_rx_bytes += b0->current_length;
455 memif_add_to_chain (vm, b0, ptd->buffers + fbvi[0] + 1, buffer_size);
457 if (mode == MEMIF_INTERFACE_MODE_IP)
459 next[0] = memif_next_from_ip_hdr (node, b0);
469 /* packet trace if enabled */
470 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
472 u32 n_left = n_rx_packets;
476 while (n_trace && n_left)
479 memif_input_trace_t *tr;
480 if (mode != MEMIF_INTERFACE_MODE_ETHERNET)
482 b = vlib_get_buffer (vm, bi[0]);
483 vlib_trace_buffer (vm, node, ni, b, /* follow_chain */ 0);
484 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
486 tr->hw_if_index = mif->hw_if_index;
495 vlib_set_trace_count (vm, node, n_trace);
498 if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
500 n_left_to_next -= n_rx_packets;
501 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
504 vlib_buffer_enqueue_to_next (vm, node, to_next_bufs, nexts, n_rx_packets);
506 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
507 + VNET_INTERFACE_COUNTER_RX, thread_index,
508 mif->hw_if_index, n_rx_packets,
511 /* refill ring with empty buffers */
513 vec_reset_length (ptd->buffers);
514 vec_reset_length (ptd->copy_ops);
516 if (type == MEMIF_RING_M2S)
518 u16 head = ring->head;
519 n_slots = ring_size - head + mq->last_tail;
523 u16 s = head++ & mask;
524 memif_desc_t *d = &ring->desc[s];
525 d->length = mif->run.buffer_size;
528 CLIB_MEMORY_STORE_BARRIER ();
535 static_always_inline uword
536 memif_device_input_zc_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
537 vlib_frame_t * frame, memif_if_t * mif,
538 u16 qid, memif_interface_mode_t mode)
540 vnet_main_t *vnm = vnet_get_main ();
541 memif_main_t *mm = &memif_main;
545 uword n_trace = vlib_get_trace_count (vm, node);
546 u32 n_rx_packets = 0, n_rx_bytes = 0;
547 u32 *to_next = 0, *buffers;
548 u32 bi0, bi1, bi2, bi3;
550 memif_desc_t *d0, *d1, *d2, *d3;
551 vlib_buffer_t *b0, *b1, *b2, *b3;
552 u32 thread_index = vm->thread_index;
553 memif_per_thread_data_t *ptd = vec_elt_at_index (mm->per_thread_data,
555 u16 cur_slot, last_slot, ring_size, n_slots, mask, head;
560 mq = vec_elt_at_index (mif->rx_queues, qid);
562 ring_size = 1 << mq->log2_ring_size;
563 mask = ring_size - 1;
565 next_index = (mode == MEMIF_INTERFACE_MODE_IP) ?
566 VNET_DEVICE_INPUT_NEXT_IP6_INPUT : VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
568 /* asume that somebody will want to add ethernet header on the packet
569 so start with IP header at offset 14 */
570 start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? 14 : 0;
571 buffer_length = VLIB_BUFFER_DATA_SIZE - start_offset;
573 cur_slot = mq->last_tail;
574 last_slot = ring->tail;
575 if (cur_slot == last_slot)
577 n_slots = last_slot - cur_slot;
579 /* process ring slots */
580 vec_validate_aligned (ptd->buffers, MEMIF_RX_VECTOR_SZ,
581 CLIB_CACHE_LINE_BYTES);
582 while (n_slots && n_rx_packets < MEMIF_RX_VECTOR_SZ)
586 s0 = cur_slot & mask;
587 bi0 = mq->buffers[s0];
588 ptd->buffers[n_rx_packets++] = bi0;
590 CLIB_PREFETCH (&ring->desc[(cur_slot + 8) & mask],
591 CLIB_CACHE_LINE_BYTES, LOAD);
592 d0 = &ring->desc[s0];
593 hb = b0 = vlib_get_buffer (vm, bi0);
594 b0->current_data = start_offset;
595 b0->current_length = start_offset + d0->length;
596 n_rx_bytes += d0->length;
598 if (0 && memif_desc_is_invalid (mif, d0, buffer_length))
603 if (PREDICT_FALSE ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots))
605 hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
607 s0 = cur_slot & mask;
608 d0 = &ring->desc[s0];
609 bi0 = mq->buffers[s0];
611 /* previous buffer */
612 b0->next_buffer = bi0;
613 b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
616 b0 = vlib_get_buffer (vm, bi0);
617 b0->current_data = start_offset;
618 b0->current_length = start_offset + d0->length;
619 hb->total_length_not_including_first_buffer += d0->length;
620 n_rx_bytes += d0->length;
624 if ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots)
629 /* release slots from the ring */
630 mq->last_tail = cur_slot;
632 n_from = n_rx_packets;
633 buffers = ptd->buffers;
638 u32 next0, next1, next2, next3;
640 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
641 while (n_from >= 8 && n_left_to_next >= 4)
643 b0 = vlib_get_buffer (vm, buffers[4]);
644 b1 = vlib_get_buffer (vm, buffers[5]);
645 b2 = vlib_get_buffer (vm, buffers[6]);
646 b3 = vlib_get_buffer (vm, buffers[7]);
647 vlib_prefetch_buffer_header (b0, STORE);
648 vlib_prefetch_buffer_header (b1, STORE);
649 vlib_prefetch_buffer_header (b2, STORE);
650 vlib_prefetch_buffer_header (b3, STORE);
653 to_next[0] = bi0 = buffers[0];
654 to_next[1] = bi1 = buffers[1];
655 to_next[2] = bi2 = buffers[2];
656 to_next[3] = bi3 = buffers[3];
661 b0 = vlib_get_buffer (vm, bi0);
662 b1 = vlib_get_buffer (vm, bi1);
663 b2 = vlib_get_buffer (vm, bi2);
664 b3 = vlib_get_buffer (vm, bi3);
666 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
667 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
668 vnet_buffer (b1)->sw_if_index[VLIB_RX] = mif->sw_if_index;
669 vnet_buffer (b1)->sw_if_index[VLIB_TX] = ~0;
670 vnet_buffer (b2)->sw_if_index[VLIB_RX] = mif->sw_if_index;
671 vnet_buffer (b2)->sw_if_index[VLIB_TX] = ~0;
672 vnet_buffer (b3)->sw_if_index[VLIB_RX] = mif->sw_if_index;
673 vnet_buffer (b3)->sw_if_index[VLIB_TX] = ~0;
675 if (mode == MEMIF_INTERFACE_MODE_IP)
677 next0 = memif_next_from_ip_hdr (node, b0);
678 next1 = memif_next_from_ip_hdr (node, b1);
679 next2 = memif_next_from_ip_hdr (node, b2);
680 next3 = memif_next_from_ip_hdr (node, b3);
682 else if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
684 if (PREDICT_FALSE (mif->per_interface_next_index != ~0))
686 next0 = mif->per_interface_next_index;
687 next1 = mif->per_interface_next_index;
688 next2 = mif->per_interface_next_index;
689 next3 = mif->per_interface_next_index;
693 next0 = next1 = next2 = next3 = next_index;
694 /* redirect if feature path enabled */
695 vnet_feature_start_device_input_x1 (mif->sw_if_index,
697 vnet_feature_start_device_input_x1 (mif->sw_if_index,
699 vnet_feature_start_device_input_x1 (mif->sw_if_index,
701 vnet_feature_start_device_input_x1 (mif->sw_if_index,
707 if (PREDICT_FALSE (n_trace > 0))
709 memif_trace_buffer (vm, node, mif, b0, next0, qid, &n_trace);
710 if (PREDICT_FALSE (n_trace > 0))
711 memif_trace_buffer (vm, node, mif, b1, next1, qid, &n_trace);
712 if (PREDICT_FALSE (n_trace > 0))
713 memif_trace_buffer (vm, node, mif, b2, next2, qid, &n_trace);
714 if (PREDICT_FALSE (n_trace > 0))
715 memif_trace_buffer (vm, node, mif, b3, next3, qid, &n_trace);
719 vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
720 n_left_to_next, bi0, bi1, bi2, bi3,
721 next0, next1, next2, next3);
726 while (n_from && n_left_to_next)
729 to_next[0] = bi0 = buffers[0];
734 b0 = vlib_get_buffer (vm, bi0);
735 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
736 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
738 if (mode == MEMIF_INTERFACE_MODE_IP)
740 next0 = memif_next_from_ip_hdr (node, b0);
742 else if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
744 if (PREDICT_FALSE (mif->per_interface_next_index != ~0))
745 next0 = mif->per_interface_next_index;
749 /* redirect if feature path enabled */
750 vnet_feature_start_device_input_x1 (mif->sw_if_index,
756 if (PREDICT_FALSE (n_trace > 0))
757 memif_trace_buffer (vm, node, mif, b0, next0, qid, &n_trace);
760 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
761 n_left_to_next, bi0, next0);
766 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
769 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
770 + VNET_INTERFACE_COUNTER_RX, thread_index,
771 mif->hw_if_index, n_rx_packets,
774 /* refill ring with empty buffers */
776 vec_reset_length (ptd->buffers);
779 n_slots = ring_size - head + mq->last_tail;
784 memif_desc_t *dt = &ptd->desc_template;
785 clib_memset (dt, 0, sizeof (memif_desc_t));
786 dt->length = buffer_length;
788 n_alloc = vlib_buffer_alloc_to_ring_from_pool (vm, mq->buffers, head & mask,
790 mq->buffer_pool_index);
792 if (PREDICT_FALSE (n_alloc != n_slots))
794 vlib_error_count (vm, node->node_index,
795 MEMIF_INPUT_ERROR_BUFFER_ALLOC_FAIL, 1);
798 while (n_alloc >= 32)
800 bi0 = mq->buffers[(head + 4) & mask];
801 vlib_prefetch_buffer_with_index (vm, bi0, LOAD);
802 bi1 = mq->buffers[(head + 5) & mask];
803 vlib_prefetch_buffer_with_index (vm, bi1, LOAD);
804 bi2 = mq->buffers[(head + 6) & mask];
805 vlib_prefetch_buffer_with_index (vm, bi2, LOAD);
806 bi3 = mq->buffers[(head + 7) & mask];
807 vlib_prefetch_buffer_with_index (vm, bi3, LOAD);
814 d0 = &ring->desc[s0];
815 d1 = &ring->desc[s1];
816 d2 = &ring->desc[s2];
817 d3 = &ring->desc[s3];
819 clib_memcpy_fast (d0, dt, sizeof (memif_desc_t));
820 clib_memcpy_fast (d1, dt, sizeof (memif_desc_t));
821 clib_memcpy_fast (d2, dt, sizeof (memif_desc_t));
822 clib_memcpy_fast (d3, dt, sizeof (memif_desc_t));
824 b0 = vlib_get_buffer (vm, mq->buffers[s0]);
825 b1 = vlib_get_buffer (vm, mq->buffers[s1]);
826 b2 = vlib_get_buffer (vm, mq->buffers[s2]);
827 b3 = vlib_get_buffer (vm, mq->buffers[s3]);
829 d0->region = b0->buffer_pool_index + 1;
830 d1->region = b1->buffer_pool_index + 1;
831 d2->region = b2->buffer_pool_index + 1;
832 d3->region = b3->buffer_pool_index + 1;
835 (void *) b0->data - mif->regions[d0->region].shm + start_offset;
837 (void *) b1->data - mif->regions[d1->region].shm + start_offset;
839 (void *) b2->data - mif->regions[d2->region].shm + start_offset;
841 (void *) b3->data - mif->regions[d3->region].shm + start_offset;
848 d0 = &ring->desc[s0];
849 clib_memcpy_fast (d0, dt, sizeof (memif_desc_t));
850 b0 = vlib_get_buffer (vm, mq->buffers[s0]);
851 d0->region = b0->buffer_pool_index + 1;
853 (void *) b0->data - mif->regions[d0->region].shm + start_offset;
858 CLIB_MEMORY_STORE_BARRIER ();
866 VLIB_NODE_FN (memif_input_node) (vlib_main_t * vm,
867 vlib_node_runtime_t * node,
868 vlib_frame_t * frame)
871 memif_main_t *mm = &memif_main;
872 vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
873 vnet_device_and_queue_t *dq;
874 memif_interface_mode_t mode_ip = MEMIF_INTERFACE_MODE_IP;
875 memif_interface_mode_t mode_eth = MEMIF_INTERFACE_MODE_ETHERNET;
877 foreach_device_and_queue (dq, rt->devices_and_queues)
880 mif = vec_elt_at_index (mm->interfaces, dq->dev_instance);
881 if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) &&
882 (mif->flags & MEMIF_IF_FLAG_CONNECTED))
884 if (mif->flags & MEMIF_IF_FLAG_ZERO_COPY)
886 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
887 n_rx += memif_device_input_zc_inline (vm, node, frame, mif,
888 dq->queue_id, mode_ip);
890 n_rx += memif_device_input_zc_inline (vm, node, frame, mif,
891 dq->queue_id, mode_eth);
893 else if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
895 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
896 n_rx += memif_device_input_inline (vm, node, frame, mif,
897 MEMIF_RING_M2S, dq->queue_id,
900 n_rx += memif_device_input_inline (vm, node, frame, mif,
901 MEMIF_RING_M2S, dq->queue_id,
906 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
907 n_rx += memif_device_input_inline (vm, node, frame, mif,
908 MEMIF_RING_S2M, dq->queue_id,
911 n_rx += memif_device_input_inline (vm, node, frame, mif,
912 MEMIF_RING_S2M, dq->queue_id,
922 VLIB_REGISTER_NODE (memif_input_node) = {
923 .name = "memif-input",
924 .sibling_of = "device-input",
925 .format_trace = format_memif_input_trace,
926 .type = VLIB_NODE_TYPE_INPUT,
927 .state = VLIB_NODE_STATE_INTERRUPT,
928 .n_errors = MEMIF_INPUT_N_ERROR,
929 .error_strings = memif_input_error_strings,
936 * fd.io coding-style-patch-verification: ON
939 * eval: (c-set-style "gnu")