/* *------------------------------------------------------------------ * vhost-user-input * * Copyright (c) 2014-2018 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------ */ #include /* for open */ #include #include #include #include #include #include /* for iovec */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * When an RX queue is down but active, received packets * must be discarded. This value controls up to how many * packets will be discarded during each round. */ #define VHOST_USER_DOWN_DISCARD_COUNT 256 /* * When the number of available buffers gets under this threshold, * RX node will start discarding packets. */ #define VHOST_USER_RX_BUFFER_STARVATION 32 /* * On the receive side, the host should free descriptors as soon * as possible in order to avoid TX drop in the VM. * This value controls the number of copy operations that are stacked * before copy is done for all and descriptors are given back to * the guest. * The value 64 was obtained by testing (48 and 128 were not as good). */ #define VHOST_USER_RX_COPY_THRESHOLD 64 extern vlib_node_registration_t vhost_user_input_node; #define foreach_vhost_user_input_func_error \ _(NO_ERROR, "no error") \ _(NO_BUFFER, "no available buffer") \ _(MMAP_FAIL, "mmap failure") \ _(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \ _(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \ _(NOT_READY, "vhost interface not ready or down") \ _(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)") typedef enum { #define _(f,s) VHOST_USER_INPUT_FUNC_ERROR_##f, foreach_vhost_user_input_func_error #undef _ VHOST_USER_INPUT_FUNC_N_ERROR, } vhost_user_input_func_error_t; static __clib_unused char *vhost_user_input_func_error_strings[] = { #define _(n,s) s, foreach_vhost_user_input_func_error #undef _ }; static_always_inline void vhost_user_rx_trace (vhost_trace_t * t, vhost_user_intf_t * vui, u16 qid, vlib_buffer_t * b, vhost_user_vring_t * txvq, u16 last_avail_idx) { vhost_user_main_t *vum = &vhost_user_main; u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask]; vnet_virtio_vring_desc_t *hdr_desc = 0; vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; u32 hint = 0; clib_memset (t, 0, sizeof (*t)); t->device_index = vui - vum->vhost_user_interfaces; t->qid = qid; hdr_desc = &txvq->desc[desc_current]; if (txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT) { t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; /* Header is the first here */ hdr_desc = map_guest_mem (vui, txvq->desc[desc_current].addr, &hint); } if (txvq->desc[desc_current].flags & VRING_DESC_F_NEXT) { t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; } if (!(txvq->desc[desc_current].flags & VRING_DESC_F_NEXT) && !(txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT)) { t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; } t->first_desc_len = hdr_desc ? hdr_desc->len : 0; if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint))) { t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR; } else { u32 len = vui->virtio_net_hdr_sz; memcpy (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len); } } static_always_inline u32 vhost_user_input_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, u16 copy_len, u32 * map_hint) { void *src0, *src1, *src2, *src3; if (PREDICT_TRUE (copy_len >= 4)) { if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[0].src, map_hint)))) return 1; if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[1].src, map_hint)))) return 1; while (PREDICT_TRUE (copy_len >= 4)) { src0 = src2; src1 = src3; if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[2].src, map_hint)))) return 1; if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[3].src, map_hint)))) return 1; clib_prefetch_load (src2); clib_prefetch_load (src3); clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len); clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len); copy_len -= 2; cpy += 2; } } while (copy_len) { if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint)))) return 1; clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len); copy_len -= 1; cpy += 1; } return 0; } /** * Try to discard packets from the tx ring (VPP RX path). * Returns the number of discarded packets. */ static_always_inline u32 vhost_user_rx_discard_packet (vlib_main_t * vm, vhost_user_intf_t * vui, vhost_user_vring_t * txvq, u32 discard_max) { /* * On the RX side, each packet corresponds to one descriptor * (it is the same whether it is a shallow descriptor, chained, or indirect). * Therefore, discarding a packet is like discarding a descriptor. */ u32 discarded_packets = 0; u32 avail_idx = txvq->avail->idx; u16 mask = txvq->qsz_mask; u16 last_avail_idx = txvq->last_avail_idx; u16 last_used_idx = txvq->last_used_idx; while (discarded_packets != discard_max) { if (avail_idx == last_avail_idx) goto out; u16 desc_chain_head = txvq->avail->ring[last_avail_idx & mask]; last_avail_idx++; txvq->used->ring[last_used_idx & mask].id = desc_chain_head; txvq->used->ring[last_used_idx & mask].len = 0; vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]); last_used_idx++; discarded_packets++; } out: txvq->last_avail_idx = last_avail_idx; txvq->last_used_idx = last_used_idx; CLIB_MEMORY_STORE_BARRIER (); txvq->used->idx = txvq->last_used_idx; vhost_user_log_dirty_ring (vui, txvq, idx); return discarded_packets; } /* * In case of overflow, we need to rewind the array of allocated buffers. */ static_always_inline void vhost_user_input_rewind_buffers (vlib_main_t * vm, vhost_cpu_t * cpu, vlib_buffer_t * b_head) { u32 bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; vlib_buffer_t *b_current = vlib_get_buffer (vm, bi_current); b_current->current_length = 0; b_current->flags = 0; while (b_current != b_head) { cpu->rx_buffers_len++; bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; b_current = vlib_get_buffer (vm, bi_current); b_current->current_length = 0; b_current->flags = 0; } cpu->rx_buffers_len++; } static_always_inline void vhost_user_handle_rx_offload (vlib_buffer_t *b0, u8 *b0_data, vnet_virtio_net_hdr_t *hdr) { u8 l4_hdr_sz = 0; u8 l4_proto = 0; ethernet_header_t *eh = (ethernet_header_t *) b0_data; u16 ethertype = clib_net_to_host_u16 (eh->type); u16 l2hdr_sz = sizeof (ethernet_header_t); vnet_buffer_oflags_t oflags = 0; if (ethernet_frame_is_tagged (ethertype)) { ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1); ethertype = clib_net_to_host_u16 (vlan->type); l2hdr_sz += sizeof (*vlan); if (ethertype == ETHERNET_TYPE_VLAN) { vlan++; ethertype = clib_net_to_host_u16 (vlan->type); l2hdr_sz += sizeof (*vlan); } } vnet_buffer (b0)->l2_hdr_offset = 0; vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz; vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start; b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID | VNET_BUFFER_F_L3_HDR_OFFSET_VALID | VNET_BUFFER_F_L4_HDR_OFFSET_VALID); if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4)) { ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz); l4_proto = ip4->protocol; b0->flags |= VNET_BUFFER_F_IS_IP4; oflags |= VNET_BUFFER_OFFLOAD_F_IP_CKSUM; } else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6)) { ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz); l4_proto = ip6->protocol; b0->flags |= VNET_BUFFER_F_IS_IP6; } if (l4_proto == IP_PROTOCOL_TCP) { tcp_header_t *tcp = (tcp_header_t *) (b0_data + vnet_buffer (b0)->l4_hdr_offset); l4_hdr_sz = tcp_header_bytes (tcp); oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM; } else if (l4_proto == IP_PROTOCOL_UDP) { l4_hdr_sz = sizeof (udp_header_t); oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM; } if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP) { vnet_buffer2 (b0)->gso_size = hdr->gso_size; vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz; b0->flags |= VNET_BUFFER_F_GSO; } else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4) { vnet_buffer2 (b0)->gso_size = hdr->gso_size; vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz; b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4); } else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6) { vnet_buffer2 (b0)->gso_size = hdr->gso_size; vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz; b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6); } if (oflags) vnet_buffer_offload_flags_set (b0, oflags); } static_always_inline void vhost_user_input_do_interrupt (vlib_main_t * vm, vhost_user_intf_t * vui, vhost_user_vring_t * txvq, vhost_user_vring_t * rxvq) { f64 now = vlib_time_now (vm); if ((txvq->n_since_last_int) && (txvq->int_deadline < now)) vhost_user_send_call (vm, vui, txvq); if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now)) vhost_user_send_call (vm, vui, rxvq); } static_always_inline void vhost_user_input_setup_frame (vlib_main_t * vm, vlib_node_runtime_t * node, vhost_user_intf_t * vui, u32 * current_config_index, u32 * next_index, u32 ** to_next, u32 * n_left_to_next) { vnet_feature_main_t *fm = &feature_main; u8 feature_arc_idx = fm->device_input_feature_arc_index; if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index))) { vnet_feature_config_main_t *cm; cm = &fm->feature_config_mains[feature_arc_idx]; *current_config_index = vec_elt (cm->config_index_by_sw_if_index, vui->sw_if_index); vnet_get_config_data (&cm->config_main, current_config_index, next_index, 0); } vlib_get_new_next_frame (vm, node, *next_index, *to_next, *n_left_to_next); if (*next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT) { /* give some hints to ethernet-input */ vlib_next_frame_t *nf; vlib_frame_t *f; ethernet_input_frame_t *ef; nf = vlib_node_runtime_get_next_frame (vm, node, *next_index); f = vlib_get_frame (vm, nf->frame); f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX; ef = vlib_frame_scalar_args (f); ef->sw_if_index = vui->sw_if_index; ef->hw_if_index = vui->hw_if_index; vlib_frame_no_append (f); } } static_always_inline u32 vhost_user_if_input (vlib_main_t *vm, vhost_user_main_t *vum, vhost_user_intf_t *vui, u16 qid, vlib_node_runtime_t *node, u8 enable_csum) { vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; vnet_feature_main_t *fm = &feature_main; u16 n_rx_packets = 0; u32 n_rx_bytes = 0; u16 n_left; u32 n_left_to_next, *to_next; u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; u32 n_trace = vlib_get_trace_count (vm, node); u32 buffer_data_size = vlib_buffer_get_default_data_size (vm); u32 map_hint = 0; vhost_cpu_t *cpu = &vum->cpus[vm->thread_index]; u16 copy_len = 0; u8 feature_arc_idx = fm->device_input_feature_arc_index; u32 current_config_index = ~(u32) 0; u16 mask = txvq->qsz_mask; /* The descriptor table is not ready yet */ if (PREDICT_FALSE (txvq->avail == 0)) goto done; { /* do we have pending interrupts ? */ vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)]; vhost_user_input_do_interrupt (vm, vui, txvq, rxvq); } /* * For adaptive mode, it is optimized to reduce interrupts. * If the scheduler switches the input node to polling due * to burst of traffic, we tell the driver no interrupt. * When the traffic subsides, the scheduler switches the node back to * interrupt mode. We must tell the driver we want interrupt. */ if (PREDICT_FALSE (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) { if ((node->flags & VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) || !(node->flags & VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE)) /* Tell driver we want notification */ txvq->used->flags = 0; else /* Tell driver we don't want notification */ txvq->used->flags = VRING_USED_F_NO_NOTIFY; } if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE)) goto done; n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx); /* nothing to do */ if (PREDICT_FALSE (n_left == 0)) goto done; if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled))) { /* * Discard input packet if interface is admin down or vring is not * enabled. * "For example, for a networking device, in the disabled state * client must not supply any new RX packets, but must process * and discard any TX packets." */ vhost_user_rx_discard_packet (vm, vui, txvq, VHOST_USER_DOWN_DISCARD_COUNT); goto done; } if (PREDICT_FALSE (n_left == (mask + 1))) { /* * Informational error logging when VPP is not * receiving packets fast enough. */ vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1); } if (n_left > VLIB_FRAME_SIZE) n_left = VLIB_FRAME_SIZE; /* * For small packets (<2kB), we will not need more than one vlib buffer * per packet. In case packets are bigger, we will just yield at some point * in the loop and come back later. This is not an issue as for big packet, * processing cost really comes from the memory copy. * The assumption is that big packets will fit in 40 buffers. */ if (PREDICT_FALSE (cpu->rx_buffers_len < n_left + 1 || cpu->rx_buffers_len < 40)) { u32 curr_len = cpu->rx_buffers_len; cpu->rx_buffers_len += vlib_buffer_alloc (vm, cpu->rx_buffers + curr_len, VHOST_USER_RX_BUFFERS_N - curr_len); if (PREDICT_FALSE (cpu->rx_buffers_len < VHOST_USER_RX_BUFFER_STARVATION)) { /* In case of buffer starvation, discard some packets from the queue * and log the event. * We keep doing best effort for the remaining packets. */ u32 flush = (n_left + 1 > cpu->rx_buffers_len) ? n_left + 1 - cpu->rx_buffers_len : 1; flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush); n_left -= flush; vlib_increment_simple_counter (vnet_main. interface_main.sw_if_counters + VNET_INTERFACE_COUNTER_DROP, vm->thread_index, vui->sw_if_index, flush); vlib_error_count (vm, vhost_user_input_node.index, VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush); } } vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index, &next_index, &to_next, &n_left_to_next); u16 last_avail_idx = txvq->last_avail_idx; u16 last_used_idx = txvq->last_used_idx; while (n_left > 0) { vlib_buffer_t *b_head, *b_current; u32 bi_current; u16 desc_current; u32 desc_data_offset; vnet_virtio_vring_desc_t *desc_table = txvq->desc; if (PREDICT_FALSE (cpu->rx_buffers_len <= 1)) { /* Not enough rx_buffers * Note: We yeld on 1 so we don't need to do an additional * check for the next buffer prefetch. */ n_left = 0; break; } desc_current = txvq->avail->ring[last_avail_idx & mask]; cpu->rx_buffers_len--; bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; b_head = b_current = vlib_get_buffer (vm, bi_current); to_next[0] = bi_current; //We do that now so we can forget about bi_current to_next++; n_left_to_next--; vlib_prefetch_buffer_with_index (vm, cpu->rx_buffers[cpu->rx_buffers_len - 1], LOAD); /* Just preset the used descriptor id and length for later */ txvq->used->ring[last_used_idx & mask].id = desc_current; txvq->used->ring[last_used_idx & mask].len = 0; vhost_user_log_dirty_ring (vui, txvq, ring[last_used_idx & mask]); /* The buffer should already be initialized */ b_head->total_length_not_including_first_buffer = 0; b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; if (PREDICT_FALSE (n_trace > 0 && vlib_trace_buffer (vm, node, next_index, b_head, /* follow_chain */ 0))) { vhost_trace_t *t0 = vlib_add_trace (vm, node, b_head, sizeof (t0[0])); vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx); n_trace--; vlib_set_trace_count (vm, node, n_trace); } /* This depends on the setup but is very consistent * So I think the CPU branch predictor will make a pretty good job * at optimizing the decision. */ if (txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT) { desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr, &map_hint); desc_current = 0; if (PREDICT_FALSE (desc_table == 0)) { vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); goto out; } } desc_data_offset = vui->virtio_net_hdr_sz; if (enable_csum) { vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; u8 *b_data; u16 current; hdr = map_guest_mem (vui, desc_table[desc_current].addr, &map_hint); if (PREDICT_FALSE (hdr == 0)) { vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); goto out; } if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { if ((desc_data_offset == desc_table[desc_current].len) && (desc_table[desc_current].flags & VRING_DESC_F_NEXT)) { current = desc_table[desc_current].next; b_data = map_guest_mem (vui, desc_table[current].addr, &map_hint); if (PREDICT_FALSE (b_data == 0)) { vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); goto out; } } else b_data = (u8 *) hdr + desc_data_offset; vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr); } } while (1) { /* Get more input if necessary. Or end of packet. */ if (desc_data_offset == desc_table[desc_current].len) { if (PREDICT_FALSE (desc_table[desc_current].flags & VRING_DESC_F_NEXT)) { desc_current = desc_table[desc_current].next; desc_data_offset = 0; } else { goto out; } } /* Get more output if necessary. Or end of packet. */ if (PREDICT_FALSE (b_current->current_length == buffer_data_size)) { if (PREDICT_FALSE (cpu->rx_buffers_len == 0)) { /* Cancel speculation */ to_next--; n_left_to_next++; /* * Checking if there are some left buffers. * If not, just rewind the used buffers and stop. * Note: Scheduled copies are not cancelled. This is * not an issue as they would still be valid. Useless, * but valid. */ vhost_user_input_rewind_buffers (vm, cpu, b_head); n_left = 0; goto stop; } /* Get next output */ cpu->rx_buffers_len--; u32 bi_next = cpu->rx_buffers[cpu->rx_buffers_len]; b_current->next_buffer = bi_next; b_current->flags |= VLIB_BUFFER_NEXT_PRESENT; bi_current = bi_next; b_current = vlib_get_buffer (vm, bi_current); } /* Prepare a copy order executed later for the data */ ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N); vhost_copy_t *cpy = &cpu->copy[copy_len]; copy_len++; u32 desc_data_l = desc_table[desc_current].len - desc_data_offset; cpy->len = buffer_data_size - b_current->current_length; cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len; cpy->dst = (uword) (vlib_buffer_get_current (b_current) + b_current->current_length); cpy->src = desc_table[desc_current].addr + desc_data_offset; desc_data_offset += cpy->len; b_current->current_length += cpy->len; b_head->total_length_not_including_first_buffer += cpy->len; } out: n_rx_bytes += b_head->total_length_not_including_first_buffer; n_rx_packets++; b_head->total_length_not_including_first_buffer -= b_head->current_length; /* consume the descriptor and return it as used */ last_avail_idx++; last_used_idx++; vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index; vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0; b_head->error = 0; if (current_config_index != ~(u32) 0) { b_head->current_config_index = current_config_index; vnet_buffer (b_head)->feature_arc_index = feature_arc_idx; } n_left--; /* * Although separating memory copies from virtio ring parsing * is beneficial, we can offer to perform the copies from time * to time in order to free some space in the ring. */ if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD)) { if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len, &map_hint))) { vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); } copy_len = 0; /* give buffers back to driver */ CLIB_MEMORY_STORE_BARRIER (); txvq->used->idx = last_used_idx; vhost_user_log_dirty_ring (vui, txvq, idx); } } stop: vlib_put_next_frame (vm, node, next_index, n_left_to_next); txvq->last_used_idx = last_used_idx; txvq->last_avail_idx = last_avail_idx; /* Do the memory copies */ if (PREDICT_FALSE (vhost_user_input_copy (vui, cpu->copy, copy_len, &map_hint))) { vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); } /* give buffers back to driver */ CLIB_MEMORY_STORE_BARRIER (); txvq->used->idx = txvq->last_used_idx; vhost_user_log_dirty_ring (vui, txvq, idx); /* interrupt (call) handling */ if ((txvq->callfd_idx != ~0) && !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) { txvq->n_since_last_int += n_rx_packets; if (txvq->n_since_last_int > vum->coalesce_frames) vhost_user_send_call (vm, vui, txvq); } /* increase rx counters */ vlib_increment_combined_counter (vnet_main.interface_main.combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index, n_rx_packets, n_rx_bytes); vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets); done: return n_rx_packets; } static_always_inline void vhost_user_mark_desc_consumed (vhost_user_intf_t * vui, vhost_user_vring_t * txvq, u16 desc_head, u16 n_descs_processed) { vnet_virtio_vring_packed_desc_t *desc_table = txvq->packed_desc; u16 desc_idx; u16 mask = txvq->qsz_mask; for (desc_idx = 0; desc_idx < n_descs_processed; desc_idx++) { if (txvq->used_wrap_counter) desc_table[(desc_head + desc_idx) & mask].flags |= (VRING_DESC_F_AVAIL | VRING_DESC_F_USED); else desc_table[(desc_head + desc_idx) & mask].flags &= ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED); vhost_user_advance_last_used_idx (txvq); } } static_always_inline void vhost_user_rx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui, u16 qid, vhost_user_vring_t * txvq, u16 desc_current) { vhost_user_main_t *vum = &vhost_user_main; vnet_virtio_vring_packed_desc_t *hdr_desc; vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; u32 hint = 0; clib_memset (t, 0, sizeof (*t)); t->device_index = vui - vum->vhost_user_interfaces; t->qid = qid; hdr_desc = &txvq->packed_desc[desc_current]; if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT) { t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; /* Header is the first here */ hdr_desc = map_guest_mem (vui, txvq->packed_desc[desc_current].addr, &hint); } if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; if (!(txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) && !(txvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT)) t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; t->first_desc_len = hdr_desc ? hdr_desc->len : 0; if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint))) t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR; else { u32 len = vui->virtio_net_hdr_sz; clib_memcpy_fast (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len); } } static_always_inline u32 vhost_user_rx_discard_packet_packed (vlib_main_t * vm, vhost_user_intf_t * vui, vhost_user_vring_t * txvq, u32 discard_max) { u32 discarded_packets = 0; u16 mask = txvq->qsz_mask; u16 desc_current, desc_head; desc_head = desc_current = txvq->last_used_idx & mask; /* * On the RX side, each packet corresponds to one descriptor * (it is the same whether it is a shallow descriptor, chained, or indirect). * Therefore, discarding a packet is like discarding a descriptor. */ while ((discarded_packets != discard_max) && vhost_user_packed_desc_available (txvq, desc_current)) { vhost_user_advance_last_avail_idx (txvq); discarded_packets++; desc_current = (desc_current + 1) & mask; } if (PREDICT_TRUE (discarded_packets)) vhost_user_mark_desc_consumed (vui, txvq, desc_head, discarded_packets); return (discarded_packets); } static_always_inline u32 vhost_user_input_copy_packed (vhost_user_intf_t * vui, vhost_copy_t * cpy, u16 copy_len, u32 * map_hint) { void *src0, *src1, *src2, *src3, *src4, *src5, *src6, *src7; u8 bad; u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR; if (PREDICT_TRUE (copy_len >= 8)) { src4 = map_guest_mem (vui, cpy[0].src, map_hint); src5 = map_guest_mem (vui, cpy[1].src, map_hint); src6 = map_guest_mem (vui, cpy[2].src, map_hint); src7 = map_guest_mem (vui, cpy[3].src, map_hint); bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0); if (PREDICT_FALSE (bad)) goto one_by_one; clib_prefetch_load (src4); clib_prefetch_load (src5); clib_prefetch_load (src6); clib_prefetch_load (src7); while (PREDICT_TRUE (copy_len >= 8)) { src0 = src4; src1 = src5; src2 = src6; src3 = src7; src4 = map_guest_mem (vui, cpy[4].src, map_hint); src5 = map_guest_mem (vui, cpy[5].src, map_hint); src6 = map_guest_mem (vui, cpy[6].src, map_hint); src7 = map_guest_mem (vui, cpy[7].src, map_hint); bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0); if (PREDICT_FALSE (bad)) break; clib_prefetch_load (src4); clib_prefetch_load (src5); clib_prefetch_load (src6); clib_prefetch_load (src7); clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len); clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len); clib_memcpy_fast ((void *) cpy[2].dst, src2, cpy[2].len); clib_memcpy_fast ((void *) cpy[3].dst, src3, cpy[3].len); copy_len -= 4; cpy += 4; } } one_by_one: while (copy_len) { if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint)))) { rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL; break; } clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len); copy_len -= 1; cpy += 1; } return rc; } static_always_inline u32 vhost_user_do_offload (vhost_user_intf_t *vui, vnet_virtio_vring_packed_desc_t *desc_table, u16 desc_current, u16 mask, vlib_buffer_t *b_head, u32 *map_hint) { u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR; vnet_virtio_net_hdr_mrg_rxbuf_t *hdr; u8 *b_data; u32 desc_data_offset = vui->virtio_net_hdr_sz; hdr = map_guest_mem (vui, desc_table[desc_current].addr, map_hint); if (PREDICT_FALSE (hdr == 0)) rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL; else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { if (desc_data_offset == desc_table[desc_current].len) { desc_current = (desc_current + 1) & mask; b_data = map_guest_mem (vui, desc_table[desc_current].addr, map_hint); if (PREDICT_FALSE (b_data == 0)) rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL; else vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr); } else { b_data = (u8 *) hdr + desc_data_offset; vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr); } } return rc; } static_always_inline u32 vhost_user_compute_buffers_required (u32 desc_len, u32 buffer_data_size) { div_t result; u32 buffers_required; if (PREDICT_TRUE (buffer_data_size == 2048)) { buffers_required = desc_len >> 11; if ((desc_len & 2047) != 0) buffers_required++; return (buffers_required); } if (desc_len < buffer_data_size) return 1; result = div (desc_len, buffer_data_size); if (result.rem) buffers_required = result.quot + 1; else buffers_required = result.quot; return (buffers_required); } static_always_inline u32 vhost_user_compute_indirect_desc_len (vhost_user_intf_t * vui, vhost_user_vring_t * txvq, u32 buffer_data_size, u16 desc_current, u32 * map_hint) { vnet_virtio_vring_packed_desc_t *desc_table = txvq->packed_desc; u32 desc_len = 0; u16 desc_data_offset = vui->virtio_net_hdr_sz; u16 desc_idx = desc_current; u32 n_descs; n_descs = desc_table[desc_idx].len >> 4; desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, map_hint); if (PREDICT_FALSE (desc_table == 0)) return 0; for (desc_idx = 0; desc_idx < n_descs; desc_idx++) desc_len += desc_table[desc_idx].len; if (PREDICT_TRUE (desc_len > desc_data_offset)) desc_len -= desc_data_offset; return vhost_user_compute_buffers_required (desc_len, buffer_data_size); } static_always_inline u32 vhost_user_compute_chained_desc_len (vhost_user_intf_t * vui, vhost_user_vring_t * txvq, u32 buffer_data_size, u16 * current, u16 * n_left) { vnet_virtio_vring_packed_desc_t *desc_table = txvq->packed_desc; u32 desc_len = 0; u16 mask = txvq->qsz_mask; while (desc_table[*current].flags & VRING_DESC_F_NEXT) { desc_len += desc_table[*current].len; (*n_left)++; *current = (*current + 1) & mask; vhost_user_advance_last_avail_idx (txvq); } desc_len += desc_table[*current].len; (*n_left)++; *current = (*current + 1) & mask; vhost_user_advance_last_avail_idx (txvq); if (PREDICT_TRUE (desc_len > vui->virtio_net_hdr_sz)) desc_len -= vui->virtio_net_hdr_sz; return vhost_user_compute_buffers_required (desc_len, buffer_data_size); } static_always_inline void vhost_user_assemble_packet (vnet_virtio_vring_packed_desc_t *desc_table, u16 *desc_idx, vlib_buffer_t *b_head, vlib_buffer_t **b_current, u32 **next, vlib_buffer_t ***b, u32 *bi_current, vhost_cpu_t *cpu, u16 *copy_len, u32 *buffers_used, u32 buffers_required, u32 *desc_data_offset, u32 buffer_data_size, u16 mask) { u32 desc_data_l; while (*desc_data_offset < desc_table[*desc_idx].len) { /* Get more output if necessary. Or end of packet. */ if (PREDICT_FALSE ((*b_current)->current_length == buffer_data_size)) { /* Get next output */ u32 bi_next = **next; (*next)++; (*b_current)->next_buffer = bi_next; (*b_current)->flags |= VLIB_BUFFER_NEXT_PRESENT; *bi_current = bi_next; *b_current = **b; (*b)++; (*buffers_used)++; ASSERT (*buffers_used <= buffers_required); } /* Prepare a copy order executed later for the data */ ASSERT (*copy_len < VHOST_USER_COPY_ARRAY_N); vhost_copy_t *cpy = &cpu->copy[*copy_len]; (*copy_len)++; desc_data_l = desc_table[*desc_idx].len - *desc_data_offset; cpy->len = buffer_data_size - (*b_current)->current_length; cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len; cpy->dst = (uword) (vlib_buffer_get_current (*b_current) + (*b_current)->current_length); cpy->src = desc_table[*desc_idx].addr + *desc_data_offset; *desc_data_offset += cpy->len; (*b_current)->current_length += cpy->len; b_head->total_length_not_including_first_buffer += cpy->len; } *desc_idx = (*desc_idx + 1) & mask;; *desc_data_offset = 0; } static_always_inline u32 vhost_user_if_input_packed (vlib_main_t *vm, vhost_user_main_t *vum, vhost_user_intf_t *vui, u16 qid, vlib_node_runtime_t *node, u8 enable_csum) { vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; vnet_feature_main_t *fm = &feature_main; u8 feature_arc_idx = fm->device_input_feature_arc_index; u16 n_rx_packets = 0; u32 n_rx_bytes = 0; u16 n_left = 0; u32 buffers_required = 0; u32 n_left_to_next, *to_next; u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; u32 n_trace = vlib_get_trace_count (vm, node); u32 buffer_data_size = vlib_buffer_get_default_data_size (vm); u32 map_hint = 0; vhost_cpu_t *cpu = &vum->cpus[vm->thread_index]; u16 copy_len = 0; u32 current_config_index = ~0; u16 mask = txvq->qsz_mask; u16 desc_current, desc_head, last_used_idx; vnet_virtio_vring_packed_desc_t *desc_table = 0; u32 n_descs_processed = 0; u32 rv; vlib_buffer_t **b; u32 *next; u32 buffers_used = 0; u16 current, n_descs_to_process; /* The descriptor table is not ready yet */ if (PREDICT_FALSE (txvq->packed_desc == 0)) goto done; /* do we have pending interrupts ? */ vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)]; vhost_user_input_do_interrupt (vm, vui, txvq, rxvq); /* * For adaptive mode, it is optimized to reduce interrupts. * If the scheduler switches the input node to polling due * to burst of traffic, we tell the driver no interrupt. * When the traffic subsides, the scheduler switches the node back to * interrupt mode. We must tell the driver we want interrupt. */ if (PREDICT_FALSE (txvq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE)) { if ((node->flags & VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) || !(node->flags & VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE)) /* Tell driver we want notification */ txvq->used_event->flags = 0; else /* Tell driver we don't want notification */ txvq->used_event->flags = VRING_EVENT_F_DISABLE; } last_used_idx = txvq->last_used_idx & mask; desc_head = desc_current = last_used_idx; if (vhost_user_packed_desc_available (txvq, desc_current) == 0) goto done; if (PREDICT_FALSE (!vui->admin_up || !vui->is_ready || !(txvq->enabled))) { /* * Discard input packet if interface is admin down or vring is not * enabled. * "For example, for a networking device, in the disabled state * client must not supply any new RX packets, but must process * and discard any TX packets." */ rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, VHOST_USER_DOWN_DISCARD_COUNT); vlib_error_count (vm, vhost_user_input_node.index, VHOST_USER_INPUT_FUNC_ERROR_NOT_READY, rv); goto done; } vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index, &next_index, &to_next, &n_left_to_next); /* * Compute n_left and total buffers needed */ desc_table = txvq->packed_desc; current = desc_current; while (vhost_user_packed_desc_available (txvq, current) && (n_left < VLIB_FRAME_SIZE)) { if (desc_table[current].flags & VRING_DESC_F_INDIRECT) { buffers_required += vhost_user_compute_indirect_desc_len (vui, txvq, buffer_data_size, current, &map_hint); n_left++; current = (current + 1) & mask; vhost_user_advance_last_avail_idx (txvq); } else { buffers_required += vhost_user_compute_chained_desc_len (vui, txvq, buffer_data_size, ¤t, &n_left); } } /* Something is broken if we need more than 10000 buffers */ if (PREDICT_FALSE ((buffers_required == 0) || (buffers_required > 10000))) { rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left); vlib_error_count (vm, vhost_user_input_node.index, VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv); goto done; } vec_validate (cpu->to_next_list, buffers_required); rv = vlib_buffer_alloc (vm, cpu->to_next_list, buffers_required); if (PREDICT_FALSE (rv != buffers_required)) { vlib_buffer_free (vm, cpu->to_next_list, rv); rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left); vlib_error_count (vm, vhost_user_input_node.index, VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv); goto done; } next = cpu->to_next_list; vec_validate (cpu->rx_buffers_pdesc, buffers_required); vlib_get_buffers (vm, next, cpu->rx_buffers_pdesc, buffers_required); b = cpu->rx_buffers_pdesc; n_descs_processed = n_left; while (n_left) { vlib_buffer_t *b_head, *b_current; u32 bi_current; u32 desc_data_offset; u16 desc_idx = desc_current; u32 n_descs; desc_table = txvq->packed_desc; to_next[0] = bi_current = next[0]; b_head = b_current = b[0]; b++; buffers_used++; ASSERT (buffers_used <= buffers_required); to_next++; next++; n_left_to_next--; /* The buffer should already be initialized */ b_head->total_length_not_including_first_buffer = 0; b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; desc_data_offset = vui->virtio_net_hdr_sz; n_descs_to_process = 1; if (desc_table[desc_idx].flags & VRING_DESC_F_INDIRECT) { n_descs = desc_table[desc_idx].len >> 4; desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, &map_hint); desc_idx = 0; if (PREDICT_FALSE (desc_table == 0) || (enable_csum && (PREDICT_FALSE (vhost_user_do_offload (vui, desc_table, desc_idx, mask, b_head, &map_hint) != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)))) { vlib_error_count (vm, node->node_index, VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); to_next--; next--; n_left_to_next++; buffers_used--; b--; goto out; } while (n_descs) { vhost_user_assemble_packet (desc_table, &desc_idx, b_head, &b_current, &next, &b, &bi_current, cpu, ©_len, &buffers_used, buffers_required, &desc_data_offset, buffer_data_size, mask); n_descs--; } } else { if (enable_csum) { rv = vhost_user_do_offload (vui, desc_table, desc_idx, mask, b_head, &map_hint); if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)) { vlib_error_count (vm, node->node_index, rv, 1); to_next--; next--; n_left_to_next++; buffers_used--; b--; goto out; } } /* * For chained descriptor, we process all chains in a single while * loop. So count how many descriptors in the chain. */ n_descs_to_process = 1; while (desc_table[desc_idx].flags & VRING_DESC_F_NEXT) { vhost_user_assemble_packet (desc_table, &desc_idx, b_head, &b_current, &next, &b, &bi_current, cpu, ©_len, &buffers_used, buffers_required, &desc_data_offset, buffer_data_size, mask); n_descs_to_process++; } vhost_user_assemble_packet (desc_table, &desc_idx, b_head, &b_current, &next, &b, &bi_current, cpu, ©_len, &buffers_used, buffers_required, &desc_data_offset, buffer_data_size, mask); } n_rx_bytes += b_head->total_length_not_including_first_buffer; n_rx_packets++; b_head->total_length_not_including_first_buffer -= b_head->current_length; vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index; vnet_buffer (b_head)->sw_if_index[VLIB_TX] = ~0; b_head->error = 0; if (current_config_index != ~0) { b_head->current_config_index = current_config_index; vnet_buffer (b_head)->feature_arc_index = feature_arc_idx; } out: ASSERT (n_left >= n_descs_to_process); n_left -= n_descs_to_process; /* advance to next descrptor */ desc_current = (desc_current + n_descs_to_process) & mask; /* * Although separating memory copies from virtio ring parsing * is beneficial, we can offer to perform the copies from time * to time in order to free some space in the ring. */ if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD)) { rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, &map_hint); if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)) vlib_error_count (vm, node->node_index, rv, 1); copy_len = 0; } } vlib_put_next_frame (vm, node, next_index, n_left_to_next); /* Do the memory copies */ rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, &map_hint); if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR)) vlib_error_count (vm, node->node_index, rv, 1); /* Must do the tracing before giving buffers back to driver */ if (PREDICT_FALSE (n_trace)) { u32 left = n_rx_packets; b = cpu->rx_buffers_pdesc; while (n_trace && left) { if (PREDICT_TRUE (vlib_trace_buffer (vm, node, next_index, b[0], /* follow_chain */ 0))) { vhost_trace_t *t0; t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0])); vhost_user_rx_trace_packed (t0, vui, qid, txvq, last_used_idx); last_used_idx = (last_used_idx + 1) & mask; n_trace--; vlib_set_trace_count (vm, node, n_trace); } left--; b++; } } /* * Give buffers back to driver. */ vhost_user_mark_desc_consumed (vui, txvq, desc_head, n_descs_processed); /* interrupt (call) handling */ if ((txvq->callfd_idx != ~0) && (txvq->avail_event->flags != VRING_EVENT_F_DISABLE)) { txvq->n_since_last_int += n_rx_packets; if (txvq->n_since_last_int > vum->coalesce_frames) vhost_user_send_call (vm, vui, txvq); } /* increase rx counters */ vlib_increment_combined_counter (vnet_main.interface_main.combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index, n_rx_packets, n_rx_bytes); vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets); if (PREDICT_FALSE (buffers_used < buffers_required)) vlib_buffer_free (vm, next, buffers_required - buffers_used); done: return n_rx_packets; } VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vhost_user_main_t *vum = &vhost_user_main; uword n_rx_packets = 0; vhost_user_intf_t *vui; vnet_hw_if_rxq_poll_vector_t *pv = vnet_hw_if_get_rxq_poll_vector (vm, node); vnet_hw_if_rxq_poll_vector_t *pve; vec_foreach (pve, pv) { vui = pool_elt_at_index (vum->vhost_user_interfaces, pve->dev_instance); if (vhost_user_is_packed_ring_supported (vui)) { if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM)) n_rx_packets += vhost_user_if_input_packed ( vm, vum, vui, pve->queue_id, node, 1); else n_rx_packets += vhost_user_if_input_packed ( vm, vum, vui, pve->queue_id, node, 0); } else { if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM)) n_rx_packets += vhost_user_if_input (vm, vum, vui, pve->queue_id, node, 1); else n_rx_packets += vhost_user_if_input (vm, vum, vui, pve->queue_id, node, 0); } } return n_rx_packets; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (vhost_user_input_node) = { .type = VLIB_NODE_TYPE_INPUT, .name = "vhost-user-input", .sibling_of = "device-input", .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED, /* Will be enabled if/when hardware is detected. */ .state = VLIB_NODE_STATE_DISABLED, .format_buffer = format_ethernet_header_with_length, .format_trace = format_vhost_trace, .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR, .error_strings = vhost_user_input_func_error_strings, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */