+++ /dev/null
-/*
- *------------------------------------------------------------------
- * 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 <vnet/devices/virtio/vhost_user.h>
-#include <vnet/devices/virtio/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:
- */
Code Review / vpp.git / blobdiff