2 *------------------------------------------------------------------
5 * Copyright (c) 2014-2018 Cisco and/or its affiliates.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *------------------------------------------------------------------
20 #include <fcntl.h> /* for open */
21 #include <sys/ioctl.h>
22 #include <sys/socket.h>
25 #include <sys/types.h>
26 #include <sys/uio.h> /* for iovec */
27 #include <netinet/in.h>
30 #include <linux/if_arp.h>
31 #include <linux/if_tun.h>
33 #include <vlib/vlib.h>
34 #include <vlib/unix/unix.h>
36 #include <vnet/ip/ip.h>
38 #include <vnet/ethernet/ethernet.h>
39 #include <vnet/devices/devices.h>
40 #include <vnet/feature/feature.h>
42 #include <vnet/devices/virtio/virtio.h>
43 #include <vnet/devices/virtio/vhost_user.h>
44 #include <vnet/devices/virtio/vhost_user_inline.h>
47 * When an RX queue is down but active, received packets
48 * must be discarded. This value controls up to how many
49 * packets will be discarded during each round.
51 #define VHOST_USER_DOWN_DISCARD_COUNT 256
54 * When the number of available buffers gets under this threshold,
55 * RX node will start discarding packets.
57 #define VHOST_USER_RX_BUFFER_STARVATION 32
60 * On the receive side, the host should free descriptors as soon
61 * as possible in order to avoid TX drop in the VM.
62 * This value controls the number of copy operations that are stacked
63 * before copy is done for all and descriptors are given back to
65 * The value 64 was obtained by testing (48 and 128 were not as good).
67 #define VHOST_USER_RX_COPY_THRESHOLD 64
69 extern vlib_node_registration_t vhost_user_input_node;
71 #define foreach_vhost_user_input_func_error \
72 _(NO_ERROR, "no error") \
73 _(NO_BUFFER, "no available buffer") \
74 _(MMAP_FAIL, "mmap failure") \
75 _(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \
76 _(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \
77 _(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)")
81 #define _(f,s) VHOST_USER_INPUT_FUNC_ERROR_##f,
82 foreach_vhost_user_input_func_error
84 VHOST_USER_INPUT_FUNC_N_ERROR,
85 } vhost_user_input_func_error_t;
87 static __clib_unused char *vhost_user_input_func_error_strings[] = {
89 foreach_vhost_user_input_func_error
93 static_always_inline void
94 vhost_user_rx_trace (vhost_trace_t * t,
95 vhost_user_intf_t * vui, u16 qid,
96 vlib_buffer_t * b, vhost_user_vring_t * txvq,
99 vhost_user_main_t *vum = &vhost_user_main;
100 u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask];
101 vring_desc_t *hdr_desc = 0;
102 virtio_net_hdr_mrg_rxbuf_t *hdr;
105 clib_memset (t, 0, sizeof (*t));
106 t->device_index = vui - vum->vhost_user_interfaces;
109 hdr_desc = &txvq->desc[desc_current];
110 if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
112 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
113 /* Header is the first here */
114 hdr_desc = map_guest_mem (vui, txvq->desc[desc_current].addr, &hint);
116 if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT)
118 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
120 if (!(txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) &&
121 !(txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT))
123 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
126 t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
128 if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint)))
130 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR;
134 u32 len = vui->virtio_net_hdr_sz;
135 memcpy (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len);
139 static_always_inline u32
140 vhost_user_input_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy,
141 u16 copy_len, u32 * map_hint)
143 void *src0, *src1, *src2, *src3;
144 if (PREDICT_TRUE (copy_len >= 4))
146 if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[0].src, map_hint))))
148 if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[1].src, map_hint))))
151 while (PREDICT_TRUE (copy_len >= 4))
157 (!(src2 = map_guest_mem (vui, cpy[2].src, map_hint))))
160 (!(src3 = map_guest_mem (vui, cpy[3].src, map_hint))))
163 CLIB_PREFETCH (src2, 64, LOAD);
164 CLIB_PREFETCH (src3, 64, LOAD);
166 clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len);
167 clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len);
174 if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint))))
176 clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len);
184 * Try to discard packets from the tx ring (VPP RX path).
185 * Returns the number of discarded packets.
187 static_always_inline u32
188 vhost_user_rx_discard_packet (vlib_main_t * vm,
189 vhost_user_intf_t * vui,
190 vhost_user_vring_t * txvq, u32 discard_max)
193 * On the RX side, each packet corresponds to one descriptor
194 * (it is the same whether it is a shallow descriptor, chained, or indirect).
195 * Therefore, discarding a packet is like discarding a descriptor.
197 u32 discarded_packets = 0;
198 u32 avail_idx = txvq->avail->idx;
199 u16 mask = txvq->qsz_mask;
200 u16 last_avail_idx = txvq->last_avail_idx;
201 u16 last_used_idx = txvq->last_used_idx;
202 while (discarded_packets != discard_max)
204 if (avail_idx == last_avail_idx)
207 u16 desc_chain_head = txvq->avail->ring[last_avail_idx & mask];
209 txvq->used->ring[last_used_idx & mask].id = desc_chain_head;
210 txvq->used->ring[last_used_idx & mask].len = 0;
211 vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
217 txvq->last_avail_idx = last_avail_idx;
218 txvq->last_used_idx = last_used_idx;
219 CLIB_MEMORY_STORE_BARRIER ();
220 txvq->used->idx = txvq->last_used_idx;
221 vhost_user_log_dirty_ring (vui, txvq, idx);
222 return discarded_packets;
226 * In case of overflow, we need to rewind the array of allocated buffers.
228 static_always_inline void
229 vhost_user_input_rewind_buffers (vlib_main_t * vm,
230 vhost_cpu_t * cpu, vlib_buffer_t * b_head)
232 u32 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
233 vlib_buffer_t *b_current = vlib_get_buffer (vm, bi_current);
234 b_current->current_length = 0;
235 b_current->flags = 0;
236 while (b_current != b_head)
238 cpu->rx_buffers_len++;
239 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
240 b_current = vlib_get_buffer (vm, bi_current);
241 b_current->current_length = 0;
242 b_current->flags = 0;
244 cpu->rx_buffers_len++;
247 static_always_inline void
248 vhost_user_handle_rx_offload (vlib_buffer_t * b0, u8 * b0_data,
249 virtio_net_hdr_t * hdr)
253 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
256 ethernet_header_t *eh = (ethernet_header_t *) b0_data;
257 u16 ethertype = clib_net_to_host_u16 (eh->type);
258 u16 l2hdr_sz = sizeof (ethernet_header_t);
260 if (ethernet_frame_is_tagged (ethertype))
262 ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
264 ethertype = clib_net_to_host_u16 (vlan->type);
265 l2hdr_sz += sizeof (*vlan);
266 if (ethertype == ETHERNET_TYPE_VLAN)
269 ethertype = clib_net_to_host_u16 (vlan->type);
270 l2hdr_sz += sizeof (*vlan);
273 vnet_buffer (b0)->l2_hdr_offset = 0;
274 vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
275 vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start;
276 b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
277 VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
278 VNET_BUFFER_F_L4_HDR_OFFSET_VALID |
279 VNET_BUFFER_F_OFFLOAD_IP_CKSUM);
281 if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
283 ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz);
284 l4_proto = ip4->protocol;
285 b0->flags |= VNET_BUFFER_F_IS_IP4;
287 else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
289 ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz);
290 l4_proto = ip6->protocol;
291 b0->flags |= VNET_BUFFER_F_IS_IP6;
294 if (l4_proto == IP_PROTOCOL_TCP)
296 tcp_header_t *tcp = (tcp_header_t *)
297 (b0_data + vnet_buffer (b0)->l4_hdr_offset);
298 l4_hdr_sz = tcp_header_bytes (tcp);
300 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
302 else if (l4_proto == IP_PROTOCOL_UDP)
305 (udp_header_t *) (b0_data + vnet_buffer (b0)->l4_hdr_offset);
306 l4_hdr_sz = sizeof (*udp);
308 b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
312 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP)
314 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
315 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
316 b0->flags |= VNET_BUFFER_F_GSO;
318 else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
320 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
321 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
322 b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4);
324 else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
326 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
327 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
328 b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6);
332 static_always_inline u32
333 vhost_user_if_input (vlib_main_t * vm,
334 vhost_user_main_t * vum,
335 vhost_user_intf_t * vui,
336 u16 qid, vlib_node_runtime_t * node,
337 vnet_hw_interface_rx_mode mode, u8 enable_csum)
339 vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
340 vnet_feature_main_t *fm = &feature_main;
341 u16 n_rx_packets = 0;
344 u32 n_left_to_next, *to_next;
345 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
346 u32 n_trace = vlib_get_trace_count (vm, node);
347 u32 buffer_data_size = vlib_buffer_get_default_data_size (vm);
349 vhost_cpu_t *cpu = &vum->cpus[vm->thread_index];
351 u8 feature_arc_idx = fm->device_input_feature_arc_index;
352 u32 current_config_index = ~(u32) 0;
353 u16 mask = txvq->qsz_mask;
355 /* The descriptor table is not ready yet */
356 if (PREDICT_FALSE (txvq->avail == 0))
360 /* do we have pending interrupts ? */
361 vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
362 f64 now = vlib_time_now (vm);
364 if ((txvq->n_since_last_int) && (txvq->int_deadline < now))
365 vhost_user_send_call (vm, txvq);
367 if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now))
368 vhost_user_send_call (vm, rxvq);
372 * For adaptive mode, it is optimized to reduce interrupts.
373 * If the scheduler switches the input node to polling due
374 * to burst of traffic, we tell the driver no interrupt.
375 * When the traffic subsides, the scheduler switches the node back to
376 * interrupt mode. We must tell the driver we want interrupt.
378 if (PREDICT_FALSE (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE))
381 VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
383 VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
384 /* Tell driver we want notification */
385 txvq->used->flags = 0;
387 /* Tell driver we don't want notification */
388 txvq->used->flags = VRING_USED_F_NO_NOTIFY;
391 if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE))
394 n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx);
397 if (PREDICT_FALSE (n_left == 0))
400 if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled)))
403 * Discard input packet if interface is admin down or vring is not
405 * "For example, for a networking device, in the disabled state
406 * client must not supply any new RX packets, but must process
407 * and discard any TX packets."
409 vhost_user_rx_discard_packet (vm, vui, txvq,
410 VHOST_USER_DOWN_DISCARD_COUNT);
414 if (PREDICT_FALSE (n_left == (mask + 1)))
417 * Informational error logging when VPP is not
418 * receiving packets fast enough.
420 vlib_error_count (vm, node->node_index,
421 VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1);
424 if (n_left > VLIB_FRAME_SIZE)
425 n_left = VLIB_FRAME_SIZE;
428 * For small packets (<2kB), we will not need more than one vlib buffer
429 * per packet. In case packets are bigger, we will just yield at some point
430 * in the loop and come back later. This is not an issue as for big packet,
431 * processing cost really comes from the memory copy.
432 * The assumption is that big packets will fit in 40 buffers.
434 if (PREDICT_FALSE (cpu->rx_buffers_len < n_left + 1 ||
435 cpu->rx_buffers_len < 40))
437 u32 curr_len = cpu->rx_buffers_len;
438 cpu->rx_buffers_len +=
439 vlib_buffer_alloc (vm, cpu->rx_buffers + curr_len,
440 VHOST_USER_RX_BUFFERS_N - curr_len);
443 (cpu->rx_buffers_len < VHOST_USER_RX_BUFFER_STARVATION))
445 /* In case of buffer starvation, discard some packets from the queue
447 * We keep doing best effort for the remaining packets. */
448 u32 flush = (n_left + 1 > cpu->rx_buffers_len) ?
449 n_left + 1 - cpu->rx_buffers_len : 1;
450 flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush);
453 vlib_increment_simple_counter (vnet_main.
454 interface_main.sw_if_counters +
455 VNET_INTERFACE_COUNTER_DROP,
456 vm->thread_index, vui->sw_if_index,
459 vlib_error_count (vm, vhost_user_input_node.index,
460 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush);
464 if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index)))
466 vnet_feature_config_main_t *cm;
467 cm = &fm->feature_config_mains[feature_arc_idx];
468 current_config_index = vec_elt (cm->config_index_by_sw_if_index,
470 vnet_get_config_data (&cm->config_main, ¤t_config_index,
474 u16 last_avail_idx = txvq->last_avail_idx;
475 u16 last_used_idx = txvq->last_used_idx;
477 vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
479 if (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT)
481 /* give some hints to ethernet-input */
482 vlib_next_frame_t *nf;
484 ethernet_input_frame_t *ef;
485 nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
486 f = vlib_get_frame (vm, nf->frame);
487 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
489 ef = vlib_frame_scalar_args (f);
490 ef->sw_if_index = vui->sw_if_index;
491 ef->hw_if_index = vui->hw_if_index;
492 vlib_frame_no_append (f);
497 vlib_buffer_t *b_head, *b_current;
500 u32 desc_data_offset;
501 vring_desc_t *desc_table = txvq->desc;
503 if (PREDICT_FALSE (cpu->rx_buffers_len <= 1))
505 /* Not enough rx_buffers
506 * Note: We yeld on 1 so we don't need to do an additional
507 * check for the next buffer prefetch.
513 desc_current = txvq->avail->ring[last_avail_idx & mask];
514 cpu->rx_buffers_len--;
515 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
516 b_head = b_current = vlib_get_buffer (vm, bi_current);
517 to_next[0] = bi_current; //We do that now so we can forget about bi_current
521 vlib_prefetch_buffer_with_index
522 (vm, cpu->rx_buffers[cpu->rx_buffers_len - 1], LOAD);
524 /* Just preset the used descriptor id and length for later */
525 txvq->used->ring[last_used_idx & mask].id = desc_current;
526 txvq->used->ring[last_used_idx & mask].len = 0;
527 vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
529 /* The buffer should already be initialized */
530 b_head->total_length_not_including_first_buffer = 0;
531 b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
533 if (PREDICT_FALSE (n_trace))
535 vlib_trace_buffer (vm, node, next_index, b_head,
536 /* follow_chain */ 0);
538 vlib_add_trace (vm, node, b_head, sizeof (t0[0]));
539 vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx);
541 vlib_set_trace_count (vm, node, n_trace);
544 /* This depends on the setup but is very consistent
545 * So I think the CPU branch predictor will make a pretty good job
546 * at optimizing the decision. */
548 if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
550 desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr,
554 if (PREDICT_FALSE (desc_table == 0))
556 vlib_error_count (vm, node->node_index,
557 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
562 if (PREDICT_TRUE (vui->is_any_layout) ||
563 (!(desc_table[desc_current].flags & VIRTQ_DESC_F_NEXT)))
565 /* ANYLAYOUT or single buffer */
566 desc_data_offset = vui->virtio_net_hdr_sz;
570 /* CSR case without ANYLAYOUT, skip 1st buffer */
571 desc_data_offset = desc_table[desc_current].len;
576 virtio_net_hdr_mrg_rxbuf_t *hdr;
578 u16 current = desc_current;
579 u32 data_offset = desc_data_offset;
581 if ((data_offset == desc_table[current].len) &&
582 (desc_table[current].flags & VIRTQ_DESC_F_NEXT))
584 current = desc_table[current].next;
587 hdr = map_guest_mem (vui, desc_table[current].addr, &map_hint);
588 if (PREDICT_FALSE (hdr == 0))
590 vlib_error_count (vm, node->node_index,
591 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
594 b_data = (u8 *) hdr + data_offset;
597 hdr = map_guest_mem (vui, desc_table[desc_current].addr,
599 if (PREDICT_FALSE (hdr == 0))
601 vlib_error_count (vm, node->node_index,
602 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
606 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
611 /* Get more input if necessary. Or end of packet. */
612 if (desc_data_offset == desc_table[desc_current].len)
614 if (PREDICT_FALSE (desc_table[desc_current].flags &
617 desc_current = desc_table[desc_current].next;
618 desc_data_offset = 0;
626 /* Get more output if necessary. Or end of packet. */
627 if (PREDICT_FALSE (b_current->current_length == buffer_data_size))
629 if (PREDICT_FALSE (cpu->rx_buffers_len == 0))
631 /* Cancel speculation */
636 * Checking if there are some left buffers.
637 * If not, just rewind the used buffers and stop.
638 * Note: Scheduled copies are not cancelled. This is
639 * not an issue as they would still be valid. Useless,
642 vhost_user_input_rewind_buffers (vm, cpu, b_head);
647 /* Get next output */
648 cpu->rx_buffers_len--;
649 u32 bi_next = cpu->rx_buffers[cpu->rx_buffers_len];
650 b_current->next_buffer = bi_next;
651 b_current->flags |= VLIB_BUFFER_NEXT_PRESENT;
652 bi_current = bi_next;
653 b_current = vlib_get_buffer (vm, bi_current);
656 /* Prepare a copy order executed later for the data */
657 ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
658 vhost_copy_t *cpy = &cpu->copy[copy_len];
660 u32 desc_data_l = desc_table[desc_current].len - desc_data_offset;
661 cpy->len = buffer_data_size - b_current->current_length;
662 cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len;
663 cpy->dst = (uword) (vlib_buffer_get_current (b_current) +
664 b_current->current_length);
665 cpy->src = desc_table[desc_current].addr + desc_data_offset;
667 desc_data_offset += cpy->len;
669 b_current->current_length += cpy->len;
670 b_head->total_length_not_including_first_buffer += cpy->len;
675 n_rx_bytes += b_head->total_length_not_including_first_buffer;
678 b_head->total_length_not_including_first_buffer -=
679 b_head->current_length;
681 /* consume the descriptor and return it as used */
685 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
687 vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index;
688 vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0;
691 if (current_config_index != ~(u32) 0)
693 b_head->current_config_index = current_config_index;
694 vnet_buffer (b_head)->feature_arc_index = feature_arc_idx;
700 * Although separating memory copies from virtio ring parsing
701 * is beneficial, we can offer to perform the copies from time
702 * to time in order to free some space in the ring.
704 if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD))
706 if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy,
707 copy_len, &map_hint)))
709 vlib_error_count (vm, node->node_index,
710 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
714 /* give buffers back to driver */
715 CLIB_MEMORY_STORE_BARRIER ();
716 txvq->used->idx = last_used_idx;
717 vhost_user_log_dirty_ring (vui, txvq, idx);
721 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
723 txvq->last_used_idx = last_used_idx;
724 txvq->last_avail_idx = last_avail_idx;
726 /* Do the memory copies */
727 if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len,
730 vlib_error_count (vm, node->node_index,
731 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
734 /* give buffers back to driver */
735 CLIB_MEMORY_STORE_BARRIER ();
736 txvq->used->idx = txvq->last_used_idx;
737 vhost_user_log_dirty_ring (vui, txvq, idx);
739 /* interrupt (call) handling */
740 if ((txvq->callfd_idx != ~0) &&
741 !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
743 txvq->n_since_last_int += n_rx_packets;
745 if (txvq->n_since_last_int > vum->coalesce_frames)
746 vhost_user_send_call (vm, txvq);
749 /* increase rx counters */
750 vlib_increment_combined_counter
751 (vnet_main.interface_main.combined_sw_if_counters
752 + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index,
753 n_rx_packets, n_rx_bytes);
755 vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
761 VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm,
762 vlib_node_runtime_t * node,
763 vlib_frame_t * frame)
765 vhost_user_main_t *vum = &vhost_user_main;
766 uword n_rx_packets = 0;
767 vhost_user_intf_t *vui;
768 vnet_device_input_runtime_t *rt =
769 (vnet_device_input_runtime_t *) node->runtime_data;
770 vnet_device_and_queue_t *dq;
772 vec_foreach (dq, rt->devices_and_queues)
774 if ((node->state == VLIB_NODE_STATE_POLLING) ||
775 clib_atomic_swap_acq_n (&dq->interrupt_pending, 0))
778 pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance);
779 if (vui->features & (1ULL << FEAT_VIRTIO_NET_F_CSUM))
781 vhost_user_if_input (vm, vum, vui, dq->queue_id, node, dq->mode,
785 vhost_user_if_input (vm, vum, vui, dq->queue_id, node, dq->mode,
794 VLIB_REGISTER_NODE (vhost_user_input_node) = {
795 .type = VLIB_NODE_TYPE_INPUT,
796 .name = "vhost-user-input",
797 .sibling_of = "device-input",
798 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
800 /* Will be enabled if/when hardware is detected. */
801 .state = VLIB_NODE_STATE_DISABLED,
803 .format_buffer = format_ethernet_header_with_length,
804 .format_trace = format_vhost_trace,
806 .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR,
807 .error_strings = vhost_user_input_func_error_strings,
812 * fd.io coding-style-patch-verification: ON
815 * eval: (c-set-style "gnu")