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/vhost_user.h>
43 #include <vnet/devices/virtio/vhost_user_inline.h>
46 * When an RX queue is down but active, received packets
47 * must be discarded. This value controls up to how many
48 * packets will be discarded during each round.
50 #define VHOST_USER_DOWN_DISCARD_COUNT 256
53 * When the number of available buffers gets under this threshold,
54 * RX node will start discarding packets.
56 #define VHOST_USER_RX_BUFFER_STARVATION 32
59 * On the receive side, the host should free descriptors as soon
60 * as possible in order to avoid TX drop in the VM.
61 * This value controls the number of copy operations that are stacked
62 * before copy is done for all and descriptors are given back to
64 * The value 64 was obtained by testing (48 and 128 were not as good).
66 #define VHOST_USER_RX_COPY_THRESHOLD 64
68 extern vlib_node_registration_t vhost_user_input_node;
70 #define foreach_vhost_user_input_func_error \
71 _(NO_ERROR, "no error") \
72 _(NO_BUFFER, "no available buffer") \
73 _(MMAP_FAIL, "mmap failure") \
74 _(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \
75 _(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \
76 _(NOT_READY, "vhost interface not ready or down") \
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 & VRING_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 & VRING_DESC_F_NEXT)
118 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
120 if (!(txvq->desc[desc_current].flags & VRING_DESC_F_NEXT) &&
121 !(txvq->desc[desc_current].flags & VRING_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 ethernet_header_t *eh = (ethernet_header_t *) b0_data;
254 u16 ethertype = clib_net_to_host_u16 (eh->type);
255 u16 l2hdr_sz = sizeof (ethernet_header_t);
257 if (ethernet_frame_is_tagged (ethertype))
259 ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
261 ethertype = clib_net_to_host_u16 (vlan->type);
262 l2hdr_sz += sizeof (*vlan);
263 if (ethertype == ETHERNET_TYPE_VLAN)
266 ethertype = clib_net_to_host_u16 (vlan->type);
267 l2hdr_sz += sizeof (*vlan);
270 vnet_buffer (b0)->l2_hdr_offset = 0;
271 vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
272 vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start;
273 b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
274 VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
275 VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
277 if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
279 ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz);
280 l4_proto = ip4->protocol;
281 b0->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
283 else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
285 ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz);
286 l4_proto = ip6->protocol;
287 b0->flags |= VNET_BUFFER_F_IS_IP6;
290 if (l4_proto == IP_PROTOCOL_TCP)
292 tcp_header_t *tcp = (tcp_header_t *)
293 (b0_data + vnet_buffer (b0)->l4_hdr_offset);
294 l4_hdr_sz = tcp_header_bytes (tcp);
296 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
298 else if (l4_proto == IP_PROTOCOL_UDP)
301 (udp_header_t *) (b0_data + vnet_buffer (b0)->l4_hdr_offset);
302 l4_hdr_sz = sizeof (*udp);
304 b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
307 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP)
309 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
310 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
311 b0->flags |= VNET_BUFFER_F_GSO;
313 else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
315 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
316 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
317 b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4);
319 else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
321 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
322 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
323 b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6);
327 static_always_inline void
328 vhost_user_input_do_interrupt (vlib_main_t * vm, vhost_user_vring_t * txvq,
329 vhost_user_vring_t * rxvq)
331 f64 now = vlib_time_now (vm);
333 if ((txvq->n_since_last_int) && (txvq->int_deadline < now))
334 vhost_user_send_call (vm, txvq);
336 if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now))
337 vhost_user_send_call (vm, rxvq);
340 static_always_inline void
341 vhost_user_input_setup_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
342 vhost_user_intf_t * vui,
343 u32 * current_config_index, u32 * next_index,
344 u32 ** to_next, u32 * n_left_to_next)
346 vnet_feature_main_t *fm = &feature_main;
347 u8 feature_arc_idx = fm->device_input_feature_arc_index;
349 if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index)))
351 vnet_feature_config_main_t *cm;
352 cm = &fm->feature_config_mains[feature_arc_idx];
353 *current_config_index = vec_elt (cm->config_index_by_sw_if_index,
355 vnet_get_config_data (&cm->config_main, current_config_index,
359 vlib_get_new_next_frame (vm, node, *next_index, *to_next, *n_left_to_next);
361 if (*next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT)
363 /* give some hints to 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 = vui->sw_if_index;
373 ef->hw_if_index = vui->hw_if_index;
374 vlib_frame_no_append (f);
378 static_always_inline u32
379 vhost_user_if_input (vlib_main_t * vm,
380 vhost_user_main_t * vum,
381 vhost_user_intf_t * vui,
382 u16 qid, vlib_node_runtime_t * node,
383 vnet_hw_if_rx_mode mode, u8 enable_csum)
385 vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
386 vnet_feature_main_t *fm = &feature_main;
387 u16 n_rx_packets = 0;
390 u32 n_left_to_next, *to_next;
391 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
392 u32 n_trace = vlib_get_trace_count (vm, node);
393 u32 buffer_data_size = vlib_buffer_get_default_data_size (vm);
395 vhost_cpu_t *cpu = &vum->cpus[vm->thread_index];
397 u8 feature_arc_idx = fm->device_input_feature_arc_index;
398 u32 current_config_index = ~(u32) 0;
399 u16 mask = txvq->qsz_mask;
401 /* The descriptor table is not ready yet */
402 if (PREDICT_FALSE (txvq->avail == 0))
406 /* do we have pending interrupts ? */
407 vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
408 vhost_user_input_do_interrupt (vm, txvq, rxvq);
412 * For adaptive mode, it is optimized to reduce interrupts.
413 * If the scheduler switches the input node to polling due
414 * to burst of traffic, we tell the driver no interrupt.
415 * When the traffic subsides, the scheduler switches the node back to
416 * interrupt mode. We must tell the driver we want interrupt.
418 if (PREDICT_FALSE (mode == VNET_HW_IF_RX_MODE_ADAPTIVE))
421 VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
423 VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
424 /* Tell driver we want notification */
425 txvq->used->flags = 0;
427 /* Tell driver we don't want notification */
428 txvq->used->flags = VRING_USED_F_NO_NOTIFY;
431 if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE))
434 n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx);
437 if (PREDICT_FALSE (n_left == 0))
440 if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled)))
443 * Discard input packet if interface is admin down or vring is not
445 * "For example, for a networking device, in the disabled state
446 * client must not supply any new RX packets, but must process
447 * and discard any TX packets."
449 vhost_user_rx_discard_packet (vm, vui, txvq,
450 VHOST_USER_DOWN_DISCARD_COUNT);
454 if (PREDICT_FALSE (n_left == (mask + 1)))
457 * Informational error logging when VPP is not
458 * receiving packets fast enough.
460 vlib_error_count (vm, node->node_index,
461 VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1);
464 if (n_left > VLIB_FRAME_SIZE)
465 n_left = VLIB_FRAME_SIZE;
468 * For small packets (<2kB), we will not need more than one vlib buffer
469 * per packet. In case packets are bigger, we will just yield at some point
470 * in the loop and come back later. This is not an issue as for big packet,
471 * processing cost really comes from the memory copy.
472 * The assumption is that big packets will fit in 40 buffers.
474 if (PREDICT_FALSE (cpu->rx_buffers_len < n_left + 1 ||
475 cpu->rx_buffers_len < 40))
477 u32 curr_len = cpu->rx_buffers_len;
478 cpu->rx_buffers_len +=
479 vlib_buffer_alloc (vm, cpu->rx_buffers + curr_len,
480 VHOST_USER_RX_BUFFERS_N - curr_len);
483 (cpu->rx_buffers_len < VHOST_USER_RX_BUFFER_STARVATION))
485 /* In case of buffer starvation, discard some packets from the queue
487 * We keep doing best effort for the remaining packets. */
488 u32 flush = (n_left + 1 > cpu->rx_buffers_len) ?
489 n_left + 1 - cpu->rx_buffers_len : 1;
490 flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush);
493 vlib_increment_simple_counter (vnet_main.
494 interface_main.sw_if_counters +
495 VNET_INTERFACE_COUNTER_DROP,
496 vm->thread_index, vui->sw_if_index,
499 vlib_error_count (vm, vhost_user_input_node.index,
500 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush);
504 vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index,
505 &next_index, &to_next, &n_left_to_next);
507 u16 last_avail_idx = txvq->last_avail_idx;
508 u16 last_used_idx = txvq->last_used_idx;
512 vlib_buffer_t *b_head, *b_current;
515 u32 desc_data_offset;
516 vring_desc_t *desc_table = txvq->desc;
518 if (PREDICT_FALSE (cpu->rx_buffers_len <= 1))
520 /* Not enough rx_buffers
521 * Note: We yeld on 1 so we don't need to do an additional
522 * check for the next buffer prefetch.
528 desc_current = txvq->avail->ring[last_avail_idx & mask];
529 cpu->rx_buffers_len--;
530 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
531 b_head = b_current = vlib_get_buffer (vm, bi_current);
532 to_next[0] = bi_current; //We do that now so we can forget about bi_current
536 vlib_prefetch_buffer_with_index
537 (vm, cpu->rx_buffers[cpu->rx_buffers_len - 1], LOAD);
539 /* Just preset the used descriptor id and length for later */
540 txvq->used->ring[last_used_idx & mask].id = desc_current;
541 txvq->used->ring[last_used_idx & mask].len = 0;
542 vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
544 /* The buffer should already be initialized */
545 b_head->total_length_not_including_first_buffer = 0;
546 b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
548 if (PREDICT_FALSE (n_trace))
550 vlib_trace_buffer (vm, node, next_index, b_head,
551 /* follow_chain */ 0);
553 vlib_add_trace (vm, node, b_head, sizeof (t0[0]));
554 vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx);
556 vlib_set_trace_count (vm, node, n_trace);
559 /* This depends on the setup but is very consistent
560 * So I think the CPU branch predictor will make a pretty good job
561 * at optimizing the decision. */
562 if (txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT)
564 desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr,
567 if (PREDICT_FALSE (desc_table == 0))
569 vlib_error_count (vm, node->node_index,
570 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
575 desc_data_offset = vui->virtio_net_hdr_sz;
579 virtio_net_hdr_mrg_rxbuf_t *hdr;
583 hdr = map_guest_mem (vui, desc_table[desc_current].addr, &map_hint);
584 if (PREDICT_FALSE (hdr == 0))
586 vlib_error_count (vm, node->node_index,
587 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
590 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
592 if ((desc_data_offset == desc_table[desc_current].len) &&
593 (desc_table[desc_current].flags & VRING_DESC_F_NEXT))
595 current = desc_table[desc_current].next;
596 b_data = map_guest_mem (vui, desc_table[current].addr,
598 if (PREDICT_FALSE (b_data == 0))
600 vlib_error_count (vm, node->node_index,
601 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL,
607 b_data = (u8 *) hdr + desc_data_offset;
609 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
615 /* Get more input if necessary. Or end of packet. */
616 if (desc_data_offset == desc_table[desc_current].len)
618 if (PREDICT_FALSE (desc_table[desc_current].flags &
621 desc_current = desc_table[desc_current].next;
622 desc_data_offset = 0;
630 /* Get more output if necessary. Or end of packet. */
631 if (PREDICT_FALSE (b_current->current_length == buffer_data_size))
633 if (PREDICT_FALSE (cpu->rx_buffers_len == 0))
635 /* Cancel speculation */
640 * Checking if there are some left buffers.
641 * If not, just rewind the used buffers and stop.
642 * Note: Scheduled copies are not cancelled. This is
643 * not an issue as they would still be valid. Useless,
646 vhost_user_input_rewind_buffers (vm, cpu, b_head);
651 /* Get next output */
652 cpu->rx_buffers_len--;
653 u32 bi_next = cpu->rx_buffers[cpu->rx_buffers_len];
654 b_current->next_buffer = bi_next;
655 b_current->flags |= VLIB_BUFFER_NEXT_PRESENT;
656 bi_current = bi_next;
657 b_current = vlib_get_buffer (vm, bi_current);
660 /* Prepare a copy order executed later for the data */
661 ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
662 vhost_copy_t *cpy = &cpu->copy[copy_len];
664 u32 desc_data_l = desc_table[desc_current].len - desc_data_offset;
665 cpy->len = buffer_data_size - b_current->current_length;
666 cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len;
667 cpy->dst = (uword) (vlib_buffer_get_current (b_current) +
668 b_current->current_length);
669 cpy->src = desc_table[desc_current].addr + desc_data_offset;
671 desc_data_offset += cpy->len;
673 b_current->current_length += cpy->len;
674 b_head->total_length_not_including_first_buffer += cpy->len;
679 n_rx_bytes += b_head->total_length_not_including_first_buffer;
682 b_head->total_length_not_including_first_buffer -=
683 b_head->current_length;
685 /* consume the descriptor and return it as used */
689 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
691 vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index;
692 vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0;
695 if (current_config_index != ~(u32) 0)
697 b_head->current_config_index = current_config_index;
698 vnet_buffer (b_head)->feature_arc_index = feature_arc_idx;
704 * Although separating memory copies from virtio ring parsing
705 * is beneficial, we can offer to perform the copies from time
706 * to time in order to free some space in the ring.
708 if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD))
710 if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy,
711 copy_len, &map_hint)))
713 vlib_error_count (vm, node->node_index,
714 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
718 /* give buffers back to driver */
719 CLIB_MEMORY_STORE_BARRIER ();
720 txvq->used->idx = last_used_idx;
721 vhost_user_log_dirty_ring (vui, txvq, idx);
725 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
727 txvq->last_used_idx = last_used_idx;
728 txvq->last_avail_idx = last_avail_idx;
730 /* Do the memory copies */
731 if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len,
734 vlib_error_count (vm, node->node_index,
735 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
738 /* give buffers back to driver */
739 CLIB_MEMORY_STORE_BARRIER ();
740 txvq->used->idx = txvq->last_used_idx;
741 vhost_user_log_dirty_ring (vui, txvq, idx);
743 /* interrupt (call) handling */
744 if ((txvq->callfd_idx != ~0) &&
745 !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
747 txvq->n_since_last_int += n_rx_packets;
749 if (txvq->n_since_last_int > vum->coalesce_frames)
750 vhost_user_send_call (vm, txvq);
753 /* increase rx counters */
754 vlib_increment_combined_counter
755 (vnet_main.interface_main.combined_sw_if_counters
756 + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index,
757 n_rx_packets, n_rx_bytes);
759 vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
765 static_always_inline void
766 vhost_user_mark_desc_consumed (vhost_user_intf_t * vui,
767 vhost_user_vring_t * txvq, u16 desc_head,
768 u16 n_descs_processed)
770 vring_packed_desc_t *desc_table = txvq->packed_desc;
772 u16 mask = txvq->qsz_mask;
774 for (desc_idx = 0; desc_idx < n_descs_processed; desc_idx++)
776 if (txvq->used_wrap_counter)
777 desc_table[(desc_head + desc_idx) & mask].flags |=
778 (VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
780 desc_table[(desc_head + desc_idx) & mask].flags &=
781 ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
782 vhost_user_advance_last_used_idx (txvq);
786 static_always_inline void
787 vhost_user_rx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui,
788 u16 qid, vhost_user_vring_t * txvq,
791 vhost_user_main_t *vum = &vhost_user_main;
792 vring_packed_desc_t *hdr_desc;
793 virtio_net_hdr_mrg_rxbuf_t *hdr;
796 clib_memset (t, 0, sizeof (*t));
797 t->device_index = vui - vum->vhost_user_interfaces;
800 hdr_desc = &txvq->packed_desc[desc_current];
801 if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT)
803 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
804 /* Header is the first here */
805 hdr_desc = map_guest_mem (vui, txvq->packed_desc[desc_current].addr,
808 if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT)
809 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
811 if (!(txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) &&
812 !(txvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT))
813 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
815 t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
817 if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint)))
818 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR;
821 u32 len = vui->virtio_net_hdr_sz;
822 clib_memcpy_fast (&t->hdr, hdr,
823 len > hdr_desc->len ? hdr_desc->len : len);
827 static_always_inline u32
828 vhost_user_rx_discard_packet_packed (vlib_main_t * vm,
829 vhost_user_intf_t * vui,
830 vhost_user_vring_t * txvq,
833 u32 discarded_packets = 0;
834 u16 mask = txvq->qsz_mask;
835 u16 desc_current, desc_head;
837 desc_head = desc_current = txvq->last_used_idx & mask;
840 * On the RX side, each packet corresponds to one descriptor
841 * (it is the same whether it is a shallow descriptor, chained, or indirect).
842 * Therefore, discarding a packet is like discarding a descriptor.
844 while ((discarded_packets != discard_max) &&
845 vhost_user_packed_desc_available (txvq, desc_current))
847 vhost_user_advance_last_avail_idx (txvq);
849 desc_current = (desc_current + 1) & mask;
852 if (PREDICT_TRUE (discarded_packets))
853 vhost_user_mark_desc_consumed (vui, txvq, desc_head, discarded_packets);
854 return (discarded_packets);
857 static_always_inline u32
858 vhost_user_input_copy_packed (vhost_user_intf_t * vui, vhost_copy_t * cpy,
859 u16 copy_len, u32 * map_hint)
861 void *src0, *src1, *src2, *src3, *src4, *src5, *src6, *src7;
863 u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR;
865 if (PREDICT_TRUE (copy_len >= 8))
867 src4 = map_guest_mem (vui, cpy[0].src, map_hint);
868 src5 = map_guest_mem (vui, cpy[1].src, map_hint);
869 src6 = map_guest_mem (vui, cpy[2].src, map_hint);
870 src7 = map_guest_mem (vui, cpy[3].src, map_hint);
871 bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0);
872 if (PREDICT_FALSE (bad))
874 CLIB_PREFETCH (src4, 64, LOAD);
875 CLIB_PREFETCH (src5, 64, LOAD);
876 CLIB_PREFETCH (src6, 64, LOAD);
877 CLIB_PREFETCH (src7, 64, LOAD);
879 while (PREDICT_TRUE (copy_len >= 8))
886 src4 = map_guest_mem (vui, cpy[4].src, map_hint);
887 src5 = map_guest_mem (vui, cpy[5].src, map_hint);
888 src6 = map_guest_mem (vui, cpy[6].src, map_hint);
889 src7 = map_guest_mem (vui, cpy[7].src, map_hint);
890 bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0);
891 if (PREDICT_FALSE (bad))
894 CLIB_PREFETCH (src4, 64, LOAD);
895 CLIB_PREFETCH (src5, 64, LOAD);
896 CLIB_PREFETCH (src6, 64, LOAD);
897 CLIB_PREFETCH (src7, 64, LOAD);
899 clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len);
900 clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len);
901 clib_memcpy_fast ((void *) cpy[2].dst, src2, cpy[2].len);
902 clib_memcpy_fast ((void *) cpy[3].dst, src3, cpy[3].len);
911 if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint))))
913 rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
916 clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len);
923 static_always_inline u32
924 vhost_user_do_offload (vhost_user_intf_t * vui,
925 vring_packed_desc_t * desc_table, u16 desc_current,
926 u16 mask, vlib_buffer_t * b_head, u32 * map_hint)
928 u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR;
929 virtio_net_hdr_mrg_rxbuf_t *hdr;
931 u32 desc_data_offset = vui->virtio_net_hdr_sz;
933 hdr = map_guest_mem (vui, desc_table[desc_current].addr, map_hint);
934 if (PREDICT_FALSE (hdr == 0))
935 rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
936 else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
938 if (desc_data_offset == desc_table[desc_current].len)
940 desc_current = (desc_current + 1) & mask;
942 map_guest_mem (vui, desc_table[desc_current].addr, map_hint);
943 if (PREDICT_FALSE (b_data == 0))
944 rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
946 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
950 b_data = (u8 *) hdr + desc_data_offset;
951 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
958 static_always_inline u32
959 vhost_user_compute_buffers_required (u32 desc_len, u32 buffer_data_size)
962 u32 buffers_required;
964 if (PREDICT_TRUE (buffer_data_size == 2048))
966 buffers_required = desc_len >> 11;
967 if ((desc_len & 2047) != 0)
969 return (buffers_required);
972 if (desc_len < buffer_data_size)
975 result = div (desc_len, buffer_data_size);
977 buffers_required = result.quot + 1;
979 buffers_required = result.quot;
981 return (buffers_required);
984 static_always_inline u32
985 vhost_user_compute_indirect_desc_len (vhost_user_intf_t * vui,
986 vhost_user_vring_t * txvq,
987 u32 buffer_data_size, u16 desc_current,
990 vring_packed_desc_t *desc_table = txvq->packed_desc;
992 u16 desc_data_offset = vui->virtio_net_hdr_sz;
993 u16 desc_idx = desc_current;
996 n_descs = desc_table[desc_idx].len >> 4;
997 desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, map_hint);
998 if (PREDICT_FALSE (desc_table == 0))
1001 for (desc_idx = 0; desc_idx < n_descs; desc_idx++)
1002 desc_len += desc_table[desc_idx].len;
1004 if (PREDICT_TRUE (desc_len > desc_data_offset))
1005 desc_len -= desc_data_offset;
1007 return vhost_user_compute_buffers_required (desc_len, buffer_data_size);
1010 static_always_inline u32
1011 vhost_user_compute_chained_desc_len (vhost_user_intf_t * vui,
1012 vhost_user_vring_t * txvq,
1013 u32 buffer_data_size, u16 * current,
1016 vring_packed_desc_t *desc_table = txvq->packed_desc;
1018 u16 mask = txvq->qsz_mask;
1020 while (desc_table[*current].flags & VRING_DESC_F_NEXT)
1022 desc_len += desc_table[*current].len;
1024 *current = (*current + 1) & mask;
1025 vhost_user_advance_last_avail_idx (txvq);
1027 desc_len += desc_table[*current].len;
1029 *current = (*current + 1) & mask;
1030 vhost_user_advance_last_avail_idx (txvq);
1032 if (PREDICT_TRUE (desc_len > vui->virtio_net_hdr_sz))
1033 desc_len -= vui->virtio_net_hdr_sz;
1035 return vhost_user_compute_buffers_required (desc_len, buffer_data_size);
1038 static_always_inline void
1039 vhost_user_assemble_packet (vring_packed_desc_t * desc_table,
1040 u16 * desc_idx, vlib_buffer_t * b_head,
1041 vlib_buffer_t ** b_current, u32 ** next,
1042 vlib_buffer_t *** b, u32 * bi_current,
1043 vhost_cpu_t * cpu, u16 * copy_len,
1044 u32 * buffers_used, u32 buffers_required,
1045 u32 * desc_data_offset, u32 buffer_data_size,
1050 while (*desc_data_offset < desc_table[*desc_idx].len)
1052 /* Get more output if necessary. Or end of packet. */
1053 if (PREDICT_FALSE ((*b_current)->current_length == buffer_data_size))
1055 /* Get next output */
1056 u32 bi_next = **next;
1058 (*b_current)->next_buffer = bi_next;
1059 (*b_current)->flags |= VLIB_BUFFER_NEXT_PRESENT;
1060 *bi_current = bi_next;
1064 ASSERT (*buffers_used <= buffers_required);
1067 /* Prepare a copy order executed later for the data */
1068 ASSERT (*copy_len < VHOST_USER_COPY_ARRAY_N);
1069 vhost_copy_t *cpy = &cpu->copy[*copy_len];
1071 desc_data_l = desc_table[*desc_idx].len - *desc_data_offset;
1072 cpy->len = buffer_data_size - (*b_current)->current_length;
1073 cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len;
1074 cpy->dst = (uword) (vlib_buffer_get_current (*b_current) +
1075 (*b_current)->current_length);
1076 cpy->src = desc_table[*desc_idx].addr + *desc_data_offset;
1078 *desc_data_offset += cpy->len;
1080 (*b_current)->current_length += cpy->len;
1081 b_head->total_length_not_including_first_buffer += cpy->len;
1083 *desc_idx = (*desc_idx + 1) & mask;;
1084 *desc_data_offset = 0;
1087 static_always_inline u32
1088 vhost_user_if_input_packed (vlib_main_t * vm, vhost_user_main_t * vum,
1089 vhost_user_intf_t * vui, u16 qid,
1090 vlib_node_runtime_t * node,
1091 vnet_hw_if_rx_mode mode, u8 enable_csum)
1093 vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
1094 vnet_feature_main_t *fm = &feature_main;
1095 u8 feature_arc_idx = fm->device_input_feature_arc_index;
1096 u16 n_rx_packets = 0;
1099 u32 buffers_required = 0;
1100 u32 n_left_to_next, *to_next;
1101 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
1102 u32 n_trace = vlib_get_trace_count (vm, node);
1103 u32 buffer_data_size = vlib_buffer_get_default_data_size (vm);
1105 vhost_cpu_t *cpu = &vum->cpus[vm->thread_index];
1107 u32 current_config_index = ~0;
1108 u16 mask = txvq->qsz_mask;
1109 u16 desc_current, desc_head, last_used_idx;
1110 vring_packed_desc_t *desc_table = 0;
1111 u32 n_descs_processed = 0;
1115 u32 buffers_used = 0;
1116 u16 current, n_descs_to_process;
1118 /* The descriptor table is not ready yet */
1119 if (PREDICT_FALSE (txvq->packed_desc == 0))
1122 /* do we have pending interrupts ? */
1123 vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
1124 vhost_user_input_do_interrupt (vm, txvq, rxvq);
1127 * For adaptive mode, it is optimized to reduce interrupts.
1128 * If the scheduler switches the input node to polling due
1129 * to burst of traffic, we tell the driver no interrupt.
1130 * When the traffic subsides, the scheduler switches the node back to
1131 * interrupt mode. We must tell the driver we want interrupt.
1133 if (PREDICT_FALSE (mode == VNET_HW_IF_RX_MODE_ADAPTIVE))
1136 VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
1138 VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
1139 /* Tell driver we want notification */
1140 txvq->used_event->flags = 0;
1142 /* Tell driver we don't want notification */
1143 txvq->used_event->flags = VRING_EVENT_F_DISABLE;
1146 last_used_idx = txvq->last_used_idx & mask;
1147 desc_head = desc_current = last_used_idx;
1149 if (vhost_user_packed_desc_available (txvq, desc_current) == 0)
1152 if (PREDICT_FALSE (!vui->admin_up || !vui->is_ready || !(txvq->enabled)))
1155 * Discard input packet if interface is admin down or vring is not
1157 * "For example, for a networking device, in the disabled state
1158 * client must not supply any new RX packets, but must process
1159 * and discard any TX packets."
1161 rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq,
1162 VHOST_USER_DOWN_DISCARD_COUNT);
1163 vlib_error_count (vm, vhost_user_input_node.index,
1164 VHOST_USER_INPUT_FUNC_ERROR_NOT_READY, rv);
1168 vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index,
1169 &next_index, &to_next, &n_left_to_next);
1172 * Compute n_left and total buffers needed
1174 desc_table = txvq->packed_desc;
1175 current = desc_current;
1176 while (vhost_user_packed_desc_available (txvq, current) &&
1177 (n_left < VLIB_FRAME_SIZE))
1179 if (desc_table[current].flags & VRING_DESC_F_INDIRECT)
1182 vhost_user_compute_indirect_desc_len (vui, txvq, buffer_data_size,
1183 current, &map_hint);
1185 current = (current + 1) & mask;
1186 vhost_user_advance_last_avail_idx (txvq);
1191 vhost_user_compute_chained_desc_len (vui, txvq, buffer_data_size,
1196 /* Something is broken if we need more than 10000 buffers */
1197 if (PREDICT_FALSE ((buffers_required == 0) || (buffers_required > 10000)))
1199 rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left);
1200 vlib_error_count (vm, vhost_user_input_node.index,
1201 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv);
1205 vec_validate (cpu->to_next_list, buffers_required);
1206 rv = vlib_buffer_alloc (vm, cpu->to_next_list, buffers_required);
1207 if (PREDICT_FALSE (rv != buffers_required))
1209 vlib_buffer_free (vm, cpu->to_next_list, rv);
1210 rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left);
1211 vlib_error_count (vm, vhost_user_input_node.index,
1212 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv);
1216 next = cpu->to_next_list;
1217 vec_validate (cpu->rx_buffers_pdesc, buffers_required);
1218 vlib_get_buffers (vm, next, cpu->rx_buffers_pdesc, buffers_required);
1219 b = cpu->rx_buffers_pdesc;
1220 n_descs_processed = n_left;
1224 vlib_buffer_t *b_head, *b_current;
1226 u32 desc_data_offset;
1227 u16 desc_idx = desc_current;
1230 desc_table = txvq->packed_desc;
1231 to_next[0] = bi_current = next[0];
1232 b_head = b_current = b[0];
1235 ASSERT (buffers_used <= buffers_required);
1240 /* The buffer should already be initialized */
1241 b_head->total_length_not_including_first_buffer = 0;
1242 b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1243 desc_data_offset = vui->virtio_net_hdr_sz;
1244 n_descs_to_process = 1;
1246 if (desc_table[desc_idx].flags & VRING_DESC_F_INDIRECT)
1248 n_descs = desc_table[desc_idx].len >> 4;
1249 desc_table = map_guest_mem (vui, desc_table[desc_idx].addr,
1252 if (PREDICT_FALSE (desc_table == 0) ||
1255 (vhost_user_do_offload
1256 (vui, desc_table, desc_idx, mask, b_head,
1257 &map_hint) != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))))
1259 vlib_error_count (vm, node->node_index,
1260 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
1270 vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
1271 &b_current, &next, &b, &bi_current,
1272 cpu, ©_len, &buffers_used,
1273 buffers_required, &desc_data_offset,
1274 buffer_data_size, mask);
1282 rv = vhost_user_do_offload (vui, desc_table, desc_idx, mask,
1284 if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
1286 vlib_error_count (vm, node->node_index, rv, 1);
1296 * For chained descriptor, we process all chains in a single while
1297 * loop. So count how many descriptors in the chain.
1299 n_descs_to_process = 1;
1300 while (desc_table[desc_idx].flags & VRING_DESC_F_NEXT)
1302 vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
1303 &b_current, &next, &b, &bi_current,
1304 cpu, ©_len, &buffers_used,
1305 buffers_required, &desc_data_offset,
1306 buffer_data_size, mask);
1307 n_descs_to_process++;
1309 vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
1310 &b_current, &next, &b, &bi_current,
1311 cpu, ©_len, &buffers_used,
1312 buffers_required, &desc_data_offset,
1313 buffer_data_size, mask);
1316 n_rx_bytes += b_head->total_length_not_including_first_buffer;
1319 b_head->total_length_not_including_first_buffer -=
1320 b_head->current_length;
1322 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
1324 vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index;
1325 vnet_buffer (b_head)->sw_if_index[VLIB_TX] = ~0;
1328 if (current_config_index != ~0)
1330 b_head->current_config_index = current_config_index;
1331 vnet_buffer (b_head)->feature_arc_index = feature_arc_idx;
1335 ASSERT (n_left >= n_descs_to_process);
1336 n_left -= n_descs_to_process;
1338 /* advance to next descrptor */
1339 desc_current = (desc_current + n_descs_to_process) & mask;
1342 * Although separating memory copies from virtio ring parsing
1343 * is beneficial, we can offer to perform the copies from time
1344 * to time in order to free some space in the ring.
1346 if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD))
1348 rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len,
1350 if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
1351 vlib_error_count (vm, node->node_index, rv, 1);
1355 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1357 /* Do the memory copies */
1358 rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, &map_hint);
1359 if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
1360 vlib_error_count (vm, node->node_index, rv, 1);
1362 /* Must do the tracing before giving buffers back to driver */
1363 if (PREDICT_FALSE (n_trace))
1365 u32 left = n_rx_packets;
1367 b = cpu->rx_buffers_pdesc;
1368 while (n_trace && left)
1372 vlib_trace_buffer (vm, node, next_index, b[0],
1373 /* follow_chain */ 0);
1374 t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
1376 vhost_user_rx_trace_packed (t0, vui, qid, txvq, last_used_idx);
1377 last_used_idx = (last_used_idx + 1) & mask;
1380 vlib_set_trace_count (vm, node, n_trace);
1385 * Give buffers back to driver.
1387 vhost_user_mark_desc_consumed (vui, txvq, desc_head, n_descs_processed);
1389 /* interrupt (call) handling */
1390 if ((txvq->callfd_idx != ~0) &&
1391 (txvq->avail_event->flags != VRING_EVENT_F_DISABLE))
1393 txvq->n_since_last_int += n_rx_packets;
1394 if (txvq->n_since_last_int > vum->coalesce_frames)
1395 vhost_user_send_call (vm, txvq);
1398 /* increase rx counters */
1399 vlib_increment_combined_counter
1400 (vnet_main.interface_main.combined_sw_if_counters
1401 + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index,
1402 n_rx_packets, n_rx_bytes);
1404 vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
1406 if (PREDICT_FALSE (buffers_used < buffers_required))
1407 vlib_buffer_free (vm, next, buffers_required - buffers_used);
1410 return n_rx_packets;
1413 VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm,
1414 vlib_node_runtime_t * node,
1415 vlib_frame_t * frame)
1417 vhost_user_main_t *vum = &vhost_user_main;
1418 uword n_rx_packets = 0;
1419 vhost_user_intf_t *vui;
1420 vnet_device_input_runtime_t *rt =
1421 (vnet_device_input_runtime_t *) node->runtime_data;
1422 vnet_device_and_queue_t *dq;
1424 vec_foreach (dq, rt->devices_and_queues)
1426 if ((node->state == VLIB_NODE_STATE_POLLING) ||
1427 clib_atomic_swap_acq_n (&dq->interrupt_pending, 0))
1430 pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance);
1431 if (vhost_user_is_packed_ring_supported (vui))
1433 if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM))
1434 n_rx_packets += vhost_user_if_input_packed (vm, vum, vui,
1438 n_rx_packets += vhost_user_if_input_packed (vm, vum, vui,
1444 if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM))
1445 n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id,
1448 n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id,
1454 return n_rx_packets;
1458 VLIB_REGISTER_NODE (vhost_user_input_node) = {
1459 .type = VLIB_NODE_TYPE_INPUT,
1460 .name = "vhost-user-input",
1461 .sibling_of = "device-input",
1462 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1464 /* Will be enabled if/when hardware is detected. */
1465 .state = VLIB_NODE_STATE_DISABLED,
1467 .format_buffer = format_ethernet_header_with_length,
1468 .format_trace = format_vhost_trace,
1470 .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR,
1471 .error_strings = vhost_user_input_func_error_strings,
1476 * fd.io coding-style-patch-verification: ON
1479 * eval: (c-set-style "gnu")