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/interface/rx_queue_funcs.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);
96 (b != 0 && vlib_trace_buffer (vm, node, next, b, /* follow_chain */ 0)))
98 memif_input_trace_t *tr;
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_get_default_data_size (vm);
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;
189 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
190 vlib_buffer_t *b0, *b1, *b2, *b3;
191 u32 thread_index = vm->thread_index;
192 memif_per_thread_data_t *ptd = vec_elt_at_index (mm->per_thread_data,
195 u16 cur_slot, last_slot, ring_size, n_slots, mask;
197 u16 n_buffers = 0, n_alloc;
199 memif_packet_op_t *po;
200 memif_region_index_t last_region = ~0;
201 void *last_region_shm = 0;
203 mq = vec_elt_at_index (mif->rx_queues, qid);
205 ring_size = 1 << mq->log2_ring_size;
206 mask = ring_size - 1;
208 /* assume that somebody will want to add ethernet header on the packet
209 so start with IP header at offset 14 */
210 start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? 14 : 0;
212 /* for S2M rings, we are consumers of packet buffers, and for M2S rings we
213 are producers of empty buffers */
214 cur_slot = (type == MEMIF_RING_S2M) ? mq->last_head : mq->last_tail;
215 last_slot = (type == MEMIF_RING_S2M) ? ring->head : ring->tail;
216 if (cur_slot == last_slot)
218 n_slots = last_slot - cur_slot;
220 /* construct copy and packet vector out of ring slots */
221 while (n_slots && n_rx_packets < MEMIF_RX_VECTOR_SZ)
223 u32 dst_off, src_off, n_bytes_left;
227 po = ptd->packet_ops + n_rx_packets;
229 po->first_buffer_vec_index = n_buffers++;
232 dst_off = start_offset;
235 CLIB_PREFETCH (&ring->desc[(cur_slot + 8) & mask],
236 CLIB_CACHE_LINE_BYTES, LOAD);
237 s0 = cur_slot & mask;
238 d0 = &ring->desc[s0];
239 n_bytes_left = d0->length;
241 /* slave resets buffer length,
242 * so it can produce full size buffer for master
244 if (type == MEMIF_RING_M2S)
245 d0->length = mif->run.buffer_size;
247 po->packet_len += n_bytes_left;
248 if (PREDICT_FALSE (last_region != d0->region))
250 last_region_shm = mif->regions[d0->region].shm;
251 last_region = d0->region;
253 mb0 = last_region_shm + d0->offset;
257 u32 dst_free = buffer_size - dst_off;
261 dst_free = buffer_size;
264 u32 bytes_to_copy = clib_min (dst_free, n_bytes_left);
265 memif_add_copy_op (ptd, mb0 + src_off, bytes_to_copy, dst_off,
267 n_bytes_left -= bytes_to_copy;
268 src_off += bytes_to_copy;
269 dst_off += bytes_to_copy;
271 while (PREDICT_FALSE (n_bytes_left));
275 if ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots)
282 /* allocate free buffers */
283 vec_validate_aligned (ptd->buffers, n_buffers - 1, CLIB_CACHE_LINE_BYTES);
284 n_alloc = vlib_buffer_alloc_from_pool (vm, ptd->buffers, n_buffers,
285 mq->buffer_pool_index);
286 if (PREDICT_FALSE (n_alloc != n_buffers))
289 vlib_buffer_free (vm, ptd->buffers, n_alloc);
290 vlib_error_count (vm, node->node_index,
291 MEMIF_INPUT_ERROR_BUFFER_ALLOC_FAIL, 1);
296 n_left = vec_len (ptd->copy_ops);
300 CLIB_PREFETCH (co[4].data, CLIB_CACHE_LINE_BYTES, LOAD);
301 CLIB_PREFETCH (co[5].data, CLIB_CACHE_LINE_BYTES, LOAD);
302 CLIB_PREFETCH (co[6].data, CLIB_CACHE_LINE_BYTES, LOAD);
303 CLIB_PREFETCH (co[7].data, CLIB_CACHE_LINE_BYTES, LOAD);
305 b0 = vlib_get_buffer (vm, ptd->buffers[co[0].buffer_vec_index]);
306 b1 = vlib_get_buffer (vm, ptd->buffers[co[1].buffer_vec_index]);
307 b2 = vlib_get_buffer (vm, ptd->buffers[co[2].buffer_vec_index]);
308 b3 = vlib_get_buffer (vm, ptd->buffers[co[3].buffer_vec_index]);
310 clib_memcpy_fast (b0->data + co[0].buffer_offset, co[0].data,
312 clib_memcpy_fast (b1->data + co[1].buffer_offset, co[1].data,
314 clib_memcpy_fast (b2->data + co[2].buffer_offset, co[2].data,
316 clib_memcpy_fast (b3->data + co[3].buffer_offset, co[3].data,
324 b0 = vlib_get_buffer (vm, ptd->buffers[co[0].buffer_vec_index]);
325 clib_memcpy_fast (b0->data + co[0].buffer_offset, co[0].data,
331 /* release slots from the ring */
332 if (type == MEMIF_RING_S2M)
334 CLIB_MEMORY_STORE_BARRIER ();
335 ring->tail = mq->last_head = cur_slot;
339 mq->last_tail = cur_slot;
342 /* prepare buffer template and next indices */
343 vnet_buffer (&ptd->buffer_template)->sw_if_index[VLIB_RX] =
345 vnet_buffer (&ptd->buffer_template)->feature_arc_index = 0;
346 ptd->buffer_template.current_data = start_offset;
347 ptd->buffer_template.current_config_index = 0;
348 ptd->buffer_template.buffer_pool_index = mq->buffer_pool_index;
349 ptd->buffer_template.ref_count = 1;
351 if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
353 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
354 if (mif->per_interface_next_index != ~0)
355 next_index = mif->per_interface_next_index;
357 vnet_feature_start_device_input_x1 (mif->sw_if_index, &next_index,
358 &ptd->buffer_template);
360 vlib_get_new_next_frame (vm, node, next_index, to_next_bufs,
362 if (PREDICT_TRUE (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT))
364 vlib_next_frame_t *nf;
366 ethernet_input_frame_t *ef;
367 nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
368 f = vlib_get_frame (vm, nf->frame);
369 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
371 ef = vlib_frame_scalar_args (f);
372 ef->sw_if_index = mif->sw_if_index;
373 ef->hw_if_index = mif->hw_if_index;
374 vlib_frame_no_append (f);
378 /* process buffer metadata */
379 u32 n_from = n_rx_packets;
380 po = ptd->packet_ops;
383 /* copy template into local variable - will save per packet load */
384 vlib_buffer_copy_template (&bt, &ptd->buffer_template);
388 b0 = vlib_get_buffer (vm, ptd->buffers[po[0].first_buffer_vec_index]);
389 b1 = vlib_get_buffer (vm, ptd->buffers[po[1].first_buffer_vec_index]);
390 b2 = vlib_get_buffer (vm, ptd->buffers[po[2].first_buffer_vec_index]);
391 b3 = vlib_get_buffer (vm, ptd->buffers[po[3].first_buffer_vec_index]);
393 vlib_prefetch_buffer_header (b0, STORE);
394 vlib_prefetch_buffer_header (b1, STORE);
395 vlib_prefetch_buffer_header (b2, STORE);
396 vlib_prefetch_buffer_header (b3, STORE);
400 fbvi[0] = po[0].first_buffer_vec_index;
401 fbvi[1] = po[1].first_buffer_vec_index;
402 fbvi[2] = po[2].first_buffer_vec_index;
403 fbvi[3] = po[3].first_buffer_vec_index;
405 bi[0] = ptd->buffers[fbvi[0]];
406 bi[1] = ptd->buffers[fbvi[1]];
407 bi[2] = ptd->buffers[fbvi[2]];
408 bi[3] = ptd->buffers[fbvi[3]];
410 b0 = vlib_get_buffer (vm, bi[0]);
411 b1 = vlib_get_buffer (vm, bi[1]);
412 b2 = vlib_get_buffer (vm, bi[2]);
413 b3 = vlib_get_buffer (vm, bi[3]);
415 vlib_buffer_copy_template (b0, &bt);
416 vlib_buffer_copy_template (b1, &bt);
417 vlib_buffer_copy_template (b2, &bt);
418 vlib_buffer_copy_template (b3, &bt);
420 b0->current_length = po[0].packet_len;
421 n_rx_bytes += b0->current_length;
422 b1->current_length = po[1].packet_len;
423 n_rx_bytes += b1->current_length;
424 b2->current_length = po[2].packet_len;
425 n_rx_bytes += b2->current_length;
426 b3->current_length = po[3].packet_len;
427 n_rx_bytes += b3->current_length;
429 memif_add_to_chain (vm, b0, ptd->buffers + fbvi[0] + 1, buffer_size);
430 memif_add_to_chain (vm, b1, ptd->buffers + fbvi[1] + 1, buffer_size);
431 memif_add_to_chain (vm, b2, ptd->buffers + fbvi[2] + 1, buffer_size);
432 memif_add_to_chain (vm, b3, ptd->buffers + fbvi[3] + 1, buffer_size);
434 if (mode == MEMIF_INTERFACE_MODE_IP)
436 next[0] = memif_next_from_ip_hdr (node, b0);
437 next[1] = memif_next_from_ip_hdr (node, b1);
438 next[2] = memif_next_from_ip_hdr (node, b2);
439 next[3] = memif_next_from_ip_hdr (node, b3);
452 fbvi[0] = po[0].first_buffer_vec_index;
453 bi[0] = ptd->buffers[fbvi[0]];
454 b0 = vlib_get_buffer (vm, bi[0]);
455 vlib_buffer_copy_template (b0, &bt);
456 b0->current_length = po->packet_len;
457 n_rx_bytes += b0->current_length;
459 memif_add_to_chain (vm, b0, ptd->buffers + fbvi[0] + 1, buffer_size);
461 if (mode == MEMIF_INTERFACE_MODE_IP)
463 next[0] = memif_next_from_ip_hdr (node, b0);
473 /* packet trace if enabled */
474 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
476 u32 n_left = n_rx_packets;
480 while (n_trace && n_left)
483 memif_input_trace_t *tr;
484 if (mode != MEMIF_INTERFACE_MODE_ETHERNET)
486 b = vlib_get_buffer (vm, bi[0]);
488 (vlib_trace_buffer (vm, node, ni, b, /* follow_chain */ 0)))
490 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
492 tr->hw_if_index = mif->hw_if_index;
502 vlib_set_trace_count (vm, node, n_trace);
505 if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
507 n_left_to_next -= n_rx_packets;
508 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
511 vlib_buffer_enqueue_to_next (vm, node, to_next_bufs, nexts, n_rx_packets);
513 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
514 + VNET_INTERFACE_COUNTER_RX, thread_index,
515 mif->sw_if_index, n_rx_packets,
518 /* refill ring with empty buffers */
520 vec_reset_length (ptd->buffers);
521 vec_reset_length (ptd->copy_ops);
523 if (type == MEMIF_RING_M2S)
525 u16 head = ring->head;
526 n_slots = ring_size - head + mq->last_tail;
530 u16 s = head++ & mask;
531 memif_desc_t *d = &ring->desc[s];
532 d->length = mif->run.buffer_size;
535 CLIB_MEMORY_STORE_BARRIER ();
542 static_always_inline uword
543 memif_device_input_zc_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
544 vlib_frame_t * frame, memif_if_t * mif,
545 u16 qid, memif_interface_mode_t mode)
547 vnet_main_t *vnm = vnet_get_main ();
548 memif_main_t *mm = &memif_main;
552 uword n_trace = vlib_get_trace_count (vm, node);
553 u32 n_rx_packets = 0, n_rx_bytes = 0;
554 u32 *to_next = 0, *buffers;
555 u32 bi0, bi1, bi2, bi3;
557 memif_desc_t *d0, *d1, *d2, *d3;
558 vlib_buffer_t *b0, *b1, *b2, *b3;
559 u32 thread_index = vm->thread_index;
560 memif_per_thread_data_t *ptd = vec_elt_at_index (mm->per_thread_data,
562 u16 cur_slot, last_slot, ring_size, n_slots, mask, head;
567 mq = vec_elt_at_index (mif->rx_queues, qid);
569 ring_size = 1 << mq->log2_ring_size;
570 mask = ring_size - 1;
572 next_index = (mode == MEMIF_INTERFACE_MODE_IP) ?
573 VNET_DEVICE_INPUT_NEXT_IP6_INPUT : VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
575 /* asume that somebody will want to add ethernet header on the packet
576 so start with IP header at offset 14 */
577 start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? 14 : 0;
578 buffer_length = vlib_buffer_get_default_data_size (vm) - start_offset;
580 cur_slot = mq->last_tail;
581 last_slot = ring->tail;
582 if (cur_slot == last_slot)
584 n_slots = last_slot - cur_slot;
586 /* process ring slots */
587 vec_validate_aligned (ptd->buffers, MEMIF_RX_VECTOR_SZ,
588 CLIB_CACHE_LINE_BYTES);
589 while (n_slots && n_rx_packets < MEMIF_RX_VECTOR_SZ)
593 s0 = cur_slot & mask;
594 bi0 = mq->buffers[s0];
595 ptd->buffers[n_rx_packets++] = bi0;
597 CLIB_PREFETCH (&ring->desc[(cur_slot + 8) & mask],
598 CLIB_CACHE_LINE_BYTES, LOAD);
599 d0 = &ring->desc[s0];
600 hb = b0 = vlib_get_buffer (vm, bi0);
601 b0->current_data = start_offset;
602 b0->current_length = d0->length;
603 n_rx_bytes += d0->length;
605 if (0 && memif_desc_is_invalid (mif, d0, buffer_length))
610 if (PREDICT_FALSE ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots))
612 hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
614 s0 = cur_slot & mask;
615 d0 = &ring->desc[s0];
616 bi0 = mq->buffers[s0];
618 /* previous buffer */
619 b0->next_buffer = bi0;
620 b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
623 b0 = vlib_get_buffer (vm, bi0);
624 b0->current_data = start_offset;
625 b0->current_length = d0->length;
626 hb->total_length_not_including_first_buffer += d0->length;
627 n_rx_bytes += d0->length;
631 if ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots)
636 /* release slots from the ring */
637 mq->last_tail = cur_slot;
639 n_from = n_rx_packets;
640 buffers = ptd->buffers;
645 u32 next0, next1, next2, next3;
647 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
648 while (n_from >= 8 && n_left_to_next >= 4)
650 b0 = vlib_get_buffer (vm, buffers[4]);
651 b1 = vlib_get_buffer (vm, buffers[5]);
652 b2 = vlib_get_buffer (vm, buffers[6]);
653 b3 = vlib_get_buffer (vm, buffers[7]);
654 vlib_prefetch_buffer_header (b0, STORE);
655 vlib_prefetch_buffer_header (b1, STORE);
656 vlib_prefetch_buffer_header (b2, STORE);
657 vlib_prefetch_buffer_header (b3, STORE);
660 to_next[0] = bi0 = buffers[0];
661 to_next[1] = bi1 = buffers[1];
662 to_next[2] = bi2 = buffers[2];
663 to_next[3] = bi3 = buffers[3];
668 b0 = vlib_get_buffer (vm, bi0);
669 b1 = vlib_get_buffer (vm, bi1);
670 b2 = vlib_get_buffer (vm, bi2);
671 b3 = vlib_get_buffer (vm, bi3);
673 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
674 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
675 vnet_buffer (b1)->sw_if_index[VLIB_RX] = mif->sw_if_index;
676 vnet_buffer (b1)->sw_if_index[VLIB_TX] = ~0;
677 vnet_buffer (b2)->sw_if_index[VLIB_RX] = mif->sw_if_index;
678 vnet_buffer (b2)->sw_if_index[VLIB_TX] = ~0;
679 vnet_buffer (b3)->sw_if_index[VLIB_RX] = mif->sw_if_index;
680 vnet_buffer (b3)->sw_if_index[VLIB_TX] = ~0;
682 if (mode == MEMIF_INTERFACE_MODE_IP)
684 next0 = memif_next_from_ip_hdr (node, b0);
685 next1 = memif_next_from_ip_hdr (node, b1);
686 next2 = memif_next_from_ip_hdr (node, b2);
687 next3 = memif_next_from_ip_hdr (node, b3);
689 else if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
691 if (PREDICT_FALSE (mif->per_interface_next_index != ~0))
693 next0 = mif->per_interface_next_index;
694 next1 = mif->per_interface_next_index;
695 next2 = mif->per_interface_next_index;
696 next3 = mif->per_interface_next_index;
700 next0 = next1 = next2 = next3 = next_index;
701 /* redirect if feature path enabled */
702 vnet_feature_start_device_input_x1 (mif->sw_if_index,
704 vnet_feature_start_device_input_x1 (mif->sw_if_index,
706 vnet_feature_start_device_input_x1 (mif->sw_if_index,
708 vnet_feature_start_device_input_x1 (mif->sw_if_index,
714 if (PREDICT_FALSE (n_trace > 0))
716 memif_trace_buffer (vm, node, mif, b0, next0, qid, &n_trace);
717 if (PREDICT_FALSE (n_trace > 0))
718 memif_trace_buffer (vm, node, mif, b1, next1, qid, &n_trace);
719 if (PREDICT_FALSE (n_trace > 0))
720 memif_trace_buffer (vm, node, mif, b2, next2, qid, &n_trace);
721 if (PREDICT_FALSE (n_trace > 0))
722 memif_trace_buffer (vm, node, mif, b3, next3, qid, &n_trace);
726 vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
727 n_left_to_next, bi0, bi1, bi2, bi3,
728 next0, next1, next2, next3);
733 while (n_from && n_left_to_next)
736 to_next[0] = bi0 = buffers[0];
741 b0 = vlib_get_buffer (vm, bi0);
742 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
743 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
745 if (mode == MEMIF_INTERFACE_MODE_IP)
747 next0 = memif_next_from_ip_hdr (node, b0);
749 else if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
751 if (PREDICT_FALSE (mif->per_interface_next_index != ~0))
752 next0 = mif->per_interface_next_index;
756 /* redirect if feature path enabled */
757 vnet_feature_start_device_input_x1 (mif->sw_if_index,
763 if (PREDICT_FALSE (n_trace > 0))
764 memif_trace_buffer (vm, node, mif, b0, next0, qid, &n_trace);
767 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
768 n_left_to_next, bi0, next0);
773 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
776 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
777 + VNET_INTERFACE_COUNTER_RX, thread_index,
778 mif->sw_if_index, n_rx_packets,
781 /* refill ring with empty buffers */
783 vec_reset_length (ptd->buffers);
786 n_slots = ring_size - head + mq->last_tail;
791 memif_desc_t *dt = &ptd->desc_template;
792 clib_memset (dt, 0, sizeof (memif_desc_t));
793 dt->length = buffer_length;
795 n_alloc = vlib_buffer_alloc_to_ring_from_pool (vm, mq->buffers, head & mask,
797 mq->buffer_pool_index);
799 if (PREDICT_FALSE (n_alloc != n_slots))
801 vlib_error_count (vm, node->node_index,
802 MEMIF_INPUT_ERROR_BUFFER_ALLOC_FAIL, 1);
805 while (n_alloc >= 32)
807 bi0 = mq->buffers[(head + 4) & mask];
808 vlib_prefetch_buffer_with_index (vm, bi0, LOAD);
809 bi1 = mq->buffers[(head + 5) & mask];
810 vlib_prefetch_buffer_with_index (vm, bi1, LOAD);
811 bi2 = mq->buffers[(head + 6) & mask];
812 vlib_prefetch_buffer_with_index (vm, bi2, LOAD);
813 bi3 = mq->buffers[(head + 7) & mask];
814 vlib_prefetch_buffer_with_index (vm, bi3, LOAD);
821 d0 = &ring->desc[s0];
822 d1 = &ring->desc[s1];
823 d2 = &ring->desc[s2];
824 d3 = &ring->desc[s3];
826 clib_memcpy_fast (d0, dt, sizeof (memif_desc_t));
827 clib_memcpy_fast (d1, dt, sizeof (memif_desc_t));
828 clib_memcpy_fast (d2, dt, sizeof (memif_desc_t));
829 clib_memcpy_fast (d3, dt, sizeof (memif_desc_t));
831 b0 = vlib_get_buffer (vm, mq->buffers[s0]);
832 b1 = vlib_get_buffer (vm, mq->buffers[s1]);
833 b2 = vlib_get_buffer (vm, mq->buffers[s2]);
834 b3 = vlib_get_buffer (vm, mq->buffers[s3]);
836 d0->region = b0->buffer_pool_index + 1;
837 d1->region = b1->buffer_pool_index + 1;
838 d2->region = b2->buffer_pool_index + 1;
839 d3->region = b3->buffer_pool_index + 1;
842 (void *) b0->data - mif->regions[d0->region].shm + start_offset;
844 (void *) b1->data - mif->regions[d1->region].shm + start_offset;
846 (void *) b2->data - mif->regions[d2->region].shm + start_offset;
848 (void *) b3->data - mif->regions[d3->region].shm + start_offset;
855 d0 = &ring->desc[s0];
856 clib_memcpy_fast (d0, dt, sizeof (memif_desc_t));
857 b0 = vlib_get_buffer (vm, mq->buffers[s0]);
858 d0->region = b0->buffer_pool_index + 1;
860 (void *) b0->data - mif->regions[d0->region].shm + start_offset;
865 CLIB_MEMORY_STORE_BARRIER ();
873 VLIB_NODE_FN (memif_input_node) (vlib_main_t * vm,
874 vlib_node_runtime_t * node,
875 vlib_frame_t * frame)
878 memif_main_t *mm = &memif_main;
879 memif_interface_mode_t mode_ip = MEMIF_INTERFACE_MODE_IP;
880 memif_interface_mode_t mode_eth = MEMIF_INTERFACE_MODE_ETHERNET;
882 vnet_hw_if_rxq_poll_vector_t *pv;
883 pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
884 for (int i = 0; i < vec_len (pv); i++)
888 mif = vec_elt_at_index (mm->interfaces, pv[i].dev_instance);
889 qid = pv[i].queue_id;
890 if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) &&
891 (mif->flags & MEMIF_IF_FLAG_CONNECTED))
893 if (mif->flags & MEMIF_IF_FLAG_ZERO_COPY)
895 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
896 n_rx += memif_device_input_zc_inline (vm, node, frame, mif,
899 n_rx += memif_device_input_zc_inline (vm, node, frame, mif,
902 else if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
904 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
905 n_rx += memif_device_input_inline (
906 vm, node, frame, mif, MEMIF_RING_M2S, qid, mode_ip);
908 n_rx += memif_device_input_inline (
909 vm, node, frame, mif, MEMIF_RING_M2S, qid, mode_eth);
913 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
914 n_rx += memif_device_input_inline (
915 vm, node, frame, mif, MEMIF_RING_S2M, qid, mode_ip);
917 n_rx += memif_device_input_inline (
918 vm, node, frame, mif, MEMIF_RING_S2M, qid, mode_eth);
927 VLIB_REGISTER_NODE (memif_input_node) = {
928 .name = "memif-input",
929 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
930 .sibling_of = "device-input",
931 .format_trace = format_memif_input_trace,
932 .type = VLIB_NODE_TYPE_INPUT,
933 .state = VLIB_NODE_STATE_INTERRUPT,
934 .n_errors = MEMIF_INPUT_N_ERROR,
935 .error_strings = memif_input_error_strings,
942 * fd.io coding-style-patch-verification: ON
945 * eval: (c-set-style "gnu")