diff options
Diffstat (limited to 'src/plugins/vhost/vhost_user_input.c')
| -rw-r--r-- | src/plugins/vhost/vhost_user_input.c | 1474 |
1 files changed, 1474 insertions, 0 deletions
diff --git a/src/plugins/vhost/vhost_user_input.c b/src/plugins/vhost/vhost_user_input.c new file mode 100644 index 00000000000..c083f43ba7c --- /dev/null +++ b/src/plugins/vhost/vhost_user_input.c @@ -0,0 +1,1474 @@ +/* + *------------------------------------------------------------------ + * 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 <fcntl.h> /* for open */ +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/uio.h> /* for iovec */ +#include <netinet/in.h> +#include <sys/vfs.h> + +#include <linux/if_arp.h> +#include <linux/if_tun.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> + +#include <vnet/ethernet/ethernet.h> +#include <vnet/devices/devices.h> +#include <vnet/feature/feature.h> +#include <vnet/udp/udp_packet.h> +#include <vnet/tcp/tcp_packet.h> +#include <vnet/interface/rx_queue_funcs.h> + +#include <vhost/vhost_user.h> +#include <vhost/vhost_user_inline.h> + +#include <vnet/ip/ip4_packet.h> +#include <vnet/ip/ip6_packet.h> + +/* + * 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: + */ |