mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
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6d27cfb3b6
In order to provide connectivity through network interface between host and guest, this patch introduces the virtio-net backend. This code is based on Firecracker commit d4a89cdc0bd2867f821e3678328dabad6dd8b767 It is a trimmed down version of the original files as it removes the rate limiter support. It has been ported to support vm-memory crate and the epoll handler has been modified in order to run a dedicated epoll loop from the device itself. This epoll loop runs in its own dedicated thread. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
136 lines
3.4 KiB
Rust
136 lines
3.4 KiB
Rust
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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//
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// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE-BSD-3-Clause file.
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//
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// Copyright © 2019 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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//! Implements virtio devices, queues, and transport mechanisms.
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extern crate epoll;
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#[macro_use]
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extern crate log;
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extern crate pci;
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extern crate virtio_bindings;
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extern crate vm_memory;
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use std::fmt;
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use std::fs::File;
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use std::io;
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mod block;
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mod device;
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pub mod net;
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mod queue;
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pub mod transport;
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pub use self::block::*;
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pub use self::device::*;
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pub use self::net::*;
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pub use self::queue::*;
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const DEVICE_INIT: u32 = 0x00;
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const DEVICE_ACKNOWLEDGE: u32 = 0x01;
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const DEVICE_DRIVER: u32 = 0x02;
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const DEVICE_DRIVER_OK: u32 = 0x04;
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const DEVICE_FEATURES_OK: u32 = 0x08;
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const DEVICE_FAILED: u32 = 0x80;
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#[allow(dead_code)]
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const VIRTIO_F_VERSION_1: u32 = 32;
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// Types taken from linux/virtio_ids.h
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#[derive(Copy, Clone)]
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#[allow(dead_code)]
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#[allow(non_camel_case_types)]
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#[repr(C)]
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enum VirtioDeviceType {
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TYPE_NET = 1,
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TYPE_BLOCK = 2,
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TYPE_RNG = 4,
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TYPE_BALLOON = 5,
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TYPE_9P = 9,
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TYPE_GPU = 16,
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TYPE_INPUT = 18,
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TYPE_VSOCK = 19,
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}
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// In order to use the `{}` marker, the trait `fmt::Display` must be implemented
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// manually for the type VirtioDeviceType.
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impl fmt::Display for VirtioDeviceType {
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// This trait requires `fmt` with this exact signature.
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let output = match *self {
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VirtioDeviceType::TYPE_NET => "net",
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VirtioDeviceType::TYPE_BLOCK => "block",
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VirtioDeviceType::TYPE_RNG => "rng",
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VirtioDeviceType::TYPE_BALLOON => "balloon",
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VirtioDeviceType::TYPE_GPU => "gpu",
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VirtioDeviceType::TYPE_9P => "9p",
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VirtioDeviceType::TYPE_VSOCK => "vsock",
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_ => return Err(std::fmt::Error),
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};
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write!(f, "{}", output)
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}
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}
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#[allow(dead_code)]
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const INTERRUPT_STATUS_USED_RING: u32 = 0x1;
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#[allow(dead_code)]
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const INTERRUPT_STATUS_CONFIG_CHANGED: u32 = 0x2;
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#[derive(Debug)]
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pub enum ActivateError {
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EpollCtl(std::io::Error),
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BadActivate,
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#[cfg(feature = "vsock")]
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BadVhostActivate(self::vhost::Error),
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}
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pub type ActivateResult = std::result::Result<(), ActivateError>;
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pub type DeviceEventT = u16;
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/// The payload is used to handle events where the internal state of the VirtIO device
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/// needs to be changed.
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#[allow(clippy::large_enum_variant)]
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pub enum EpollHandlerPayload {
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/// DrivePayload(disk_image)
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DrivePayload(File),
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/// Events that do not need a payload.
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Empty,
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}
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type Result<T> = std::result::Result<T, Error>;
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pub trait EpollHandler: Send {
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fn handle_event(
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&mut self,
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device_event: DeviceEventT,
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event_flags: u32,
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payload: EpollHandlerPayload,
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) -> Result<()>;
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}
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#[derive(Debug)]
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pub enum Error {
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FailedReadingQueue {
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event_type: &'static str,
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underlying: io::Error,
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},
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FailedReadTap,
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FailedSignalingUsedQueue(io::Error),
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PayloadExpected,
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UnknownEvent {
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device: &'static str,
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event: DeviceEventT,
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},
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IoError(io::Error),
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EpollCreateFd(io::Error),
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EpollCtl(io::Error),
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EpollWait(io::Error),
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}
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