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 _(NOT_READY, "vhost interface not ready or down") \
78 _(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)")
82 #define _(f,s) VHOST_USER_INPUT_FUNC_ERROR_##f,
83 foreach_vhost_user_input_func_error
85 VHOST_USER_INPUT_FUNC_N_ERROR,
86 } vhost_user_input_func_error_t;
88 static __clib_unused char *vhost_user_input_func_error_strings[] = {
90 foreach_vhost_user_input_func_error
94 static_always_inline void
95 vhost_user_rx_trace (vhost_trace_t * t,
96 vhost_user_intf_t * vui, u16 qid,
97 vlib_buffer_t * b, vhost_user_vring_t * txvq,
100 vhost_user_main_t *vum = &vhost_user_main;
101 u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask];
102 vring_desc_t *hdr_desc = 0;
103 virtio_net_hdr_mrg_rxbuf_t *hdr;
106 clib_memset (t, 0, sizeof (*t));
107 t->device_index = vui - vum->vhost_user_interfaces;
110 hdr_desc = &txvq->desc[desc_current];
111 if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
113 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
114 /* Header is the first here */
115 hdr_desc = map_guest_mem (vui, txvq->desc[desc_current].addr, &hint);
117 if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT)
119 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
121 if (!(txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) &&
122 !(txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT))
124 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
127 t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
129 if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint)))
131 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR;
135 u32 len = vui->virtio_net_hdr_sz;
136 memcpy (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len);
140 static_always_inline u32
141 vhost_user_input_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy,
142 u16 copy_len, u32 * map_hint)
144 void *src0, *src1, *src2, *src3;
145 if (PREDICT_TRUE (copy_len >= 4))
147 if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[0].src, map_hint))))
149 if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[1].src, map_hint))))
152 while (PREDICT_TRUE (copy_len >= 4))
158 (!(src2 = map_guest_mem (vui, cpy[2].src, map_hint))))
161 (!(src3 = map_guest_mem (vui, cpy[3].src, map_hint))))
164 CLIB_PREFETCH (src2, 64, LOAD);
165 CLIB_PREFETCH (src3, 64, LOAD);
167 clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len);
168 clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len);
175 if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint))))
177 clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len);
185 * Try to discard packets from the tx ring (VPP RX path).
186 * Returns the number of discarded packets.
188 static_always_inline u32
189 vhost_user_rx_discard_packet (vlib_main_t * vm,
190 vhost_user_intf_t * vui,
191 vhost_user_vring_t * txvq, u32 discard_max)
194 * On the RX side, each packet corresponds to one descriptor
195 * (it is the same whether it is a shallow descriptor, chained, or indirect).
196 * Therefore, discarding a packet is like discarding a descriptor.
198 u32 discarded_packets = 0;
199 u32 avail_idx = txvq->avail->idx;
200 u16 mask = txvq->qsz_mask;
201 u16 last_avail_idx = txvq->last_avail_idx;
202 u16 last_used_idx = txvq->last_used_idx;
203 while (discarded_packets != discard_max)
205 if (avail_idx == last_avail_idx)
208 u16 desc_chain_head = txvq->avail->ring[last_avail_idx & mask];
210 txvq->used->ring[last_used_idx & mask].id = desc_chain_head;
211 txvq->used->ring[last_used_idx & mask].len = 0;
212 vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
218 txvq->last_avail_idx = last_avail_idx;
219 txvq->last_used_idx = last_used_idx;
220 CLIB_MEMORY_STORE_BARRIER ();
221 txvq->used->idx = txvq->last_used_idx;
222 vhost_user_log_dirty_ring (vui, txvq, idx);
223 return discarded_packets;
227 * In case of overflow, we need to rewind the array of allocated buffers.
229 static_always_inline void
230 vhost_user_input_rewind_buffers (vlib_main_t * vm,
231 vhost_cpu_t * cpu, vlib_buffer_t * b_head)
233 u32 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
234 vlib_buffer_t *b_current = vlib_get_buffer (vm, bi_current);
235 b_current->current_length = 0;
236 b_current->flags = 0;
237 while (b_current != b_head)
239 cpu->rx_buffers_len++;
240 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
241 b_current = vlib_get_buffer (vm, bi_current);
242 b_current->current_length = 0;
243 b_current->flags = 0;
245 cpu->rx_buffers_len++;
248 static_always_inline void
249 vhost_user_handle_rx_offload (vlib_buffer_t * b0, u8 * b0_data,
250 virtio_net_hdr_t * hdr)
254 ethernet_header_t *eh = (ethernet_header_t *) b0_data;
255 u16 ethertype = clib_net_to_host_u16 (eh->type);
256 u16 l2hdr_sz = sizeof (ethernet_header_t);
258 if (ethernet_frame_is_tagged (ethertype))
260 ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
262 ethertype = clib_net_to_host_u16 (vlan->type);
263 l2hdr_sz += sizeof (*vlan);
264 if (ethertype == ETHERNET_TYPE_VLAN)
267 ethertype = clib_net_to_host_u16 (vlan->type);
268 l2hdr_sz += sizeof (*vlan);
271 vnet_buffer (b0)->l2_hdr_offset = 0;
272 vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
273 vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start;
274 b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
275 VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
276 VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
278 if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
280 ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz);
281 l4_proto = ip4->protocol;
282 b0->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
284 else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
286 ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz);
287 l4_proto = ip6->protocol;
288 b0->flags |= VNET_BUFFER_F_IS_IP6;
291 if (l4_proto == IP_PROTOCOL_TCP)
293 tcp_header_t *tcp = (tcp_header_t *)
294 (b0_data + vnet_buffer (b0)->l4_hdr_offset);
295 l4_hdr_sz = tcp_header_bytes (tcp);
297 b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
299 else if (l4_proto == IP_PROTOCOL_UDP)
302 (udp_header_t *) (b0_data + vnet_buffer (b0)->l4_hdr_offset);
303 l4_hdr_sz = sizeof (*udp);
305 b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
308 if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP)
310 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
311 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
312 b0->flags |= VNET_BUFFER_F_GSO;
314 else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
316 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
317 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
318 b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4);
320 else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
322 vnet_buffer2 (b0)->gso_size = hdr->gso_size;
323 vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
324 b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6);
328 static_always_inline void
329 vhost_user_input_do_interrupt (vlib_main_t * vm, vhost_user_vring_t * txvq,
330 vhost_user_vring_t * rxvq)
332 f64 now = vlib_time_now (vm);
334 if ((txvq->n_since_last_int) && (txvq->int_deadline < now))
335 vhost_user_send_call (vm, txvq);
337 if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now))
338 vhost_user_send_call (vm, rxvq);
341 static_always_inline void
342 vhost_user_input_setup_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
343 vhost_user_intf_t * vui,
344 u32 * current_config_index, u32 * next_index,
345 u32 ** to_next, u32 * n_left_to_next)
347 vnet_feature_main_t *fm = &feature_main;
348 u8 feature_arc_idx = fm->device_input_feature_arc_index;
350 if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index)))
352 vnet_feature_config_main_t *cm;
353 cm = &fm->feature_config_mains[feature_arc_idx];
354 *current_config_index = vec_elt (cm->config_index_by_sw_if_index,
356 vnet_get_config_data (&cm->config_main, current_config_index,
360 vlib_get_new_next_frame (vm, node, *next_index, *to_next, *n_left_to_next);
362 if (*next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT)
364 /* give some hints to ethernet-input */
365 vlib_next_frame_t *nf;
367 ethernet_input_frame_t *ef;
368 nf = vlib_node_runtime_get_next_frame (vm, node, *next_index);
369 f = vlib_get_frame (vm, nf->frame);
370 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
372 ef = vlib_frame_scalar_args (f);
373 ef->sw_if_index = vui->sw_if_index;
374 ef->hw_if_index = vui->hw_if_index;
375 vlib_frame_no_append (f);
379 static_always_inline u32
380 vhost_user_if_input (vlib_main_t * vm,
381 vhost_user_main_t * vum,
382 vhost_user_intf_t * vui,
383 u16 qid, vlib_node_runtime_t * node,
384 vnet_hw_interface_rx_mode mode, u8 enable_csum)
386 vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
387 vnet_feature_main_t *fm = &feature_main;
388 u16 n_rx_packets = 0;
391 u32 n_left_to_next, *to_next;
392 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
393 u32 n_trace = vlib_get_trace_count (vm, node);
394 u32 buffer_data_size = vlib_buffer_get_default_data_size (vm);
396 vhost_cpu_t *cpu = &vum->cpus[vm->thread_index];
398 u8 feature_arc_idx = fm->device_input_feature_arc_index;
399 u32 current_config_index = ~(u32) 0;
400 u16 mask = txvq->qsz_mask;
402 /* The descriptor table is not ready yet */
403 if (PREDICT_FALSE (txvq->avail == 0))
407 /* do we have pending interrupts ? */
408 vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
409 vhost_user_input_do_interrupt (vm, txvq, rxvq);
413 * For adaptive mode, it is optimized to reduce interrupts.
414 * If the scheduler switches the input node to polling due
415 * to burst of traffic, we tell the driver no interrupt.
416 * When the traffic subsides, the scheduler switches the node back to
417 * interrupt mode. We must tell the driver we want interrupt.
419 if (PREDICT_FALSE (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE))
422 VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
424 VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
425 /* Tell driver we want notification */
426 txvq->used->flags = 0;
428 /* Tell driver we don't want notification */
429 txvq->used->flags = VRING_USED_F_NO_NOTIFY;
432 if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE))
435 n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx);
438 if (PREDICT_FALSE (n_left == 0))
441 if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled)))
444 * Discard input packet if interface is admin down or vring is not
446 * "For example, for a networking device, in the disabled state
447 * client must not supply any new RX packets, but must process
448 * and discard any TX packets."
450 vhost_user_rx_discard_packet (vm, vui, txvq,
451 VHOST_USER_DOWN_DISCARD_COUNT);
455 if (PREDICT_FALSE (n_left == (mask + 1)))
458 * Informational error logging when VPP is not
459 * receiving packets fast enough.
461 vlib_error_count (vm, node->node_index,
462 VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1);
465 if (n_left > VLIB_FRAME_SIZE)
466 n_left = VLIB_FRAME_SIZE;
469 * For small packets (<2kB), we will not need more than one vlib buffer
470 * per packet. In case packets are bigger, we will just yield at some point
471 * in the loop and come back later. This is not an issue as for big packet,
472 * processing cost really comes from the memory copy.
473 * The assumption is that big packets will fit in 40 buffers.
475 if (PREDICT_FALSE (cpu->rx_buffers_len < n_left + 1 ||
476 cpu->rx_buffers_len < 40))
478 u32 curr_len = cpu->rx_buffers_len;
479 cpu->rx_buffers_len +=
480 vlib_buffer_alloc (vm, cpu->rx_buffers + curr_len,
481 VHOST_USER_RX_BUFFERS_N - curr_len);
484 (cpu->rx_buffers_len < VHOST_USER_RX_BUFFER_STARVATION))
486 /* In case of buffer starvation, discard some packets from the queue
488 * We keep doing best effort for the remaining packets. */
489 u32 flush = (n_left + 1 > cpu->rx_buffers_len) ?
490 n_left + 1 - cpu->rx_buffers_len : 1;
491 flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush);
494 vlib_increment_simple_counter (vnet_main.
495 interface_main.sw_if_counters +
496 VNET_INTERFACE_COUNTER_DROP,
497 vm->thread_index, vui->sw_if_index,
500 vlib_error_count (vm, vhost_user_input_node.index,
501 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush);
505 vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index,
506 &next_index, &to_next, &n_left_to_next);
508 u16 last_avail_idx = txvq->last_avail_idx;
509 u16 last_used_idx = txvq->last_used_idx;
513 vlib_buffer_t *b_head, *b_current;
516 u32 desc_data_offset;
517 vring_desc_t *desc_table = txvq->desc;
519 if (PREDICT_FALSE (cpu->rx_buffers_len <= 1))
521 /* Not enough rx_buffers
522 * Note: We yeld on 1 so we don't need to do an additional
523 * check for the next buffer prefetch.
529 desc_current = txvq->avail->ring[last_avail_idx & mask];
530 cpu->rx_buffers_len--;
531 bi_current = cpu->rx_buffers[cpu->rx_buffers_len];
532 b_head = b_current = vlib_get_buffer (vm, bi_current);
533 to_next[0] = bi_current; //We do that now so we can forget about bi_current
537 vlib_prefetch_buffer_with_index
538 (vm, cpu->rx_buffers[cpu->rx_buffers_len - 1], LOAD);
540 /* Just preset the used descriptor id and length for later */
541 txvq->used->ring[last_used_idx & mask].id = desc_current;
542 txvq->used->ring[last_used_idx & mask].len = 0;
543 vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]);
545 /* The buffer should already be initialized */
546 b_head->total_length_not_including_first_buffer = 0;
547 b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
549 if (PREDICT_FALSE (n_trace))
551 vlib_trace_buffer (vm, node, next_index, b_head,
552 /* follow_chain */ 0);
554 vlib_add_trace (vm, node, b_head, sizeof (t0[0]));
555 vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx);
557 vlib_set_trace_count (vm, node, n_trace);
560 /* This depends on the setup but is very consistent
561 * So I think the CPU branch predictor will make a pretty good job
562 * at optimizing the decision. */
563 if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
565 desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr,
568 if (PREDICT_FALSE (desc_table == 0))
570 vlib_error_count (vm, node->node_index,
571 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
576 desc_data_offset = vui->virtio_net_hdr_sz;
580 virtio_net_hdr_mrg_rxbuf_t *hdr;
584 hdr = map_guest_mem (vui, desc_table[desc_current].addr, &map_hint);
585 if (PREDICT_FALSE (hdr == 0))
587 vlib_error_count (vm, node->node_index,
588 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
591 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
593 if ((desc_data_offset == desc_table[desc_current].len) &&
594 (desc_table[desc_current].flags & VIRTQ_DESC_F_NEXT))
596 current = desc_table[desc_current].next;
597 b_data = map_guest_mem (vui, desc_table[current].addr,
599 if (PREDICT_FALSE (b_data == 0))
601 vlib_error_count (vm, node->node_index,
602 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL,
608 b_data = (u8 *) hdr + desc_data_offset;
610 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
616 /* Get more input if necessary. Or end of packet. */
617 if (desc_data_offset == desc_table[desc_current].len)
619 if (PREDICT_FALSE (desc_table[desc_current].flags &
622 desc_current = desc_table[desc_current].next;
623 desc_data_offset = 0;
631 /* Get more output if necessary. Or end of packet. */
632 if (PREDICT_FALSE (b_current->current_length == buffer_data_size))
634 if (PREDICT_FALSE (cpu->rx_buffers_len == 0))
636 /* Cancel speculation */
641 * Checking if there are some left buffers.
642 * If not, just rewind the used buffers and stop.
643 * Note: Scheduled copies are not cancelled. This is
644 * not an issue as they would still be valid. Useless,
647 vhost_user_input_rewind_buffers (vm, cpu, b_head);
652 /* Get next output */
653 cpu->rx_buffers_len--;
654 u32 bi_next = cpu->rx_buffers[cpu->rx_buffers_len];
655 b_current->next_buffer = bi_next;
656 b_current->flags |= VLIB_BUFFER_NEXT_PRESENT;
657 bi_current = bi_next;
658 b_current = vlib_get_buffer (vm, bi_current);
661 /* Prepare a copy order executed later for the data */
662 ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
663 vhost_copy_t *cpy = &cpu->copy[copy_len];
665 u32 desc_data_l = desc_table[desc_current].len - desc_data_offset;
666 cpy->len = buffer_data_size - b_current->current_length;
667 cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len;
668 cpy->dst = (uword) (vlib_buffer_get_current (b_current) +
669 b_current->current_length);
670 cpy->src = desc_table[desc_current].addr + desc_data_offset;
672 desc_data_offset += cpy->len;
674 b_current->current_length += cpy->len;
675 b_head->total_length_not_including_first_buffer += cpy->len;
680 n_rx_bytes += b_head->total_length_not_including_first_buffer;
683 b_head->total_length_not_including_first_buffer -=
684 b_head->current_length;
686 /* consume the descriptor and return it as used */
690 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
692 vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index;
693 vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0;
696 if (current_config_index != ~(u32) 0)
698 b_head->current_config_index = current_config_index;
699 vnet_buffer (b_head)->feature_arc_index = feature_arc_idx;
705 * Although separating memory copies from virtio ring parsing
706 * is beneficial, we can offer to perform the copies from time
707 * to time in order to free some space in the ring.
709 if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD))
711 if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy,
712 copy_len, &map_hint)))
714 vlib_error_count (vm, node->node_index,
715 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
719 /* give buffers back to driver */
720 CLIB_MEMORY_STORE_BARRIER ();
721 txvq->used->idx = last_used_idx;
722 vhost_user_log_dirty_ring (vui, txvq, idx);
726 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
728 txvq->last_used_idx = last_used_idx;
729 txvq->last_avail_idx = last_avail_idx;
731 /* Do the memory copies */
732 if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len,
735 vlib_error_count (vm, node->node_index,
736 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
739 /* give buffers back to driver */
740 CLIB_MEMORY_STORE_BARRIER ();
741 txvq->used->idx = txvq->last_used_idx;
742 vhost_user_log_dirty_ring (vui, txvq, idx);
744 /* interrupt (call) handling */
745 if ((txvq->callfd_idx != ~0) &&
746 !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT))
748 txvq->n_since_last_int += n_rx_packets;
750 if (txvq->n_since_last_int > vum->coalesce_frames)
751 vhost_user_send_call (vm, txvq);
754 /* increase rx counters */
755 vlib_increment_combined_counter
756 (vnet_main.interface_main.combined_sw_if_counters
757 + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index,
758 n_rx_packets, n_rx_bytes);
760 vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
766 static_always_inline void
767 vhost_user_mark_desc_consumed (vhost_user_intf_t * vui,
768 vhost_user_vring_t * txvq, u16 desc_head,
769 u16 n_descs_processed)
771 vring_packed_desc_t *desc_table = txvq->packed_desc;
773 u16 mask = txvq->qsz_mask;
775 for (desc_idx = 0; desc_idx < n_descs_processed; desc_idx++)
777 if (txvq->used_wrap_counter)
778 desc_table[(desc_head + desc_idx) & mask].flags |=
779 (VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED);
781 desc_table[(desc_head + desc_idx) & mask].flags &=
782 ~(VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED);
783 vhost_user_advance_last_used_idx (txvq);
787 static_always_inline void
788 vhost_user_rx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui,
789 u16 qid, vhost_user_vring_t * txvq,
792 vhost_user_main_t *vum = &vhost_user_main;
793 vring_packed_desc_t *hdr_desc;
794 virtio_net_hdr_mrg_rxbuf_t *hdr;
797 clib_memset (t, 0, sizeof (*t));
798 t->device_index = vui - vum->vhost_user_interfaces;
801 hdr_desc = &txvq->packed_desc[desc_current];
802 if (txvq->packed_desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
804 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
805 /* Header is the first here */
806 hdr_desc = map_guest_mem (vui, txvq->packed_desc[desc_current].addr,
809 if (txvq->packed_desc[desc_current].flags & VIRTQ_DESC_F_NEXT)
810 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
812 if (!(txvq->packed_desc[desc_current].flags & VIRTQ_DESC_F_NEXT) &&
813 !(txvq->packed_desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT))
814 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
816 t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
818 if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint)))
819 t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR;
822 u32 len = vui->virtio_net_hdr_sz;
823 clib_memcpy_fast (&t->hdr, hdr,
824 len > hdr_desc->len ? hdr_desc->len : len);
828 static_always_inline u32
829 vhost_user_rx_discard_packet_packed (vlib_main_t * vm,
830 vhost_user_intf_t * vui,
831 vhost_user_vring_t * txvq,
834 u32 discarded_packets = 0;
835 u16 mask = txvq->qsz_mask;
836 u16 desc_current, desc_head;
838 desc_head = desc_current = txvq->last_used_idx & mask;
841 * On the RX side, each packet corresponds to one descriptor
842 * (it is the same whether it is a shallow descriptor, chained, or indirect).
843 * Therefore, discarding a packet is like discarding a descriptor.
845 while ((discarded_packets != discard_max) &&
846 vhost_user_packed_desc_available (txvq, desc_current))
848 vhost_user_advance_last_avail_idx (txvq);
850 desc_current = (desc_current + 1) & mask;
853 if (PREDICT_TRUE (discarded_packets))
854 vhost_user_mark_desc_consumed (vui, txvq, desc_head, discarded_packets);
855 return (discarded_packets);
858 static_always_inline u32
859 vhost_user_input_copy_packed (vhost_user_intf_t * vui, vhost_copy_t * cpy,
860 u16 copy_len, u32 * map_hint)
862 void *src0, *src1, *src2, *src3, *src4, *src5, *src6, *src7;
864 u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR;
866 if (PREDICT_TRUE (copy_len >= 8))
868 src4 = map_guest_mem (vui, cpy[0].src, map_hint);
869 src5 = map_guest_mem (vui, cpy[1].src, map_hint);
870 src6 = map_guest_mem (vui, cpy[2].src, map_hint);
871 src7 = map_guest_mem (vui, cpy[3].src, map_hint);
872 bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0);
873 if (PREDICT_FALSE (bad))
875 CLIB_PREFETCH (src4, 64, LOAD);
876 CLIB_PREFETCH (src5, 64, LOAD);
877 CLIB_PREFETCH (src6, 64, LOAD);
878 CLIB_PREFETCH (src7, 64, LOAD);
880 while (PREDICT_TRUE (copy_len >= 8))
887 src4 = map_guest_mem (vui, cpy[4].src, map_hint);
888 src5 = map_guest_mem (vui, cpy[5].src, map_hint);
889 src6 = map_guest_mem (vui, cpy[6].src, map_hint);
890 src7 = map_guest_mem (vui, cpy[7].src, map_hint);
891 bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0);
892 if (PREDICT_FALSE (bad))
895 CLIB_PREFETCH (src4, 64, LOAD);
896 CLIB_PREFETCH (src5, 64, LOAD);
897 CLIB_PREFETCH (src6, 64, LOAD);
898 CLIB_PREFETCH (src7, 64, LOAD);
900 clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len);
901 clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len);
902 clib_memcpy_fast ((void *) cpy[2].dst, src2, cpy[2].len);
903 clib_memcpy_fast ((void *) cpy[3].dst, src3, cpy[3].len);
912 if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint))))
914 rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
917 clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len);
924 static_always_inline u32
925 vhost_user_do_offload (vhost_user_intf_t * vui,
926 vring_packed_desc_t * desc_table, u16 desc_current,
927 u16 mask, vlib_buffer_t * b_head, u32 * map_hint)
929 u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR;
930 virtio_net_hdr_mrg_rxbuf_t *hdr;
932 u32 desc_data_offset = vui->virtio_net_hdr_sz;
934 hdr = map_guest_mem (vui, desc_table[desc_current].addr, map_hint);
935 if (PREDICT_FALSE (hdr == 0))
936 rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
937 else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
939 if (desc_data_offset == desc_table[desc_current].len)
941 desc_current = (desc_current + 1) & mask;
943 map_guest_mem (vui, desc_table[desc_current].addr, map_hint);
944 if (PREDICT_FALSE (b_data == 0))
945 rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
947 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
951 b_data = (u8 *) hdr + desc_data_offset;
952 vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
959 static_always_inline u32
960 vhost_user_compute_buffers_required (u32 desc_len, u32 buffer_data_size)
963 u32 buffers_required;
965 if (PREDICT_TRUE (buffer_data_size == 2048))
967 buffers_required = desc_len >> 11;
968 if ((desc_len & 2047) != 0)
970 return (buffers_required);
973 if (desc_len < buffer_data_size)
976 result = div (desc_len, buffer_data_size);
978 buffers_required = result.quot + 1;
980 buffers_required = result.quot;
982 return (buffers_required);
985 static_always_inline u32
986 vhost_user_compute_indirect_desc_len (vhost_user_intf_t * vui,
987 vhost_user_vring_t * txvq,
988 u32 buffer_data_size, u16 desc_current,
991 vring_packed_desc_t *desc_table = txvq->packed_desc;
993 u16 desc_data_offset = vui->virtio_net_hdr_sz;
994 u16 desc_idx = desc_current;
997 n_descs = desc_table[desc_idx].len >> 4;
998 desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, map_hint);
999 if (PREDICT_FALSE (desc_table == 0))
1002 for (desc_idx = 0; desc_idx < n_descs; desc_idx++)
1003 desc_len += desc_table[desc_idx].len;
1005 if (PREDICT_TRUE (desc_len > desc_data_offset))
1006 desc_len -= desc_data_offset;
1008 return vhost_user_compute_buffers_required (desc_len, buffer_data_size);
1011 static_always_inline u32
1012 vhost_user_compute_chained_desc_len (vhost_user_intf_t * vui,
1013 vhost_user_vring_t * txvq,
1014 u32 buffer_data_size, u16 * current,
1017 vring_packed_desc_t *desc_table = txvq->packed_desc;
1019 u16 mask = txvq->qsz_mask;
1021 while (desc_table[*current].flags & VIRTQ_DESC_F_NEXT)
1023 desc_len += desc_table[*current].len;
1025 *current = (*current + 1) & mask;
1026 vhost_user_advance_last_avail_idx (txvq);
1028 desc_len += desc_table[*current].len;
1030 *current = (*current + 1) & mask;
1031 vhost_user_advance_last_avail_idx (txvq);
1033 if (PREDICT_TRUE (desc_len > vui->virtio_net_hdr_sz))
1034 desc_len -= vui->virtio_net_hdr_sz;
1036 return vhost_user_compute_buffers_required (desc_len, buffer_data_size);
1039 static_always_inline void
1040 vhost_user_assemble_packet (vring_packed_desc_t * desc_table,
1041 u16 * desc_idx, vlib_buffer_t * b_head,
1042 vlib_buffer_t ** b_current, u32 ** next,
1043 vlib_buffer_t *** b, u32 * bi_current,
1044 vhost_cpu_t * cpu, u16 * copy_len,
1045 u32 * buffers_used, u32 buffers_required,
1046 u32 * desc_data_offset, u32 buffer_data_size,
1051 while (*desc_data_offset < desc_table[*desc_idx].len)
1053 /* Get more output if necessary. Or end of packet. */
1054 if (PREDICT_FALSE ((*b_current)->current_length == buffer_data_size))
1056 /* Get next output */
1057 u32 bi_next = **next;
1059 (*b_current)->next_buffer = bi_next;
1060 (*b_current)->flags |= VLIB_BUFFER_NEXT_PRESENT;
1061 *bi_current = bi_next;
1065 ASSERT (*buffers_used <= buffers_required);
1068 /* Prepare a copy order executed later for the data */
1069 ASSERT (*copy_len < VHOST_USER_COPY_ARRAY_N);
1070 vhost_copy_t *cpy = &cpu->copy[*copy_len];
1072 desc_data_l = desc_table[*desc_idx].len - *desc_data_offset;
1073 cpy->len = buffer_data_size - (*b_current)->current_length;
1074 cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len;
1075 cpy->dst = (uword) (vlib_buffer_get_current (*b_current) +
1076 (*b_current)->current_length);
1077 cpy->src = desc_table[*desc_idx].addr + *desc_data_offset;
1079 *desc_data_offset += cpy->len;
1081 (*b_current)->current_length += cpy->len;
1082 b_head->total_length_not_including_first_buffer += cpy->len;
1084 *desc_idx = (*desc_idx + 1) & mask;;
1085 *desc_data_offset = 0;
1088 static_always_inline u32
1089 vhost_user_if_input_packed (vlib_main_t * vm, vhost_user_main_t * vum,
1090 vhost_user_intf_t * vui, u16 qid,
1091 vlib_node_runtime_t * node,
1092 vnet_hw_interface_rx_mode mode, u8 enable_csum)
1094 vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
1095 vnet_feature_main_t *fm = &feature_main;
1096 u8 feature_arc_idx = fm->device_input_feature_arc_index;
1097 u16 n_rx_packets = 0;
1100 u32 buffers_required = 0;
1101 u32 n_left_to_next, *to_next;
1102 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
1103 u32 n_trace = vlib_get_trace_count (vm, node);
1104 u32 buffer_data_size = vlib_buffer_get_default_data_size (vm);
1106 vhost_cpu_t *cpu = &vum->cpus[vm->thread_index];
1108 u32 current_config_index = ~0;
1109 u16 mask = txvq->qsz_mask;
1110 u16 desc_current, desc_head, last_used_idx;
1111 vring_packed_desc_t *desc_table = 0;
1112 u32 n_descs_processed = 0;
1116 u32 buffers_used = 0;
1117 u16 current, n_descs_to_process;
1119 /* The descriptor table is not ready yet */
1120 if (PREDICT_FALSE (txvq->packed_desc == 0))
1123 /* do we have pending interrupts ? */
1124 vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
1125 vhost_user_input_do_interrupt (vm, txvq, rxvq);
1128 * For adaptive mode, it is optimized to reduce interrupts.
1129 * If the scheduler switches the input node to polling due
1130 * to burst of traffic, we tell the driver no interrupt.
1131 * When the traffic subsides, the scheduler switches the node back to
1132 * interrupt mode. We must tell the driver we want interrupt.
1134 if (PREDICT_FALSE (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE))
1137 VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
1139 VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
1140 /* Tell driver we want notification */
1141 txvq->used_event->flags = 0;
1143 /* Tell driver we don't want notification */
1144 txvq->used_event->flags = VRING_EVENT_F_DISABLE;
1147 last_used_idx = txvq->last_used_idx & mask;
1148 desc_head = desc_current = last_used_idx;
1150 if (vhost_user_packed_desc_available (txvq, desc_current) == 0)
1153 if (PREDICT_FALSE (!vui->admin_up || !vui->is_ready || !(txvq->enabled)))
1156 * Discard input packet if interface is admin down or vring is not
1158 * "For example, for a networking device, in the disabled state
1159 * client must not supply any new RX packets, but must process
1160 * and discard any TX packets."
1162 rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq,
1163 VHOST_USER_DOWN_DISCARD_COUNT);
1164 vlib_error_count (vm, vhost_user_input_node.index,
1165 VHOST_USER_INPUT_FUNC_ERROR_NOT_READY, rv);
1169 vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index,
1170 &next_index, &to_next, &n_left_to_next);
1173 * Compute n_left and total buffers needed
1175 desc_table = txvq->packed_desc;
1176 current = desc_current;
1177 while (vhost_user_packed_desc_available (txvq, current) &&
1178 (n_left < VLIB_FRAME_SIZE))
1180 if (desc_table[current].flags & VIRTQ_DESC_F_INDIRECT)
1183 vhost_user_compute_indirect_desc_len (vui, txvq, buffer_data_size,
1184 current, &map_hint);
1186 current = (current + 1) & mask;
1187 vhost_user_advance_last_avail_idx (txvq);
1192 vhost_user_compute_chained_desc_len (vui, txvq, buffer_data_size,
1197 /* Something is broken if we need more than 10000 buffers */
1198 if (PREDICT_FALSE ((buffers_required == 0) || (buffers_required > 10000)))
1200 rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left);
1201 vlib_error_count (vm, vhost_user_input_node.index,
1202 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv);
1206 vec_validate (cpu->to_next_list, buffers_required);
1207 rv = vlib_buffer_alloc (vm, cpu->to_next_list, buffers_required);
1208 if (PREDICT_FALSE (rv != buffers_required))
1210 vlib_buffer_free (vm, cpu->to_next_list, rv);
1211 rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left);
1212 vlib_error_count (vm, vhost_user_input_node.index,
1213 VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv);
1217 next = cpu->to_next_list;
1218 vec_validate (cpu->rx_buffers_pdesc, buffers_required);
1219 vlib_get_buffers (vm, next, cpu->rx_buffers_pdesc, buffers_required);
1220 b = cpu->rx_buffers_pdesc;
1221 n_descs_processed = n_left;
1225 vlib_buffer_t *b_head, *b_current;
1227 u32 desc_data_offset;
1228 u16 desc_idx = desc_current;
1231 desc_table = txvq->packed_desc;
1232 to_next[0] = bi_current = next[0];
1233 b_head = b_current = b[0];
1236 ASSERT (buffers_used <= buffers_required);
1241 /* The buffer should already be initialized */
1242 b_head->total_length_not_including_first_buffer = 0;
1243 b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
1244 desc_data_offset = vui->virtio_net_hdr_sz;
1245 n_descs_to_process = 1;
1247 if (desc_table[desc_idx].flags & VIRTQ_DESC_F_INDIRECT)
1249 n_descs = desc_table[desc_idx].len >> 4;
1250 desc_table = map_guest_mem (vui, desc_table[desc_idx].addr,
1253 if (PREDICT_FALSE (desc_table == 0) ||
1256 (vhost_user_do_offload
1257 (vui, desc_table, desc_idx, mask, b_head,
1258 &map_hint) != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))))
1260 vlib_error_count (vm, node->node_index,
1261 VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
1271 vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
1272 &b_current, &next, &b, &bi_current,
1273 cpu, ©_len, &buffers_used,
1274 buffers_required, &desc_data_offset,
1275 buffer_data_size, mask);
1283 rv = vhost_user_do_offload (vui, desc_table, desc_idx, mask,
1285 if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
1287 vlib_error_count (vm, node->node_index, rv, 1);
1297 * For chained descriptor, we process all chains in a single while
1298 * loop. So count how many descriptors in the chain.
1300 n_descs_to_process = 1;
1301 while (desc_table[desc_idx].flags & VIRTQ_DESC_F_NEXT)
1303 vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
1304 &b_current, &next, &b, &bi_current,
1305 cpu, ©_len, &buffers_used,
1306 buffers_required, &desc_data_offset,
1307 buffer_data_size, mask);
1308 n_descs_to_process++;
1310 vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
1311 &b_current, &next, &b, &bi_current,
1312 cpu, ©_len, &buffers_used,
1313 buffers_required, &desc_data_offset,
1314 buffer_data_size, mask);
1317 n_rx_bytes += b_head->total_length_not_including_first_buffer;
1320 b_head->total_length_not_including_first_buffer -=
1321 b_head->current_length;
1323 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
1325 vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index;
1326 vnet_buffer (b_head)->sw_if_index[VLIB_TX] = ~0;
1329 if (current_config_index != ~0)
1331 b_head->current_config_index = current_config_index;
1332 vnet_buffer (b_head)->feature_arc_index = feature_arc_idx;
1336 ASSERT (n_left >= n_descs_to_process);
1337 n_left -= n_descs_to_process;
1339 /* advance to next descrptor */
1340 desc_current = (desc_current + n_descs_to_process) & mask;
1343 * Although separating memory copies from virtio ring parsing
1344 * is beneficial, we can offer to perform the copies from time
1345 * to time in order to free some space in the ring.
1347 if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD))
1349 rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len,
1351 if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
1352 vlib_error_count (vm, node->node_index, rv, 1);
1356 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
1358 /* Do the memory copies */
1359 rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, &map_hint);
1360 if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
1361 vlib_error_count (vm, node->node_index, rv, 1);
1363 /* Must do the tracing before giving buffers back to driver */
1364 if (PREDICT_FALSE (n_trace))
1366 u32 left = n_rx_packets;
1368 b = cpu->rx_buffers_pdesc;
1369 while (n_trace && left)
1373 vlib_trace_buffer (vm, node, next_index, b[0],
1374 /* follow_chain */ 0);
1375 t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
1377 vhost_user_rx_trace_packed (t0, vui, qid, txvq, last_used_idx);
1378 last_used_idx = (last_used_idx + 1) & mask;
1381 vlib_set_trace_count (vm, node, n_trace);
1386 * Give buffers back to driver.
1388 vhost_user_mark_desc_consumed (vui, txvq, desc_head, n_descs_processed);
1390 /* interrupt (call) handling */
1391 if ((txvq->callfd_idx != ~0) &&
1392 (txvq->avail_event->flags != VRING_EVENT_F_DISABLE))
1394 txvq->n_since_last_int += n_rx_packets;
1395 if (txvq->n_since_last_int > vum->coalesce_frames)
1396 vhost_user_send_call (vm, txvq);
1399 /* increase rx counters */
1400 vlib_increment_combined_counter
1401 (vnet_main.interface_main.combined_sw_if_counters
1402 + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index,
1403 n_rx_packets, n_rx_bytes);
1405 vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
1407 if (PREDICT_FALSE (buffers_used < buffers_required))
1408 vlib_buffer_free (vm, next, buffers_required - buffers_used);
1411 return n_rx_packets;
1414 VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm,
1415 vlib_node_runtime_t * node,
1416 vlib_frame_t * frame)
1418 vhost_user_main_t *vum = &vhost_user_main;
1419 uword n_rx_packets = 0;
1420 vhost_user_intf_t *vui;
1421 vnet_device_input_runtime_t *rt =
1422 (vnet_device_input_runtime_t *) node->runtime_data;
1423 vnet_device_and_queue_t *dq;
1425 vec_foreach (dq, rt->devices_and_queues)
1427 if ((node->state == VLIB_NODE_STATE_POLLING) ||
1428 clib_atomic_swap_acq_n (&dq->interrupt_pending, 0))
1431 pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance);
1432 if (vhost_user_is_packed_ring_supported (vui))
1434 if (vui->features & (1ULL << FEAT_VIRTIO_NET_F_CSUM))
1435 n_rx_packets += vhost_user_if_input_packed (vm, vum, vui,
1439 n_rx_packets += vhost_user_if_input_packed (vm, vum, vui,
1445 if (vui->features & (1ULL << FEAT_VIRTIO_NET_F_CSUM))
1446 n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id,
1449 n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id,
1455 return n_rx_packets;
1459 VLIB_REGISTER_NODE (vhost_user_input_node) = {
1460 .type = VLIB_NODE_TYPE_INPUT,
1461 .name = "vhost-user-input",
1462 .sibling_of = "device-input",
1463 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
1465 /* Will be enabled if/when hardware is detected. */
1466 .state = VLIB_NODE_STATE_DISABLED,
1468 .format_buffer = format_ethernet_header_with_length,
1469 .format_trace = format_vhost_trace,
1471 .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR,
1472 .error_strings = vhost_user_input_func_error_strings,
1477 * fd.io coding-style-patch-verification: ON
1480 * eval: (c-set-style "gnu")