1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::mem;
use std::net::Ipv4Addr;
use std::os::unix::io::{AsRawFd, RawFd};
use std::sync::Arc;
use std::sync::atomic::AtomicUsize;
use std::thread::spawn;
use net_sys;
use net_util::Tap;
use sys_util::{EventFd, GuestMemory};
use vhost::Net as VhostNetHandle;
use vhost::net::NetT;
use virtio_sys::{vhost, virtio_net};
use super::{Error, Result};
use super::super::{Queue, VirtioDevice, TYPE_NET};
use super::worker::Worker;
const QUEUE_SIZE: u16 = 256;
const NUM_QUEUES: usize = 2;
const QUEUE_SIZES: &'static [u16] = &[QUEUE_SIZE; NUM_QUEUES];
pub struct Net {
workers_kill_evt: Option<EventFd>,
kill_evt: EventFd,
tap: Option<Tap>,
vhost_net_handle: Option<VhostNetHandle>,
vhost_interrupt: Option<EventFd>,
avail_features: u64,
acked_features: u64,
}
impl Net {
/// Create a new virtio network device with the given IP address and
/// netmask.
pub fn new(ip_addr: Ipv4Addr, netmask: Ipv4Addr, mem: &GuestMemory) -> Result<Net> {
let kill_evt = EventFd::new().map_err(Error::CreateKillEventFd)?;
let tap = Tap::new().map_err(Error::TapOpen)?;
tap.set_ip_addr(ip_addr).map_err(Error::TapSetIp)?;
tap.set_netmask(netmask).map_err(Error::TapSetNetmask)?;
// Set offload flags to match the virtio features below.
tap.set_offload(
net_sys::TUN_F_CSUM | net_sys::TUN_F_UFO | net_sys::TUN_F_TSO4 | net_sys::TUN_F_TSO6,
).map_err(Error::TapSetOffload)?;
// We declare VIRTIO_NET_F_MRG_RXBUF, so set the vnet hdr size to match.
let vnet_hdr_size = mem::size_of::<virtio_net::virtio_net_hdr_mrg_rxbuf>() as i32;
tap.set_vnet_hdr_size(vnet_hdr_size).map_err(Error::TapSetVnetHdrSize)?;
tap.enable().map_err(Error::TapEnable)?;
let vhost_net_handle = VhostNetHandle::new(mem).map_err(Error::VhostOpen)?;
let avail_features =
1 << virtio_net::VIRTIO_NET_F_GUEST_CSUM | 1 << virtio_net::VIRTIO_NET_F_CSUM |
1 << virtio_net::VIRTIO_NET_F_GUEST_TSO4 |
1 << virtio_net::VIRTIO_NET_F_GUEST_UFO |
1 << virtio_net::VIRTIO_NET_F_HOST_TSO4 |
1 << virtio_net::VIRTIO_NET_F_HOST_UFO |
1 << virtio_net::VIRTIO_NET_F_MRG_RXBUF |
1 << vhost::VIRTIO_RING_F_INDIRECT_DESC |
1 << vhost::VIRTIO_RING_F_EVENT_IDX |
1 << vhost::VIRTIO_F_NOTIFY_ON_EMPTY | 1 << vhost::VIRTIO_F_VERSION_1;
Ok(Net {
workers_kill_evt: Some(kill_evt.try_clone().map_err(Error::CloneKillEventFd)?),
kill_evt: kill_evt,
tap: Some(tap),
vhost_net_handle: Some(vhost_net_handle),
vhost_interrupt: Some(EventFd::new().map_err(Error::VhostIrqCreate)?),
avail_features: avail_features,
acked_features: 0u64,
})
}
}
impl Drop for Net {
fn drop(&mut self) {
// Only kill the child if it claimed its eventfd.
if self.workers_kill_evt.is_none() {
// Ignore the result because there is nothing we can do about it.
let _ = self.kill_evt.write(1);
}
}
}
impl VirtioDevice for Net {
fn keep_fds(&self) -> Vec<RawFd> {
let mut keep_fds = Vec::new();
if let Some(ref tap) = self.tap {
keep_fds.push(tap.as_raw_fd());
}
if let Some(ref vhost_net_handle) = self.vhost_net_handle {
keep_fds.push(vhost_net_handle.as_raw_fd());
}
if let Some(ref vhost_interrupt) = self.vhost_interrupt {
keep_fds.push(vhost_interrupt.as_raw_fd());
}
if let Some(ref workers_kill_evt) = self.workers_kill_evt {
keep_fds.push(workers_kill_evt.as_raw_fd());
}
keep_fds
}
fn device_type(&self) -> u32 {
TYPE_NET
}
fn queue_max_sizes(&self) -> &[u16] {
QUEUE_SIZES
}
fn features(&self, page: u32) -> u32 {
match page {
0 => self.avail_features as u32,
1 => (self.avail_features >> 32) as u32,
_ => {
warn!("net: virtio net got request for features page: {}", page);
0u32
},
}
}
fn ack_features(&mut self, page: u32, value: u32) {
let mut v = match page {
0 => value as u64,
1 => (value as u64) << 32,
_ => {
warn!(
"net: virtio net device cannot ack unknown feature page: {}",
page
);
0u64
},
};
// Check if the guest is ACK'ing a feature that we didn't claim to have.
let unrequested_features = v & !self.avail_features;
if unrequested_features != 0 {
warn!("net: virtio net got unknown feature ack: {:x}", v);
// Don't count these features as acked.
v &= !unrequested_features;
}
self.acked_features |= v;
}
fn activate(
&mut self,
_: GuestMemory,
interrupt_evt: EventFd,
status: Arc<AtomicUsize>,
queues: Vec<Queue>,
queue_evts: Vec<EventFd>,
) {
if queues.len() != NUM_QUEUES || queue_evts.len() != NUM_QUEUES {
error!("net: expected {} queues, got {}", NUM_QUEUES, queues.len());
return;
}
if let Some(vhost_net_handle) = self.vhost_net_handle.take() {
if let Some(tap) = self.tap.take() {
if let Some(vhost_interrupt) = self.vhost_interrupt.take() {
if let Some(kill_evt) = self.workers_kill_evt.take() {
let acked_features = self.acked_features;
spawn(move || {
let mut worker = Worker::new(
queues,
vhost_net_handle,
vhost_interrupt,
status,
interrupt_evt,
acked_features,
);
let activate_vqs = |handle: &VhostNetHandle| -> Result<()> {
for idx in 0..NUM_QUEUES {
handle
.set_backend(idx, &tap)
.map_err(Error::VhostNetSetBackend)?;
}
Ok(())
};
let result =
worker.run(queue_evts, QUEUE_SIZES, kill_evt, activate_vqs);
if let Err(e) = result {
error!("net worker thread exited with error: {:?}", e);
}
});
}
}
}
}
}
}
|