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 MEMIF_IP_OFFSET 14
35 #define foreach_memif_input_error \
36 _ (BUFFER_ALLOC_FAIL, buffer_alloc, ERROR, "buffer allocation failed") \
37 _ (BAD_DESC, bad_desc, ERROR, "bad descriptor") \
38 _ (NOT_IP, not_ip, INFO, "not ip packet")
42 #define _(f, n, s, d) MEMIF_INPUT_ERROR_##f,
43 foreach_memif_input_error
46 } memif_input_error_t;
48 static vlib_error_desc_t memif_input_error_counters[] = {
49 #define _(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s },
50 foreach_memif_input_error
59 } memif_input_trace_t;
61 static __clib_unused u8 *
62 format_memif_input_trace (u8 * s, va_list * args)
64 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
65 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
66 memif_input_trace_t *t = va_arg (*args, memif_input_trace_t *);
67 u32 indent = format_get_indent (s);
69 s = format (s, "memif: hw_if_index %d next-index %d",
70 t->hw_if_index, t->next_index);
71 s = format (s, "\n%Uslot: ring %u", format_white_space, indent + 2,
76 static_always_inline u32
77 memif_next_from_ip_hdr (vlib_node_runtime_t * node, vlib_buffer_t * b)
79 u8 *ptr = vlib_buffer_get_current (b);
82 if (PREDICT_TRUE (v == 0x40))
83 return VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
84 else if (PREDICT_TRUE (v == 0x60))
85 return VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
87 b->error = node->errors[MEMIF_INPUT_ERROR_NOT_IP];
88 return VNET_DEVICE_INPUT_NEXT_DROP;
91 static_always_inline void
92 memif_trace_buffer (vlib_main_t * vm, vlib_node_runtime_t * node,
93 memif_if_t * mif, vlib_buffer_t * b, u32 next, u16 qid,
97 (b != 0 && vlib_trace_buffer (vm, node, next, b, /* follow_chain */ 0)))
99 memif_input_trace_t *tr;
100 vlib_set_trace_count (vm, node, --(*n_tracep));
101 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
102 tr->next_index = next;
103 tr->hw_if_index = mif->hw_if_index;
108 static_always_inline void
109 memif_add_copy_op (memif_per_thread_data_t * ptd, void *data, u32 len,
110 u16 buffer_offset, u16 buffer_vec_index)
113 vec_add2_aligned (ptd->copy_ops, co, 1, CLIB_CACHE_LINE_BYTES);
116 co->buffer_offset = buffer_offset;
117 co->buffer_vec_index = buffer_vec_index;
120 static_always_inline void
121 memif_add_to_chain (vlib_main_t * vm, vlib_buffer_t * b, u32 * buffers,
124 vlib_buffer_t *seg = b;
125 i32 bytes_left = b->current_length - buffer_size + b->current_data;
127 if (PREDICT_TRUE (bytes_left <= 0))
130 b->current_length -= bytes_left;
131 b->total_length_not_including_first_buffer = bytes_left;
135 seg->flags |= VLIB_BUFFER_NEXT_PRESENT;
136 seg->next_buffer = buffers[0];
137 seg = vlib_get_buffer (vm, buffers[0]);
139 seg->current_data = 0;
140 seg->current_length = clib_min (buffer_size, bytes_left);
141 bytes_left -= seg->current_length;
145 static_always_inline u16
146 memif_parse_desc (memif_per_thread_data_t *ptd, memif_if_t *mif,
147 memif_queue_t *mq, u16 next, u16 n_avail)
149 memif_ring_t *ring = mq->ring;
150 memif_desc_t *descs = ring->desc;
151 void **desc_data = ptd->desc_data;
152 u16 *desc_len = ptd->desc_len;
153 memif_desc_status_t *desc_status = ptd->desc_status;
154 u16 n_desc = 0, n_pkts = 0;
156 u16 mask = pow2_mask (mq->log2_ring_size);
163 d = descs + (slot++ & mask);
164 desc_data[i] = (void *) ((u64) d->region << 32 | d->offset);
165 desc_len[i] = d->length;
166 desc_status[i].as_u8 = flags = d->flags;
168 if (PREDICT_FALSE ((flags & MEMIF_DESC_FLAG_NEXT)) == 0)
171 if (++n_pkts == MEMIF_RX_VECTOR_SZ)
178 ptd->n_packets = n_pkts;
182 static_always_inline void
183 memif_desc_status_set_err (memif_desc_status_t *p,
184 memif_desc_status_err_code_t e)
186 memif_desc_status_t s = { .err = 1, .err_code = e };
190 static_always_inline void
191 memif_validate_desc_data (memif_per_thread_data_t *ptd, memif_if_t *mif,
192 u16 n_desc, int is_ethernet)
194 void **desc_data = ptd->desc_data;
195 u16 *desc_len = ptd->desc_len;
196 memif_desc_status_t *desc_status = ptd->desc_status;
197 u16 n_regions = vec_len (mif->regions);
202 for (u32 i = 0; i < n_desc; i++)
204 u16 region = ((u64) desc_data[i]) >> 32;
205 u32 offset = (u64) desc_data[i];
206 u16 len = desc_len[i];
207 memif_region_t *r = mif->regions + region;
209 if (region >= n_regions)
210 memif_desc_status_set_err (desc_status + i,
211 MEMIF_DESC_STATUS_ERR_BAD_REGION);
212 else if (offset + len > r->region_size)
213 memif_desc_status_set_err (desc_status + i,
214 MEMIF_DESC_STATUS_ERR_REGION_OVERRUN);
215 else if (is_ethernet && len > ETHERNET_MAX_PACKET_BYTES)
216 memif_desc_status_set_err (desc_status + i,
217 MEMIF_DESC_STATUS_ERR_DATA_TOO_BIG);
219 memif_desc_status_set_err (desc_status + i,
220 MEMIF_DESC_STATUS_ERR_ZERO_LENGTH);
223 desc_data[i] = r->shm + offset;
228 xor_status |= desc_status[i].as_u8;
231 ptd->max_desc_len = max_len;
232 ptd->xor_status = xor_status;
233 ptd->n_rx_bytes = n_rx_bytes;
236 static_always_inline u32
237 memif_process_desc (vlib_main_t *vm, vlib_node_runtime_t *node,
238 memif_per_thread_data_t *ptd, memif_if_t *mif)
240 u16 buffer_size = vlib_buffer_get_default_data_size (vm);
241 int is_ip = mif->mode == MEMIF_INTERFACE_MODE_IP;
242 i16 start_offset = (is_ip) ? MEMIF_IP_OFFSET : 0;
243 memif_packet_op_t *po = ptd->packet_ops;
244 void **desc_data = ptd->desc_data;
245 u16 *desc_len = ptd->desc_len;
246 memif_desc_status_t *desc_status = ptd->desc_status;
248 u32 n_left = ptd->n_packets;
253 /* construct copy and packet vector out of ring slots */
256 u32 dst_off, src_off, n_bytes_left;
258 po->first_buffer_vec_index = n_buffers++;
262 dst_off = start_offset;
265 i++; /* next descriptor */
266 n_bytes_left = desc_len[i];
268 packet_len += n_bytes_left;
271 if (PREDICT_FALSE (desc_status[i].err))
273 vlib_error_count (vm, node->node_index, MEMIF_INPUT_ERROR_BAD_DESC,
276 ASSERT (n_buffers > 0);
283 u32 dst_free = buffer_size - dst_off;
287 dst_free = buffer_size;
290 u32 bytes_to_copy = clib_min (dst_free, n_bytes_left);
291 memif_add_copy_op (ptd, mb0 + src_off, bytes_to_copy, dst_off,
293 n_bytes_left -= bytes_to_copy;
294 src_off += bytes_to_copy;
295 dst_off += bytes_to_copy;
297 while (PREDICT_FALSE (n_bytes_left));
299 if (desc_status[i].next)
305 /* update packet op */
306 po->packet_len = packet_len;
313 ASSERT (ptd->n_packets >= bad_packets);
314 ptd->n_packets -= bad_packets;
317 static_always_inline void
318 memif_fill_buffer_mdata_simple (vlib_node_runtime_t *node,
319 memif_per_thread_data_t *ptd,
320 vlib_buffer_t **b, u16 *next, int is_ip)
323 u16 *dl = ptd->desc_len;
324 /* process buffer metadata */
326 u32 n_left = ptd->n_packets;
328 /* copy template into local variable - will save per packet load */
329 vlib_buffer_copy_template (&bt, &ptd->buffer_template);
333 vlib_prefetch_buffer_header (b[4], STORE);
334 vlib_prefetch_buffer_header (b[5], STORE);
335 vlib_prefetch_buffer_header (b[6], STORE);
336 vlib_prefetch_buffer_header (b[7], STORE);
338 vlib_buffer_copy_template (b[0], &bt);
339 vlib_buffer_copy_template (b[1], &bt);
340 vlib_buffer_copy_template (b[2], &bt);
341 vlib_buffer_copy_template (b[3], &bt);
343 b[0]->current_length = dl[0];
344 b[1]->current_length = dl[1];
345 b[2]->current_length = dl[2];
346 b[3]->current_length = dl[3];
350 next[0] = memif_next_from_ip_hdr (node, b[0]);
351 next[1] = memif_next_from_ip_hdr (node, b[1]);
352 next[2] = memif_next_from_ip_hdr (node, b[2]);
353 next[3] = memif_next_from_ip_hdr (node, b[3]);
366 vlib_buffer_copy_template (b[0], &bt);
367 b[0]->current_length = dl[0];
369 next[0] = memif_next_from_ip_hdr (node, b[0]);
379 static_always_inline void
380 memif_fill_buffer_mdata (vlib_main_t *vm, vlib_node_runtime_t *node,
381 memif_per_thread_data_t *ptd, memif_if_t *mif,
382 u32 *bi, u16 *next, int is_ip)
384 u16 buffer_size = vlib_buffer_get_default_data_size (vm);
385 vlib_buffer_t *b0, *b1, *b2, *b3, bt;
386 memif_packet_op_t *po;
387 /* process buffer metadata */
389 u32 n_from = ptd->n_packets;
390 po = ptd->packet_ops;
392 /* copy template into local variable - will save per packet load */
393 vlib_buffer_copy_template (&bt, &ptd->buffer_template);
397 b0 = vlib_get_buffer (vm, ptd->buffers[po[4].first_buffer_vec_index]);
398 b1 = vlib_get_buffer (vm, ptd->buffers[po[5].first_buffer_vec_index]);
399 b2 = vlib_get_buffer (vm, ptd->buffers[po[6].first_buffer_vec_index]);
400 b3 = vlib_get_buffer (vm, ptd->buffers[po[7].first_buffer_vec_index]);
402 vlib_prefetch_buffer_header (b0, STORE);
403 vlib_prefetch_buffer_header (b1, STORE);
404 vlib_prefetch_buffer_header (b2, STORE);
405 vlib_prefetch_buffer_header (b3, STORE);
409 fbvi[0] = po[0].first_buffer_vec_index;
410 fbvi[1] = po[1].first_buffer_vec_index;
411 fbvi[2] = po[2].first_buffer_vec_index;
412 fbvi[3] = po[3].first_buffer_vec_index;
414 bi[0] = ptd->buffers[fbvi[0]];
415 bi[1] = ptd->buffers[fbvi[1]];
416 bi[2] = ptd->buffers[fbvi[2]];
417 bi[3] = ptd->buffers[fbvi[3]];
419 b0 = vlib_get_buffer (vm, bi[0]);
420 b1 = vlib_get_buffer (vm, bi[1]);
421 b2 = vlib_get_buffer (vm, bi[2]);
422 b3 = vlib_get_buffer (vm, bi[3]);
424 vlib_buffer_copy_template (b0, &bt);
425 vlib_buffer_copy_template (b1, &bt);
426 vlib_buffer_copy_template (b2, &bt);
427 vlib_buffer_copy_template (b3, &bt);
429 b0->current_length = po[0].packet_len;
430 b1->current_length = po[1].packet_len;
431 b2->current_length = po[2].packet_len;
432 b3->current_length = po[3].packet_len;
434 memif_add_to_chain (vm, b0, ptd->buffers + fbvi[0] + 1, buffer_size);
435 memif_add_to_chain (vm, b1, ptd->buffers + fbvi[1] + 1, buffer_size);
436 memif_add_to_chain (vm, b2, ptd->buffers + fbvi[2] + 1, buffer_size);
437 memif_add_to_chain (vm, b3, ptd->buffers + fbvi[3] + 1, buffer_size);
441 next[0] = memif_next_from_ip_hdr (node, b0);
442 next[1] = memif_next_from_ip_hdr (node, b1);
443 next[2] = memif_next_from_ip_hdr (node, b2);
444 next[3] = memif_next_from_ip_hdr (node, b3);
457 fbvi[0] = po[0].first_buffer_vec_index;
458 bi[0] = ptd->buffers[fbvi[0]];
459 b0 = vlib_get_buffer (vm, bi[0]);
460 vlib_buffer_copy_template (b0, &bt);
461 b0->current_length = po->packet_len;
463 memif_add_to_chain (vm, b0, ptd->buffers + fbvi[0] + 1, buffer_size);
466 next[0] = memif_next_from_ip_hdr (node, b0);
476 static_always_inline void
477 memif_advance_ring (memif_ring_type_t type, memif_queue_t *mq,
478 memif_ring_t *ring, u16 cur_slot)
480 if (type == MEMIF_RING_S2M)
482 __atomic_store_n (&ring->tail, cur_slot, __ATOMIC_RELEASE);
483 mq->last_head = cur_slot;
487 mq->last_tail = cur_slot;
491 static_always_inline uword
492 memif_device_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
493 memif_if_t *mif, memif_ring_type_t type, u16 qid,
494 memif_interface_mode_t mode)
496 vnet_main_t *vnm = vnet_get_main ();
497 memif_main_t *mm = &memif_main;
500 u16 buffer_size = vlib_buffer_get_default_data_size (vm);
502 u16 nexts[MEMIF_RX_VECTOR_SZ], *next = nexts;
503 u32 _to_next_bufs[MEMIF_RX_VECTOR_SZ], *to_next_bufs = _to_next_bufs, *bi;
505 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
506 vlib_buffer_t *buffer_ptrs[MEMIF_RX_VECTOR_SZ];
507 u32 thread_index = vm->thread_index;
508 memif_per_thread_data_t *ptd =
509 vec_elt_at_index (mm->per_thread_data, thread_index);
510 u16 cur_slot, ring_size, n_slots, mask;
511 u16 n_buffers, n_alloc, n_desc;
514 int is_slave = (mif->flags & MEMIF_IF_FLAG_IS_SLAVE) != 0;
518 mq = vec_elt_at_index (mif->rx_queues, qid);
520 ring_size = 1 << mq->log2_ring_size;
521 mask = ring_size - 1;
523 start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? MEMIF_IP_OFFSET : 0;
527 cur_slot = mq->last_tail;
528 n_slots = __atomic_load_n (&ring->tail, __ATOMIC_ACQUIRE) - cur_slot;
532 cur_slot = mq->last_head;
533 n_slots = __atomic_load_n (&ring->head, __ATOMIC_ACQUIRE) - cur_slot;
539 n_desc = memif_parse_desc (ptd, mif, mq, cur_slot, n_slots);
541 if (n_desc != ptd->n_packets)
546 if (mif->mode == MEMIF_INTERFACE_MODE_ETHERNET)
547 memif_validate_desc_data (ptd, mif, n_desc, /* is_ethernet */ 1);
549 memif_validate_desc_data (ptd, mif, n_desc, /* is_ethernet */ 0);
551 if (ptd->max_desc_len > buffer_size - start_offset)
554 if (ptd->xor_status != 0)
558 n_buffers = ptd->n_packets;
560 n_buffers = memif_process_desc (vm, node, ptd, mif);
562 if (PREDICT_FALSE (n_buffers == 0))
564 /* All descriptors are bad. Release slots in the ring and bail */
565 memif_advance_ring (type, mq, ring, cur_slot);
569 /* allocate free buffers */
570 vec_validate_aligned (ptd->buffers, n_buffers - 1, CLIB_CACHE_LINE_BYTES);
571 n_alloc = vlib_buffer_alloc_from_pool (vm, ptd->buffers, n_buffers,
572 mq->buffer_pool_index);
573 if (PREDICT_FALSE (n_alloc != n_buffers))
576 vlib_buffer_free (vm, ptd->buffers, n_alloc);
577 vlib_error_count (vm, node->node_index,
578 MEMIF_INPUT_ERROR_BUFFER_ALLOC_FAIL, 1);
585 int n_pkts = ptd->n_packets;
586 void **desc_data = ptd->desc_data;
587 u16 *desc_len = ptd->desc_len;
589 vlib_get_buffers (vm, ptd->buffers, buffer_ptrs, n_buffers);
591 for (i = 0; i + 8 < n_pkts; i++)
593 clib_prefetch_load (desc_data[i + 8]);
594 clib_prefetch_store (buffer_ptrs[i + 8]->data);
595 clib_memcpy_fast (buffer_ptrs[i]->data + start_offset, desc_data[i],
598 for (; i < n_pkts; i++)
599 clib_memcpy_fast (buffer_ptrs[i]->data + start_offset, desc_data[i],
605 u32 n_pkts = vec_len (ptd->copy_ops);
608 for (i = 0; i + 8 < n_pkts; i++)
610 clib_prefetch_load (co[i + 8].data);
611 b = vlib_get_buffer (vm, ptd->buffers[co[i].buffer_vec_index]);
612 clib_memcpy_fast (b->data + co[i].buffer_offset, co[i].data,
615 for (; i < n_pkts; i++)
617 b = vlib_get_buffer (vm, ptd->buffers[co[i].buffer_vec_index]);
618 clib_memcpy_fast (b->data + co[i].buffer_offset, co[i].data,
623 /* release slots from the ring */
624 memif_advance_ring (type, mq, ring, cur_slot);
626 /* prepare buffer template and next indices */
627 vnet_buffer (&ptd->buffer_template)->sw_if_index[VLIB_RX] = mif->sw_if_index;
628 vnet_buffer (&ptd->buffer_template)->feature_arc_index = 0;
629 ptd->buffer_template.current_data = start_offset;
630 ptd->buffer_template.current_config_index = 0;
631 ptd->buffer_template.buffer_pool_index = mq->buffer_pool_index;
632 ptd->buffer_template.ref_count = 1;
634 if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
636 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
637 if (mif->per_interface_next_index != ~0)
638 next_index = mif->per_interface_next_index;
640 vnet_feature_start_device_input_x1 (mif->sw_if_index, &next_index,
641 &ptd->buffer_template);
643 vlib_get_new_next_frame (vm, node, next_index, to_next_bufs,
645 if (PREDICT_TRUE (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT))
647 vlib_next_frame_t *nf;
649 ethernet_input_frame_t *ef;
650 nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
651 f = vlib_get_frame (vm, nf->frame);
652 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
654 ef = vlib_frame_scalar_args (f);
655 ef->sw_if_index = mif->sw_if_index;
656 ef->hw_if_index = mif->hw_if_index;
657 vlib_frame_no_append (f);
663 vlib_buffer_copy_indices (to_next_bufs, ptd->buffers, ptd->n_packets);
664 if (mode == MEMIF_INTERFACE_MODE_IP)
665 memif_fill_buffer_mdata_simple (node, ptd, buffer_ptrs, nexts, 1);
667 memif_fill_buffer_mdata_simple (node, ptd, buffer_ptrs, nexts, 0);
671 if (mode == MEMIF_INTERFACE_MODE_IP)
672 memif_fill_buffer_mdata (vm, node, ptd, mif, to_next_bufs, nexts, 1);
674 memif_fill_buffer_mdata (vm, node, ptd, mif, to_next_bufs, nexts, 0);
677 /* packet trace if enabled */
678 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
680 u32 n_left = ptd->n_packets;
684 while (n_trace && n_left)
687 memif_input_trace_t *tr;
688 if (mode != MEMIF_INTERFACE_MODE_ETHERNET)
690 b = vlib_get_buffer (vm, bi[0]);
692 (vlib_trace_buffer (vm, node, ni, b, /* follow_chain */ 0)))
694 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
696 tr->hw_if_index = mif->hw_if_index;
706 vlib_set_trace_count (vm, node, n_trace);
709 if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
711 n_left_to_next -= ptd->n_packets;
712 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
715 vlib_buffer_enqueue_to_next (vm, node, to_next_bufs, nexts,
718 vlib_increment_combined_counter (
719 vnm->interface_main.combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
720 thread_index, mif->sw_if_index, ptd->n_packets, ptd->n_rx_bytes);
722 /* refill ring with empty buffers */
724 vec_reset_length (ptd->buffers);
725 vec_reset_length (ptd->copy_ops);
727 if (type == MEMIF_RING_M2S)
729 u16 head = ring->head;
730 n_slots = ring_size - head + mq->last_tail;
734 u16 s = head++ & mask;
735 memif_desc_t *d = &ring->desc[s];
736 d->length = mif->run.buffer_size;
739 __atomic_store_n (&ring->head, head, __ATOMIC_RELEASE);
742 return ptd->n_packets;
745 static_always_inline uword
746 memif_device_input_zc_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
747 memif_if_t *mif, u16 qid,
748 memif_interface_mode_t mode)
750 vnet_main_t *vnm = vnet_get_main ();
751 memif_main_t *mm = &memif_main;
755 uword n_trace = vlib_get_trace_count (vm, node);
756 u32 n_rx_packets = 0, n_rx_bytes = 0;
757 u32 *to_next = 0, *buffers;
758 u32 bi0, bi1, bi2, bi3;
761 vlib_buffer_t *b0, *b1, *b2, *b3;
762 u32 thread_index = vm->thread_index;
763 memif_per_thread_data_t *ptd = vec_elt_at_index (mm->per_thread_data,
765 u16 cur_slot, last_slot, ring_size, n_slots, mask, head;
771 mq = vec_elt_at_index (mif->rx_queues, qid);
773 ring_size = 1 << mq->log2_ring_size;
774 mask = ring_size - 1;
776 next_index = (mode == MEMIF_INTERFACE_MODE_IP) ?
777 VNET_DEVICE_INPUT_NEXT_IP6_INPUT : VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
779 /* asume that somebody will want to add ethernet header on the packet
780 so start with IP header at offset 14 */
781 start_offset = (mode == MEMIF_INTERFACE_MODE_IP) ? 14 : 0;
782 buffer_length = vlib_buffer_get_default_data_size (vm) - start_offset;
784 cur_slot = mq->last_tail;
785 last_slot = __atomic_load_n (&ring->tail, __ATOMIC_ACQUIRE);
786 if (cur_slot == last_slot)
788 n_slots = last_slot - cur_slot;
790 /* process ring slots */
791 vec_validate_aligned (ptd->buffers, MEMIF_RX_VECTOR_SZ,
792 CLIB_CACHE_LINE_BYTES);
793 while (n_slots && n_rx_packets < MEMIF_RX_VECTOR_SZ)
797 s0 = cur_slot & mask;
798 bi0 = mq->buffers[s0];
799 ptd->buffers[n_rx_packets++] = bi0;
801 clib_prefetch_load (&ring->desc[(cur_slot + 8) & mask]);
802 d0 = &ring->desc[s0];
803 hb = b0 = vlib_get_buffer (vm, bi0);
804 b0->current_data = start_offset;
805 b0->current_length = d0->length;
806 n_rx_bytes += d0->length;
810 if (PREDICT_FALSE ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots))
812 hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
813 hb->total_length_not_including_first_buffer = 0;
815 s0 = cur_slot & mask;
816 d0 = &ring->desc[s0];
817 bi0 = mq->buffers[s0];
819 /* previous buffer */
820 b0->next_buffer = bi0;
821 b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
824 b0 = vlib_get_buffer (vm, bi0);
825 b0->current_data = start_offset;
826 b0->current_length = d0->length;
827 hb->total_length_not_including_first_buffer += d0->length;
828 n_rx_bytes += d0->length;
832 if ((d0->flags & MEMIF_DESC_FLAG_NEXT) && n_slots)
837 /* release slots from the ring */
838 mq->last_tail = cur_slot;
840 n_from = n_rx_packets;
841 buffers = ptd->buffers;
846 u32 next0, next1, next2, next3;
848 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
849 while (n_from >= 8 && n_left_to_next >= 4)
851 b0 = vlib_get_buffer (vm, buffers[4]);
852 b1 = vlib_get_buffer (vm, buffers[5]);
853 b2 = vlib_get_buffer (vm, buffers[6]);
854 b3 = vlib_get_buffer (vm, buffers[7]);
855 vlib_prefetch_buffer_header (b0, STORE);
856 vlib_prefetch_buffer_header (b1, STORE);
857 vlib_prefetch_buffer_header (b2, STORE);
858 vlib_prefetch_buffer_header (b3, STORE);
861 to_next[0] = bi0 = buffers[0];
862 to_next[1] = bi1 = buffers[1];
863 to_next[2] = bi2 = buffers[2];
864 to_next[3] = bi3 = buffers[3];
869 b0 = vlib_get_buffer (vm, bi0);
870 b1 = vlib_get_buffer (vm, bi1);
871 b2 = vlib_get_buffer (vm, bi2);
872 b3 = vlib_get_buffer (vm, bi3);
874 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
875 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
876 vnet_buffer (b1)->sw_if_index[VLIB_RX] = mif->sw_if_index;
877 vnet_buffer (b1)->sw_if_index[VLIB_TX] = ~0;
878 vnet_buffer (b2)->sw_if_index[VLIB_RX] = mif->sw_if_index;
879 vnet_buffer (b2)->sw_if_index[VLIB_TX] = ~0;
880 vnet_buffer (b3)->sw_if_index[VLIB_RX] = mif->sw_if_index;
881 vnet_buffer (b3)->sw_if_index[VLIB_TX] = ~0;
883 if (mode == MEMIF_INTERFACE_MODE_IP)
885 next0 = memif_next_from_ip_hdr (node, b0);
886 next1 = memif_next_from_ip_hdr (node, b1);
887 next2 = memif_next_from_ip_hdr (node, b2);
888 next3 = memif_next_from_ip_hdr (node, b3);
890 else if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
892 if (PREDICT_FALSE (mif->per_interface_next_index != ~0))
894 next0 = mif->per_interface_next_index;
895 next1 = mif->per_interface_next_index;
896 next2 = mif->per_interface_next_index;
897 next3 = mif->per_interface_next_index;
901 next0 = next1 = next2 = next3 = next_index;
902 /* redirect if feature path enabled */
903 vnet_feature_start_device_input_x1 (mif->sw_if_index,
905 vnet_feature_start_device_input_x1 (mif->sw_if_index,
907 vnet_feature_start_device_input_x1 (mif->sw_if_index,
909 vnet_feature_start_device_input_x1 (mif->sw_if_index,
915 if (PREDICT_FALSE (n_trace > 0))
917 memif_trace_buffer (vm, node, mif, b0, next0, qid, &n_trace);
918 if (PREDICT_FALSE (n_trace > 0))
919 memif_trace_buffer (vm, node, mif, b1, next1, qid, &n_trace);
920 if (PREDICT_FALSE (n_trace > 0))
921 memif_trace_buffer (vm, node, mif, b2, next2, qid, &n_trace);
922 if (PREDICT_FALSE (n_trace > 0))
923 memif_trace_buffer (vm, node, mif, b3, next3, qid, &n_trace);
927 vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next,
928 n_left_to_next, bi0, bi1, bi2, bi3,
929 next0, next1, next2, next3);
934 while (n_from && n_left_to_next)
937 to_next[0] = bi0 = buffers[0];
942 b0 = vlib_get_buffer (vm, bi0);
943 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
944 vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
946 if (mode == MEMIF_INTERFACE_MODE_IP)
948 next0 = memif_next_from_ip_hdr (node, b0);
950 else if (mode == MEMIF_INTERFACE_MODE_ETHERNET)
952 if (PREDICT_FALSE (mif->per_interface_next_index != ~0))
953 next0 = mif->per_interface_next_index;
957 /* redirect if feature path enabled */
958 vnet_feature_start_device_input_x1 (mif->sw_if_index,
964 if (PREDICT_FALSE (n_trace > 0))
965 memif_trace_buffer (vm, node, mif, b0, next0, qid, &n_trace);
968 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
969 n_left_to_next, bi0, next0);
974 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
977 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
978 + VNET_INTERFACE_COUNTER_RX, thread_index,
979 mif->sw_if_index, n_rx_packets,
982 /* refill ring with empty buffers */
984 vec_reset_length (ptd->buffers);
987 n_slots = ring_size - head + mq->last_tail;
995 memif_desc_t desc_template, *dt = &desc_template;
996 clib_memset (dt, 0, sizeof (memif_desc_t));
997 dt->length = buffer_length;
999 n_alloc = vlib_buffer_alloc_to_ring_from_pool (
1000 vm, mq->buffers, slot, ring_size, n_slots, mq->buffer_pool_index);
1001 dt->region = mq->buffer_pool_index + 1;
1002 offset = (u64) mif->regions[dt->region].shm - start_offset;
1004 if (PREDICT_FALSE (n_alloc != n_slots))
1005 vlib_error_count (vm, node->node_index,
1006 MEMIF_INPUT_ERROR_BUFFER_ALLOC_FAIL, 1);
1012 memif_desc_t *d = ring->desc + slot;
1013 u32 *bi = mq->buffers + slot;
1015 if (PREDICT_FALSE (((slot + 7 > mask) || (n_alloc < 8))))
1018 clib_memcpy_fast (d + 0, dt, sizeof (memif_desc_t));
1019 clib_memcpy_fast (d + 1, dt, sizeof (memif_desc_t));
1020 clib_memcpy_fast (d + 2, dt, sizeof (memif_desc_t));
1021 clib_memcpy_fast (d + 3, dt, sizeof (memif_desc_t));
1022 clib_memcpy_fast (d + 4, dt, sizeof (memif_desc_t));
1023 clib_memcpy_fast (d + 5, dt, sizeof (memif_desc_t));
1024 clib_memcpy_fast (d + 6, dt, sizeof (memif_desc_t));
1025 clib_memcpy_fast (d + 7, dt, sizeof (memif_desc_t));
1027 d[0].offset = (u64) vlib_get_buffer (vm, bi[0])->data - offset;
1028 d[1].offset = (u64) vlib_get_buffer (vm, bi[1])->data - offset;
1029 d[2].offset = (u64) vlib_get_buffer (vm, bi[2])->data - offset;
1030 d[3].offset = (u64) vlib_get_buffer (vm, bi[3])->data - offset;
1031 d[4].offset = (u64) vlib_get_buffer (vm, bi[4])->data - offset;
1032 d[5].offset = (u64) vlib_get_buffer (vm, bi[5])->data - offset;
1033 d[6].offset = (u64) vlib_get_buffer (vm, bi[6])->data - offset;
1034 d[7].offset = (u64) vlib_get_buffer (vm, bi[7])->data - offset;
1036 slot = (slot + 8) & mask;
1041 clib_memcpy_fast (d, dt, sizeof (memif_desc_t));
1042 d[0].offset = (u64) vlib_get_buffer (vm, bi[0])->data - offset;
1044 slot = (slot + 1) & mask;
1048 __atomic_store_n (&ring->head, head, __ATOMIC_RELEASE);
1051 return n_rx_packets;
1055 VLIB_NODE_FN (memif_input_node) (vlib_main_t * vm,
1056 vlib_node_runtime_t * node,
1057 vlib_frame_t * frame)
1060 memif_main_t *mm = &memif_main;
1061 memif_interface_mode_t mode_ip = MEMIF_INTERFACE_MODE_IP;
1062 memif_interface_mode_t mode_eth = MEMIF_INTERFACE_MODE_ETHERNET;
1064 vnet_hw_if_rxq_poll_vector_t *pv;
1065 pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
1066 for (int i = 0; i < vec_len (pv); i++)
1070 mif = vec_elt_at_index (mm->interfaces, pv[i].dev_instance);
1071 qid = pv[i].queue_id;
1072 if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) &&
1073 (mif->flags & MEMIF_IF_FLAG_CONNECTED))
1075 if (mif->flags & MEMIF_IF_FLAG_ZERO_COPY)
1077 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
1079 memif_device_input_zc_inline (vm, node, mif, qid, mode_ip);
1082 memif_device_input_zc_inline (vm, node, mif, qid, mode_eth);
1084 else if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
1086 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
1087 n_rx += memif_device_input_inline (
1088 vm, node, mif, MEMIF_RING_M2S, qid, mode_ip);
1090 n_rx += memif_device_input_inline (
1091 vm, node, mif, MEMIF_RING_M2S, qid, mode_eth);
1095 if (mif->mode == MEMIF_INTERFACE_MODE_IP)
1096 n_rx += memif_device_input_inline (
1097 vm, node, mif, MEMIF_RING_S2M, qid, mode_ip);
1099 n_rx += memif_device_input_inline (
1100 vm, node, mif, MEMIF_RING_S2M, qid, mode_eth);
1109 VLIB_REGISTER_NODE (memif_input_node) = {
1110 .name = "memif-input",
1111 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1112 .sibling_of = "device-input",
1113 .format_trace = format_memif_input_trace,
1114 .type = VLIB_NODE_TYPE_INPUT,
1115 .state = VLIB_NODE_STATE_INTERRUPT,
1116 .n_errors = MEMIF_INPUT_N_ERROR,
1117 .error_counters = memif_input_error_counters,
1124 * fd.io coding-style-patch-verification: ON
1127 * eval: (c-set-style "gnu")