2019-08-28 09:50:48 +00:00
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// Copyright 2019 Intel Corporation. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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use libc;
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use libc::EFD_NONBLOCK;
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use std::cmp;
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use std::io::Write;
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use std::sync::{Arc, RwLock};
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use std::thread;
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use std::vec::Vec;
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use crate::VirtioInterrupt;
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use net_util::{MacAddr, MAC_ADDR_LEN};
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use vm_memory::GuestMemoryMmap;
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use vmm_sys_util::eventfd::EventFd;
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use super::super::{ActivateError, ActivateResult, Queue, VirtioDevice, VirtioDeviceType};
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use super::handler::*;
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use super::vu_common_ctrl::*;
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use super::{Error, Result};
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use vhost_rs::vhost_user::message::VhostUserVirtioFeatures;
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2019-08-30 18:47:24 +00:00
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use vhost_rs::vhost_user::{Master, VhostUserMaster, VhostUserMasterReqHandler};
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2019-08-28 09:50:48 +00:00
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use vhost_rs::VhostBackend;
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2019-09-19 13:42:29 +00:00
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use virtio_bindings::bindings::virtio_net;
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use virtio_bindings::bindings::virtio_ring;
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2019-08-28 09:50:48 +00:00
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2019-08-30 18:47:24 +00:00
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struct SlaveReqHandler {}
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impl VhostUserMasterReqHandler for SlaveReqHandler {}
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2019-08-28 09:50:48 +00:00
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pub struct Net {
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vhost_user_net: Master,
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kill_evt: EventFd,
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avail_features: u64,
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acked_features: u64,
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2019-09-03 08:26:01 +00:00
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backend_features: u64,
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2019-08-28 09:50:48 +00:00
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config_space: Vec<u8>,
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queue_sizes: Vec<u16>,
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}
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2019-09-23 17:42:52 +00:00
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impl Net {
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2019-08-28 09:50:48 +00:00
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/// Create a new vhost-user-net device
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2019-09-23 17:42:52 +00:00
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pub fn new(mac_addr: MacAddr, vu_cfg: VhostUserConfig) -> Result<Net> {
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let mut vhost_user_net = Master::connect(&vu_cfg.sock, vu_cfg.num_queues as u64)
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2019-08-28 09:50:48 +00:00
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.map_err(Error::VhostUserCreateMaster)?;
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let kill_evt = EventFd::new(EFD_NONBLOCK).map_err(Error::CreateKillEventFd)?;
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// Filling device and vring features VMM supports.
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let mut avail_features = 1 << virtio_net::VIRTIO_NET_F_GUEST_CSUM
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| 1 << virtio_net::VIRTIO_NET_F_CSUM
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| 1 << virtio_net::VIRTIO_NET_F_GUEST_TSO4
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| 1 << virtio_net::VIRTIO_NET_F_GUEST_TSO6
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| 1 << virtio_net::VIRTIO_NET_F_GUEST_ECN
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| 1 << virtio_net::VIRTIO_NET_F_GUEST_UFO
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| 1 << virtio_net::VIRTIO_NET_F_HOST_TSO4
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| 1 << virtio_net::VIRTIO_NET_F_HOST_TSO6
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| 1 << virtio_net::VIRTIO_NET_F_HOST_ECN
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| 1 << virtio_net::VIRTIO_NET_F_HOST_UFO
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| 1 << virtio_net::VIRTIO_NET_F_MRG_RXBUF
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| 1 << virtio_net::VIRTIO_F_NOTIFY_ON_EMPTY
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| 1 << virtio_net::VIRTIO_F_VERSION_1
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| 1 << virtio_ring::VIRTIO_RING_F_EVENT_IDX
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| VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
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vhost_user_net
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.set_owner()
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.map_err(Error::VhostUserSetOwner)?;
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// Get features from backend, do negotiation to get a feature collection which
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// both VMM and backend support.
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2019-08-30 21:50:33 +00:00
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let backend_features = vhost_user_net
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.get_features()
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.map_err(Error::VhostUserGetFeatures)?;
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2019-08-28 09:50:48 +00:00
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avail_features &= backend_features;
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// Set features back is required by the vhost crate mechanism, since the
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// later vhost call will check if features is filled in master before execution.
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vhost_user_net
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2019-08-30 18:55:28 +00:00
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.set_features(avail_features)
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2019-08-28 09:50:48 +00:00
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.map_err(Error::VhostUserSetFeatures)?;
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let mut acked_features = 0;
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2019-09-03 08:26:01 +00:00
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if avail_features & VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits() != 0 {
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2019-08-28 09:50:48 +00:00
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acked_features |= VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
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vhost_user_net
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.get_protocol_features()
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.map_err(Error::VhostUserGetProtocolFeatures)?;
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} else {
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return Err(Error::VhostUserProtocolNotSupport);
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}
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let mut config_space = Vec::with_capacity(MAC_ADDR_LEN);
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unsafe { config_space.set_len(MAC_ADDR_LEN) }
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config_space[..].copy_from_slice(mac_addr.get_bytes());
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avail_features |= 1 << virtio_net::VIRTIO_NET_F_MAC;
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// Send set_vring_base here, since it could tell backends, like OVS + DPDK,
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// how many virt queues to be handled, which backend required to know at early stage.
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for i in 0..vu_cfg.num_queues {
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vhost_user_net
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.set_vring_base(i, 0)
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.map_err(Error::VhostUserSetVringBase)?;
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}
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Ok(Net {
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vhost_user_net,
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kill_evt,
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avail_features,
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acked_features,
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2019-09-03 08:26:01 +00:00
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backend_features,
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2019-08-28 09:50:48 +00:00
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config_space,
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queue_sizes: vec![vu_cfg.queue_size; vu_cfg.num_queues],
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})
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}
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}
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impl Drop for Net {
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fn drop(&mut self) {
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if let Err(_e) = self.kill_evt.write(1) {
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error!("failed to kill vhost-user-net with error {}", _e);
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}
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}
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}
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impl VirtioDevice for Net {
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fn device_type(&self) -> u32 {
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VirtioDeviceType::TYPE_NET as u32
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}
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fn queue_max_sizes(&self) -> &[u16] {
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&self.queue_sizes
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}
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fn features(&self, page: u32) -> u32 {
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match page {
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0 => self.avail_features as u32,
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1 => (self.avail_features >> 32) as u32,
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_ => {
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warn!("Received request for unknown features page: {}", page);
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0u32
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}
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}
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}
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fn ack_features(&mut self, page: u32, value: u32) {
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let mut v = match page {
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0 => u64::from(value),
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1 => u64::from(value) << 32,
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_ => {
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warn!("Cannot acknowledge unknown features page: {}", page);
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0u64
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}
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};
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// Check if the guest is ACK'ing a feature that we didn't claim to have.
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let unrequested_features = v & !self.avail_features;
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if unrequested_features != 0 {
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warn!("Received acknowledge request for unknown feature: {:x}", v);
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// Don't count these features as acked.
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v &= !unrequested_features;
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}
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self.acked_features |= v;
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}
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fn read_config(&self, offset: u64, mut data: &mut [u8]) {
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let config_len = self.config_space.len() as u64;
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if offset >= config_len {
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error!("Failed to read config space");
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return;
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}
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if let Some(end) = offset.checked_add(data.len() as u64) {
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// This write can't fail, offset and end are checked against config_len.
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data.write_all(&self.config_space[offset as usize..cmp::min(end, config_len) as usize])
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.unwrap();
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}
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}
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fn write_config(&mut self, offset: u64, data: &[u8]) {
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let data_len = data.len() as u64;
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let config_len = self.config_space.len() as u64;
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if offset + data_len > config_len {
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error!("Failed to write config space");
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return;
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}
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let (_, right) = self.config_space.split_at_mut(offset as usize);
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right.copy_from_slice(&data[..]);
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}
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fn activate(
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&mut self,
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mem: Arc<RwLock<GuestMemoryMmap>>,
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interrupt_cb: Arc<VirtioInterrupt>,
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queues: Vec<Queue>,
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queue_evts: Vec<EventFd>,
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) -> ActivateResult {
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let handler_kill_evt = self
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.kill_evt
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.try_clone()
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.map_err(|_| ActivateError::CloneKillEventFd)?;
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let vu_interrupt_list = setup_vhost_user(
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&mut self.vhost_user_net,
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&mem.read().unwrap(),
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queues,
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queue_evts,
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2019-09-03 08:26:01 +00:00
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self.acked_features & self.backend_features,
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2019-08-28 09:50:48 +00:00
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)
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.map_err(ActivateError::VhostUserNetSetup)?;
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2019-08-30 18:47:24 +00:00
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let mut handler = VhostUserEpollHandler::<SlaveReqHandler>::new(VhostUserEpollConfig {
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2019-08-28 09:50:48 +00:00
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interrupt_cb,
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kill_evt: handler_kill_evt,
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vu_interrupt_list,
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2019-08-30 18:47:24 +00:00
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slave_req_handler: None,
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});
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2019-08-28 09:50:48 +00:00
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2019-08-30 18:47:24 +00:00
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let handler_result = thread::Builder::new()
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2019-08-28 09:50:48 +00:00
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.name("vhost_user_net".to_string())
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.spawn(move || {
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2019-08-30 18:47:24 +00:00
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if let Err(e) = handler.run() {
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error!("net worker thread exited with error {:?}!", e);
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2019-08-28 09:50:48 +00:00
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}
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});
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2019-08-30 18:47:24 +00:00
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if let Err(e) = handler_result {
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error!("vhost-user net thread create failed with error {:?}", e);
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2019-08-28 09:50:48 +00:00
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}
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Ok(())
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}
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}
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