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authorMichele Paolino <m.paolino@virtualopensystems.com>2023-11-14 18:07:09 +0100
committerMichele Paolino <m.paolino@virtualopensystems.com>2023-12-13 10:27:55 +0000
commitb05512b81bbe1c90b71da9c571e742f162fc0575 (patch)
treedea9b67ff4dae3e227943382dd7b0b0565dc39d1 /meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src
parent31d4011207be008333c1945f18bb922b13816462 (diff)
CAN, GPIO, RNG vhost-devices for virtio-loopback [v6]quillback_16.92.0quillback/16.92.016.92.0
This patch adds key components of the viritio-loopback architecture: - kernel-module-virtio-loopback: the virtio loopback kernel driver - CAN, GPIO and RNG vhost-user devices from meta-virtualization (commit a215d8320edee0a317a6511e7e2efa5bba867486) Notes: - libgpiod, comes from meta-openembedded commit 3029554ceb0b0bb52a8d8ec3f0a75c5113662fe6 - cleaned eg-virt from unused drivers (kernel-module-virtio-video) Bug-AGL: SPEC-4834 V2 changes: - related meta-virtualization commit message added in the cover letter - updated libgpio recipe to v2.1 - SPEC reference added in cover letter v3 - add vhost-device-can preliminary version. This is placed here with the objective to share the link when proposing the new device to the rust-vmm/vhost-device community - remove cargo-update-recipe-crates includes in bb file because it is not supported by the rust mixin layer - vhost-device folder README changes v4 - fixed libgpiod required version - tested ref hw and qemu x86/64 builds - vsock, scsi and i2c rust devices removed from the build as they are not yet integrated in virtiod-loopback - cleaned-up kernel modules kernel-module-virtio-video and gstreamer1.0-plugins-bad - virtio-loopback-driver set to 2-or-later v5 - Merge with Jan-Simon version v4: - remove broken kernel-module-virtio-video - use FEATURE_PACKAGES instead of IMAGE_INSTALL:append - rename virtio-loopback-driver.bb to kernel-module-virtio-loopback_git.bb for consistency v6 - adding version in the title - removing MODULE_GIT_REPOSITORY in kernel-modules Change-Id: Id6cc58e777b9edad03b6c50d0dddaac8601edeaf Signed-off-by: Michele Paolino <m.paolino@virtualopensystems.com> Signed-off-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Diffstat (limited to 'meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src')
-rw-r--r--meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/backend.rs170
-rw-r--r--meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/can.rs264
-rw-r--r--meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/main.rs26
-rw-r--r--meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/vhu_can.rs732
4 files changed, 1192 insertions, 0 deletions
diff --git a/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/backend.rs b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/backend.rs
new file mode 100644
index 00000000..177c76cc
--- /dev/null
+++ b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/backend.rs
@@ -0,0 +1,170 @@
+// VIRTIO CAN Emulation via vhost-user
+//
+// Copyright 2023 VIRTUAL OPEN SYSTEMS SAS. All Rights Reserved.
+// Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
+//
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
+use log::{error, info, warn};
+use std::process::exit;
+use std::sync::{Arc, RwLock};
+use std::thread::{spawn, JoinHandle};
+
+use clap::Parser;
+use thiserror::Error as ThisError;
+use vhost::{vhost_user, vhost_user::Listener};
+use vhost_user_backend::VhostUserDaemon;
+use vm_memory::{GuestMemoryAtomic, GuestMemoryMmap};
+
+use crate::can::{CanController};
+use crate::vhu_can::VhostUserCanBackend;
+
+pub(crate) type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, ThisError)]
+/// Errors related to low level CAN helpers
+pub(crate) enum Error {
+ #[error("Invalid socket count: {0}")]
+ SocketCountInvalid(usize),
+ #[error("Failed to join threads")]
+ FailedJoiningThreads,
+ #[error("Could not create can controller: {0}")]
+ CouldNotCreateCanController(crate::can::Error),
+ #[error("Could not create can backend: {0}")]
+ CouldNotCreateBackend(crate::vhu_can::Error),
+ #[error("Could not create daemon: {0}")]
+ CouldNotCreateDaemon(vhost_user_backend::Error),
+}
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct CanArgs {
+ /// Location of vhost-user Unix domain socket. This is suffixed by 0,1,2..socket_count-1.
+ #[clap(short, long)]
+ socket_path: String,
+
+ /// A can device name to be used for reading (ex. vcan, can0, can1, ... etc.)
+ #[clap(short = 'i', long)]
+ can_in: String,
+
+ /// A can device name to be used for writing (ex. vcan, can0, can1, ... etc.)
+ #[clap(short = 'o', long)]
+ can_out: String,
+
+ /// Number of guests (sockets) to connect to.
+ #[clap(short = 'c', long, default_value_t = 1)]
+ socket_count: u32,
+}
+
+#[derive(PartialEq, Debug)]
+struct CanConfiguration {
+ socket_path: String,
+ socket_count: u32,
+ can_in: String,
+ can_out: String,
+}
+
+impl TryFrom<CanArgs> for CanConfiguration {
+ type Error = Error;
+
+ fn try_from(args: CanArgs) -> Result<Self> {
+
+ if args.socket_count == 0 {
+ return Err(Error::SocketCountInvalid(0));
+ }
+
+ let can_in = args.can_in.trim().to_string();
+ let can_out = args.can_out.trim().to_string();
+
+ Ok(CanConfiguration {
+ socket_path: args.socket_path,
+ socket_count: args.socket_count,
+ can_in,
+ can_out,
+ })
+ }
+}
+
+fn start_backend(args: CanArgs) -> Result<()> {
+
+ println!("start_backend function!\n");
+
+ let config = CanConfiguration::try_from(args).unwrap();
+ let mut handles = Vec::new();
+
+ for _ in 0..config.socket_count {
+ let socket = config.socket_path.to_owned();
+ let can_in = config.can_in.to_owned();
+ let can_out = config.can_out.to_owned();
+
+ let handle: JoinHandle<Result<()>> = spawn(move || loop {
+ // A separate thread is spawned for each socket and can connect to a separate guest.
+ // These are run in an infinite loop to not require the daemon to be restarted once a
+ // guest exits.
+ //
+ // There isn't much value in complicating code here to return an error from the
+ // threads, and so the code uses unwrap() instead. The panic on a thread won't cause
+ // trouble to other threads/guests or the main() function and should be safe for the
+ // daemon.
+
+ let controller =
+ CanController::new(can_in.clone(), can_out.clone()).map_err(Error::CouldNotCreateCanController)?;
+ let shared_controller_1 = Arc::new(RwLock::new(controller));
+ let shared_controller_2 = shared_controller_1.clone();
+ let vu_can_backend = Arc::new(RwLock::new(
+ VhostUserCanBackend::new(shared_controller_1).map_err(Error::CouldNotCreateBackend)?,
+ ));
+ let _read_hanlde = CanController::start_read_thread(shared_controller_2);
+
+ let mut daemon = VhostUserDaemon::new(
+ String::from("vhost-device-can-backend"),
+ vu_can_backend.clone(),
+ GuestMemoryAtomic::new(GuestMemoryMmap::new()),
+ )
+ .map_err(Error::CouldNotCreateDaemon)?;
+
+ /* Start the read thread -- need to handle it after termination */
+ let vring_workers = daemon.get_epoll_handlers();
+ vu_can_backend.read()
+ .unwrap()
+ .set_vring_worker(&vring_workers[0]);
+
+ let listener = Listener::new(socket.clone(), true).unwrap();
+ daemon.start(listener).unwrap();
+
+ match daemon.wait() {
+ Ok(()) => {
+ info!("Stopping cleanly.");
+ }
+ Err(vhost_user_backend::Error::HandleRequest(
+ vhost_user::Error::PartialMessage | vhost_user::Error::Disconnected,
+ )) => {
+ info!("vhost-user connection closed with partial message. If the VM is shutting down, this is expected behavior; otherwise, it might be a bug.");
+ }
+ Err(e) => {
+ warn!("Error running daemon: {:?}", e);
+ }
+ }
+
+ // No matter the result, we need to shut down the worker thread.
+ vu_can_backend.read().unwrap().exit_event.write(1).unwrap();
+ });
+
+ handles.push(handle);
+ }
+
+ for handle in handles {
+ handle.join().map_err(|_| Error::FailedJoiningThreads)??;
+ }
+
+ Ok(())
+}
+
+pub(crate) fn can_init() {
+ env_logger::init();
+ println!("Can_init function!");
+ if let Err(e) = start_backend(CanArgs::parse()) {
+ error!("{e}");
+ exit(1);
+ }
+}
diff --git a/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/can.rs b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/can.rs
new file mode 100644
index 00000000..228266f6
--- /dev/null
+++ b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/can.rs
@@ -0,0 +1,264 @@
+// CAN backend device
+//
+// Copyright 2023 VIRTUAL OPEN SYSTEMS SAS. All Rights Reserved.
+// Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
+//
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
+use log::{warn, error};
+use std::sync::{Arc, RwLock};
+
+use thiserror::Error as ThisError;
+use vm_memory::{ByteValued, Le16};
+
+extern crate socketcan;
+use socketcan::{
+ CanFdSocket, CanFdFrame, CanAnyFrame, EmbeddedFrame, Socket,
+ Frame, StandardId,
+};
+
+use std::thread::{JoinHandle, spawn};
+use vmm_sys_util::eventfd::{EFD_NONBLOCK, EventFd};
+
+extern crate queues;
+use queues::*;
+
+use crate::vhu_can::{VirtioCanFrame, VIRTIO_CAN_STATUS_OK};
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Copy, Clone, Debug, PartialEq, ThisError)]
+/// Errors related to low level gpio helpers
+pub(crate) enum Error {
+ //#[error("Can not enabled yet")]
+ //CanNotEnabled,
+ #[error("Can open socket operation failed")]
+ CanSocketFailed,
+ #[error("Can write socket operation failed")]
+ CanSocketWriteFailed,
+ #[error("Can read socket operation failed")]
+ CanSocketReadFailed,
+ #[error("Pop can element operation failed")]
+ CanPopFailed,
+ #[error("Creating Eventfd for CAN events failed")]
+ CanEventFdFailed,
+ #[error("CanQueueFailed")]
+ CanQueueFailed,
+}
+
+/* CAN flags to determine type of CAN Id */
+pub(crate) const VIRTIO_CAN_FLAGS_EXTENDED: u32 = 0x8000;
+pub(crate) const VIRTIO_CAN_FLAGS_FD: u32 = 0x4000;
+pub(crate) const VIRTIO_CAN_FLAGS_RTR: u32 = 0x2000;
+
+pub(crate) const VIRTIO_CAN_TX: u16 = 0x0001;
+pub(crate) const VIRTIO_CAN_RX: u16 = 0x0101;
+
+pub(crate) const CAN_EFF_FLAG: u32 = 0x80000000; /* EFF/SFF is set in the MSB */
+pub(crate) const CAN_RTR_FLAG: u32 = 0x40000000; /* remote transmission request */
+pub(crate) const CAN_ERR_FLAG: u32 = 0x20000000; /* error message frame */
+
+pub(crate) const CAN_SFF_MASK: u32 = 0x000007FF; /* standard frame format (SFF) */
+pub(crate) const CAN_EFF_MASK: u32 = 0x1FFFFFFF; /* extended frame format (EFF) */
+
+//pub(crate) const CAN_FRMF_BRS: u32 = 0x01; /* bit rate switch (2nd bitrate for data) */
+//pub(crate) const CAN_FRMF_ESI: u32 = 0x02; /* error state ind. of transmitting node */
+pub(crate) const CAN_FRMF_TYPE_FD: u32 = 0x10; /* internal bit ind. of CAN FD frame */
+pub(crate) const CAN_ERR_BUSOFF: u32 = 0x00000040; /* bus off */
+
+/// Virtio Can Configuration
+#[derive(Copy, Clone, Debug, Default, PartialEq)]
+#[repr(C)]
+pub(crate) struct VirtioCanConfig {
+ /* CAN controller status */
+ pub(crate) status: Le16,
+}
+
+// SAFETY: The layout of the structure is fixed and can be initialized by
+// reading its content from byte array.
+unsafe impl ByteValued for VirtioCanConfig {}
+
+#[derive(Debug)]
+pub(crate) struct CanController {
+ config: VirtioCanConfig,
+ pub can_in_name: String,
+ pub can_out_name: String,
+ can_out_socket: CanFdSocket,
+ pub rx_event_fd: EventFd,
+ rx_fifo: Queue<VirtioCanFrame>,
+}
+
+impl CanController {
+ // Creates a new controller corresponding to `device`.
+ pub(crate) fn new(can_in_name: String, can_out_name: String) -> Result<CanController> {
+
+ let can_in_name = can_in_name.to_owned();
+ println!("can_in_name: {:?}", can_in_name);
+
+ let can_out_name = can_out_name.to_owned();
+ println!("can_out_name: {:?}", can_out_name);
+
+ let can_out_socket = Self::open_can_sockets(can_out_name.clone());
+
+ let rx_fifo = Queue::new();
+
+ let rx_efd = EventFd::new(EFD_NONBLOCK).map_err(|_| Error::CanEventFdFailed)?;
+
+ Ok(CanController {
+ config: VirtioCanConfig {
+ status: 0x0.into(),
+ },
+ can_in_name,
+ can_out_name,
+ can_out_socket,
+ rx_event_fd: rx_efd,
+ rx_fifo
+ })
+ }
+
+ pub fn print_can_frame (canframe: VirtioCanFrame) {
+ println!("canframe.msg_type 0x{:x}", canframe.msg_type.to_native());
+ println!("canframe.can_id 0x{:x}", canframe.can_id.to_native());
+ println!("canframe.length {}", canframe.length.to_native());
+ println!("canframe.flags 0x{:x}", canframe.flags.to_native());
+ if canframe.length.to_native() == 0 {
+ println!("[]");
+ return;
+ }
+ print!("[");
+ let last_elem = canframe.length.to_native() as usize - 1;
+ for (index, sdu) in canframe.sdu.iter().enumerate() {
+ print!("0x{:x}, ", sdu);
+ if index == last_elem {
+ print!("0x{:x}", sdu);
+ break;
+ }
+ }
+ println!("]");
+ }
+
+ /* FIXME: This thread is not handle after termination */
+ pub fn start_read_thread (controller: Arc<RwLock<CanController>>) -> JoinHandle<Result<()>> {
+ spawn(move || {
+ CanController::read_can_socket(controller)
+ }
+ )
+ }
+
+ pub fn push(&mut self, rx_elem: VirtioCanFrame) -> Result<()> {
+ match self.rx_fifo.add(rx_elem) {
+ Ok(_) => Ok(()), // Successfully added, so return Ok(())
+ _ => Err(Error::CanQueueFailed), // Handle other errors
+ }
+ }
+
+ pub fn pop(&mut self) -> Result<VirtioCanFrame> {
+ match self.rx_fifo.remove() {
+ Ok(item) => Ok(item),
+ _ => Err(Error::CanPopFailed),
+ }
+ }
+
+ fn open_can_sockets (can_out_name: String) -> CanFdSocket {
+ let can_out_socket = match CanFdSocket::open(&can_out_name) {
+ Ok(socket) => socket,
+ Err(_) => {
+ warn!("Error opening CAN socket");
+ panic!("Failed to open CAN socket.");
+ //return Err(Error::CanSocketFailed);
+ }
+ };
+
+ can_out_socket
+ }
+
+ pub fn read_can_socket (controller: Arc<RwLock<CanController>>) -> Result<()> {
+ let can_in_name = &controller.read().unwrap().can_in_name.clone();
+ dbg!("Start reading from {} socket!", &can_in_name);
+ let socket = match CanFdSocket::open(&can_in_name) {
+ Ok(socket) => socket,
+ Err(_) => {
+ warn!("Error opening CAN socket");
+ return Err(Error::CanSocketFailed);
+ }
+ };
+
+ // Receive CAN messages
+ loop {
+ if let Ok(frame) = socket.read_frame() {
+
+ let mut controller = controller.write().unwrap();
+ match frame {
+ CanAnyFrame::Normal(frame) => {
+ // Regular CAN frame
+ println!("Received CAN message: {:?}", frame);
+ }
+ CanAnyFrame::Fd(frame) => {
+ // CAN FD frame
+ println!("Received CAN FD message: {:?}", frame);
+
+ let read_can_frame = VirtioCanFrame {
+ msg_type: VIRTIO_CAN_RX.into(),
+ can_id: frame.raw_id().into(),
+ length: (frame.data().len() as u16).into(),
+ reserved: 0.into(),
+ flags: frame.id_flags().bits().into(),
+ sdu: {
+ let mut sdu_data: [u8; 64] = [0; 64];
+ for i in 0..frame.data().len() {
+ sdu_data[i] = frame.data()[i];
+ }
+ sdu_data
+ },
+ };
+
+ match controller.push(read_can_frame) {
+ Ok(_) => warn!("New Can frame was received"),
+ Err(_) => {
+ warn!("Error read/push CAN frame");
+ return Err(Error::CanSocketReadFailed);
+ }
+ }
+ }
+ CanAnyFrame::Remote(frame) => {
+ // Remote CAN frame
+ println!("Received Remote CAN message: {:?}", frame);
+ }
+ CanAnyFrame::Error(frame) => {
+ // Error frame
+ println!("Received Error frame: {:?}", frame);
+ }
+ }
+
+ controller.rx_event_fd.write(1).unwrap();
+ }
+ }
+ }
+
+ pub(crate) fn config(&self) -> &VirtioCanConfig {
+ log::trace!("Get config\n");
+ &self.config
+ }
+
+ pub(crate) fn operation(&self, tx_request: VirtioCanFrame) -> Result<u8> {
+ log::trace!("Can operation\n");
+
+ // Create a CAN frame with a specific CAN-ID and the data buffer
+ let can_id = StandardId::new(tx_request.can_id.to_native().try_into().unwrap()).unwrap();
+ let data_len = tx_request.length.to_native() as usize;
+
+ let data: Vec<u8> = tx_request.sdu.iter().cloned().take(data_len).collect();
+ let frame = CanFdFrame::new(can_id, &data).unwrap();
+
+ // Send the CAN frame
+ let write_result = self.can_out_socket.write_frame(&frame);
+ match write_result {
+ Ok(_) => Ok(VIRTIO_CAN_STATUS_OK),
+ Err(_) => {
+ warn!("Error write CAN socket");
+ Err(Error::CanSocketWriteFailed)
+ }
+ }
+ }
+}
+
diff --git a/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/main.rs b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/main.rs
new file mode 100644
index 00000000..e89934ea
--- /dev/null
+++ b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/main.rs
@@ -0,0 +1,26 @@
+// VIRTIO CAN Emulation via vhost-user
+//
+// Copyright 2023 VIRTUAL OPEN SYSTEMS SAS. All Rights Reserved.
+// Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
+//
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
+#[cfg(target_env = "gnu")]
+mod backend;
+#[cfg(target_env = "gnu")]
+mod can;
+#[cfg(target_env = "gnu")]
+mod vhu_can;
+
+#[cfg(target_env = "gnu")]
+fn main() {
+ println!("Hello to main vhost-user-can");
+ backend::can_init()
+}
+
+// Rust vmm container (https://github.com/rust-vmm/rust-vmm-container) doesn't
+// have tools to do a musl build at the moment, and adding that support is
+// tricky as well to the container. Skip musl builds until the time pre-built
+// libgpiod library is available for musl.
+#[cfg(target_env = "musl")]
+fn main() {}
diff --git a/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/vhu_can.rs b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/vhu_can.rs
new file mode 100644
index 00000000..6aa12488
--- /dev/null
+++ b/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/vhu_can.rs
@@ -0,0 +1,732 @@
+// vhost device can
+//
+// Copyright 2023 VIRTUAL OPEN SYSTEMS SAS. All Rights Reserved.
+// Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
+//
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
+use log::{warn, error};
+use std::mem::size_of;
+use std::slice::from_raw_parts;
+use std::sync::{Arc, RwLock};
+use std::{
+ convert,
+ io::{self, Result as IoResult},
+};
+use std::os::fd::AsRawFd;
+use thiserror::Error as ThisError;
+use vhost::vhost_user::message::{VhostUserProtocolFeatures, VhostUserVirtioFeatures};
+use vhost_user_backend::{VhostUserBackendMut, VringRwLock, VringT};
+use virtio_bindings::bindings::virtio_config::{VIRTIO_F_NOTIFY_ON_EMPTY, VIRTIO_F_VERSION_1};
+use virtio_bindings::bindings::virtio_ring::{
+ VIRTIO_RING_F_EVENT_IDX, VIRTIO_RING_F_INDIRECT_DESC,
+};
+use virtio_queue::{DescriptorChain, QueueOwnedT};
+use vm_memory::{
+ ByteValued, Bytes, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryLoadGuard,
+ GuestMemoryMmap, Le16, Le32,
+};
+use vmm_sys_util::epoll::EventSet;
+use vmm_sys_util::eventfd::{EventFd, EFD_NONBLOCK};
+use crate::can::{
+ CanController, CAN_EFF_FLAG, CAN_RTR_FLAG, CAN_ERR_FLAG, CAN_SFF_MASK,
+ CAN_EFF_MASK, VIRTIO_CAN_FLAGS_FD, VIRTIO_CAN_FLAGS_RTR,
+ VIRTIO_CAN_FLAGS_EXTENDED, VIRTIO_CAN_TX, VIRTIO_CAN_RX,
+ CAN_FRMF_TYPE_FD, CAN_ERR_BUSOFF,
+};
+use vhost_user_backend::VringEpollHandler;
+
+/// Feature bit numbers
+pub const VIRTIO_CAN_F_CAN_CLASSIC: u16 = 0;
+pub const VIRTIO_CAN_F_CAN_FD: u16 = 1;
+//pub const VIRTIO_CAN_F_LATE_TX_ACK: u16 = 2;
+pub const VIRTIO_CAN_F_RTR_FRAMES: u16 = 3;
+
+/// Possible values of the status field
+pub const VIRTIO_CAN_STATUS_OK: u8 = 0x0;
+pub const VIRTIO_CAN_STATUS_ERR: u8 = 0x1;
+
+/// CAN Control messages
+const VIRTIO_CAN_SET_CTRL_MODE_START: u16 = 0x0201;
+const VIRTIO_CAN_SET_CTRL_MODE_STOP: u16 = 0x0202;
+
+/// Virtio configuration
+const QUEUE_SIZE: usize = 64;
+const NUM_QUEUES: usize = 3;
+
+/// Queues
+const TX_QUEUE: u16 = 0;
+const RX_QUEUE: u16 = 1;
+const CTRL_QUEUE: u16 = 2;
+const BACKEND_EFD: u16 = 4;
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Copy, Clone, Debug, PartialEq, ThisError)]
+/// Errors related to vhost-device-gpio-daemon.
+pub(crate) enum Error {
+ #[error("Failed to handle event, didn't match EPOLLIN")]
+ HandleEventNotEpollIn,
+ #[error("Failed to handle unknown event")]
+ HandleEventUnknown,
+ #[error("Received unexpected write only descriptor at index {0}")]
+ UnexpectedWriteOnlyDescriptor(usize),
+ #[error("Received unexpected readable descriptor at index {0}")]
+ UnexpectedReadableDescriptor(usize),
+ #[error("Invalid descriptor count {0}")]
+ UnexpectedDescriptorCount(usize),
+ #[error("Invalid descriptor size, expected: {0}, found: {1}")]
+ UnexpectedDescriptorSize(usize, u32),
+ #[error("Descriptor not found")]
+ DescriptorNotFound,
+ #[error("Descriptor read failed")]
+ DescriptorReadFailed,
+ #[error("Descriptor write failed")]
+ DescriptorWriteFailed,
+ #[error("Failed to send notification")]
+ NotificationFailed,
+ #[error("Failed to create new EventFd")]
+ EventFdFailed,
+ #[error("Unknown can message type: {0}")]
+ UnexpectedCanMsgType(u16),
+ #[error("RTR frames not negotiated")]
+ UnexpectedRtrFlag,
+ #[error("Can FD frames not negotiated")]
+ UnexpectedFdFlag,
+ #[error("Classic CAN frames not negotiated")]
+ UnexpectedClassicFlag,
+}
+
+impl convert::From<Error> for io::Error {
+ fn from(e: Error) -> Self {
+ io::Error::new(io::ErrorKind::Other, e)
+ }
+}
+
+/// Virtio CAN Request / Response messages
+///
+/// The response message is a stream of bytes, where first byte represents the
+/// status, and rest is message specific data.
+
+#[derive(Copy, Clone, Default)]
+#[repr(C)]
+struct VirtioCanTxResponse {
+ result: i8,
+}
+// SAFETY: The layout of the structure is fixed and can be initialized by
+// reading its content from byte array.
+unsafe impl ByteValued for VirtioCanTxResponse {}
+
+#[derive(Copy, Clone, Debug)]
+#[repr(C)]
+pub struct VirtioCanFrame {
+ pub msg_type: Le16,
+ pub length: Le16, /* 0..8 CC, 0..64 CAN­FD, 0..2048 CAN­XL, 12 bits */
+ pub reserved: Le32, /* May be needed in part for CAN XL priority */
+ pub flags: Le32,
+ pub can_id: Le32,
+ pub sdu: [u8; 64],
+}
+
+impl Default for VirtioCanFrame {
+ fn default() -> Self {
+ VirtioCanFrame {
+ msg_type: Le16::default(),
+ length: Le16::default(),
+ reserved: Le32::default(),
+ flags: Le32::default(),
+ can_id: Le32::default(),
+ sdu: [0; 64], // Initialize "asd" with default value (0 in this case)
+ }
+ }
+}
+
+// SAFETY: The layout of the structure is fixed and can be initialized by
+// reading its content from byte array.
+unsafe impl ByteValued for VirtioCanFrame {}
+
+#[derive(Copy, Clone, Default)]
+#[repr(C)]
+struct VirtioCanCtrlRequest {
+ msg_type: Le16,
+}
+// SAFETY: The layout of the structure is fixed and can be initialized by
+// reading its content from byte array.
+unsafe impl ByteValued for VirtioCanCtrlRequest {}
+
+#[derive(Copy, Clone, Default)]
+#[repr(C)]
+struct VirtioCanCtrlResponse {
+ result: i8,
+}
+// SAFETY: The layout of the structure is fixed and can be initialized by
+// reading its content from byte array.
+unsafe impl ByteValued for VirtioCanCtrlResponse {}
+
+pub(crate) struct VhostUserCanBackend {
+ controller: Arc<RwLock<CanController>>,
+ acked_features: u64,
+ event_idx: bool,
+ pub(crate) exit_event: EventFd,
+ mem: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
+}
+
+type CanDescriptorChain = DescriptorChain<GuestMemoryLoadGuard<GuestMemoryMmap<()>>>;
+
+impl VhostUserCanBackend {
+ pub(crate) fn new(controller: Arc<RwLock<CanController>>) -> Result<Self> {
+ Ok(VhostUserCanBackend {
+ controller: controller,
+ event_idx: false,
+ acked_features: 0x0,
+ exit_event: EventFd::new(EFD_NONBLOCK).map_err(|_| Error::EventFdFailed)?,
+ mem: None,
+ })
+ }
+
+ fn check_features (&self, features: u16) -> bool {
+ (self.acked_features & (1 << features)) != 0
+ }
+
+ fn process_ctrl_requests(
+ &self,
+ requests: Vec<CanDescriptorChain>,
+ vring: &VringRwLock
+ ) -> Result<bool> {
+ dbg!("process_ctrl_requests");
+
+ if requests.is_empty() {
+ return Ok(true);
+ }
+
+ for desc_chain in requests {
+ let descriptors: Vec<_> = desc_chain.clone().collect();
+
+ if descriptors.len() < 1 {
+ warn!("Error::UnexpectedDescriptorCount");
+ return Err(Error::UnexpectedDescriptorCount(descriptors.len()));
+ }
+
+ println!("descriptors.len(): {:?}", descriptors.len());
+
+ let desc_request = descriptors[0];
+ if desc_request.is_write_only() {
+ warn!("Error::UnexpectedWriteOnlyDescriptor");
+ return Err(Error::UnexpectedWriteOnlyDescriptor(0));
+ }
+
+ if desc_request.len() as usize != size_of::<VirtioCanCtrlRequest>() {
+ println!("UnexpectedDescriptorSize, len = {:?}", desc_request.len());
+ return Err(Error::UnexpectedDescriptorSize(
+ size_of::<VirtioCanCtrlRequest>(),
+ desc_request.len(),
+ ));
+ }
+
+ let request = desc_chain
+ .memory()
+ .read_obj::<VirtioCanCtrlRequest>(desc_request.addr())
+ .map_err(|_| Error::DescriptorReadFailed)?;
+
+
+ match request.msg_type.into() {
+ VIRTIO_CAN_SET_CTRL_MODE_START => {
+ println!("VIRTIO_CAN_SET_CTRL_MODE_START");
+ //vcan->busoff = false;
+ Ok(())
+ }
+ VIRTIO_CAN_SET_CTRL_MODE_STOP => {
+ println!("VIRTIO_CAN_SET_CTRL_MODE_STOP");
+ //vcan->busoff = false;
+ Ok(())
+ }
+ _ => {
+ println!("Ctrl queue: msg type 0x{:?} unknown", request.msg_type);
+ return Err(Error::HandleEventUnknown.into())
+ },
+ }?;
+
+ let desc_response = descriptors[1];
+ if !desc_response.is_write_only() {
+ println!("This is not wirtable");
+ return Err(Error::UnexpectedReadableDescriptor(1));
+ }
+
+ let response = VIRTIO_CAN_STATUS_OK;
+
+ desc_chain
+ .memory()
+ .write_slice(response.as_slice(), desc_response.addr())
+ .map_err(|_| Error::DescriptorWriteFailed)?;
+
+ if vring.add_used(desc_chain.head_index(), desc_response.len()).is_err() {
+ println!("Couldn't return used descriptors to the ring");
+ warn!("Couldn't return used descriptors to the ring");
+ }
+ }
+
+ Ok(true)
+ }
+
+ fn process_tx_requests(
+ &self,
+ requests: Vec<CanDescriptorChain>,
+ vring: &VringRwLock
+ ) -> Result<bool> {
+ dbg!("process_tx_requests");
+
+ if requests.is_empty() {
+ return Ok(true);
+ }
+
+ println!("requests.len: {:?}", requests.len());
+ for desc_chain in requests {
+ let descriptors: Vec<_> = desc_chain.clone().collect();
+
+ if descriptors.len() != 2 {
+ println!("Error::UnexpectedDescriptorCount");
+ return Err(Error::UnexpectedDescriptorCount(descriptors.len()));
+ }
+
+ let desc_request = descriptors[0];
+ if desc_request.is_write_only() {
+ println!("Error::UnexpectedReadOnlyDescriptor");
+ return Err(Error::UnexpectedWriteOnlyDescriptor(0));
+ }
+
+ if desc_request.len() as usize != size_of::<VirtioCanFrame>() {
+ println!("Tx UnexpectedDescriptorSize, len = {:?}", desc_request.len());
+ //return Err(Error::UnexpectedDescriptorSize(
+ // size_of::<VirtioCanFrame>(),
+ // desc_request.len(),
+ //));
+ }
+
+ let request = desc_chain
+ .memory()
+ .read_obj::<VirtioCanFrame>(desc_request.addr())
+ .map_err(|_| Error::DescriptorReadFailed)?;
+
+ CanController::print_can_frame(request);
+
+ let msg_type = request.msg_type.to_native();
+ let mut can_id = request.can_id.to_native();
+ let mut flags = request.flags.to_native();
+ let mut length = request.length.to_native();
+
+ if msg_type != VIRTIO_CAN_TX {
+ warn!("TX: Message type 0x{:x} unknown\n", msg_type);
+ return Err(Error::UnexpectedCanMsgType(msg_type));
+ }
+
+ if (flags & VIRTIO_CAN_FLAGS_FD) != 0 {
+ if length > 64 {
+ println!("Cut sdu_len from {:?} to 64\n", request.length);
+ length = 64;
+ }
+ } else {
+ if length > 8 {
+ println!("Cut sdu_len from {:?} to 8\n", request.length);
+ length = 8;
+ }
+ }
+
+ /*
+ * Copy Virtio frame structure to qemu frame structure and
+ * check while doing this whether the frame type was negotiated
+ */
+ if (flags & VIRTIO_CAN_FLAGS_EXTENDED) != 0 {
+ flags &= CAN_EFF_MASK;
+ flags |= CAN_EFF_FLAG;
+ } else {
+ flags &= CAN_SFF_MASK;
+ }
+
+ if (flags & VIRTIO_CAN_FLAGS_RTR) != 0 {
+ if !self.check_features(VIRTIO_CAN_F_CAN_CLASSIC) ||
+ !self.check_features(VIRTIO_CAN_F_RTR_FRAMES) {
+ warn!("TX: RTR frames not negotiated");
+ return Err(Error::UnexpectedRtrFlag);
+ }
+ can_id |= flags | CAN_RTR_FLAG;
+ }
+
+ if (flags & VIRTIO_CAN_FLAGS_FD) != 0 {
+ if !self.check_features(VIRTIO_CAN_F_CAN_FD) {
+ warn!("TX: FD frames not negotiated\n");
+ return Err(Error::UnexpectedFdFlag);
+ }
+ flags |= CAN_FRMF_TYPE_FD;
+ } else {
+ if !self.check_features(VIRTIO_CAN_F_CAN_CLASSIC) {
+ warn!("TX: Classic frames not negotiated\n");
+ return Err(Error::UnexpectedClassicFlag);
+ }
+ flags = 0;
+ }
+
+ let mut corrected_request = VirtioCanFrame::default();
+ corrected_request.msg_type = msg_type.into();
+ corrected_request.can_id = can_id.into();
+ corrected_request.flags = flags.into();
+ corrected_request.length = length.into();
+ corrected_request.sdu.copy_from_slice(&request.sdu[0..64]);
+
+ let desc_response = descriptors[1];
+ if !desc_response.is_write_only() {
+ println!("Error::UnexpectedWriteOnlyDescriptor");
+ return Err(Error::UnexpectedReadableDescriptor(1));
+ }
+
+ let response = match self.controller.write().unwrap().operation(corrected_request) {
+ Ok(result) => {
+ result
+ }
+ Err(_) => {
+ warn!("We got an error from controller send func");
+ VIRTIO_CAN_STATUS_ERR
+ }
+ };
+
+ desc_chain
+ .memory()
+ .write_slice(response.as_slice(), desc_response.addr())
+ .map_err(|_| Error::DescriptorWriteFailed)?;
+
+ if vring.add_used(desc_chain.head_index(), desc_response.len()).is_err() {
+ println!("Couldn't return used descriptors to the ring");
+ warn!("Couldn't return used descriptors to the ring");
+ }
+ }
+
+ Ok(true)
+ }
+
+ fn process_rx_requests(
+ &mut self,
+ requests: Vec<CanDescriptorChain>,
+ vring: &VringRwLock
+ ) -> Result<bool> {
+ dbg!("process_rx_requests");
+
+ if requests.is_empty() {
+ return Ok(true);
+ }
+
+ let desc_chain = &requests[0];
+ let descriptors: Vec<_> = desc_chain.clone().collect();
+
+ if descriptors.len() != 1 {
+ println!("Error::UnexpectedDescriptorCount");
+ return Err(Error::UnexpectedDescriptorCount(descriptors.len()));
+ }
+
+ let desc_response = descriptors[0];
+ if !desc_response.is_write_only() {
+ return Err(Error::UnexpectedReadableDescriptor(1));
+ }
+
+ let mut response = match self.controller.write().unwrap().pop() {
+ Ok(item) => item,
+ Err(_) => return Err(Error::HandleEventUnknown),
+ };
+
+ CanController::print_can_frame(response);
+
+ if (response.can_id.to_native() & CAN_ERR_FLAG) != 0 {
+ if (response.can_id.to_native() & CAN_ERR_BUSOFF) != 0 {
+ warn!("Got BusOff error frame, device does a local bus off\n");
+ //vcan->busoff = true;
+ } else {
+ println!("Dropping error frame 0x{:x}\n", response.can_id.to_native());
+ }
+ return Ok(true);
+ }
+
+ let mut can_rx = VirtioCanFrame::default();
+ can_rx.msg_type = VIRTIO_CAN_RX.into();
+ can_rx.can_id = response.can_id;
+ can_rx.length = response.length;
+ can_rx.flags = (can_rx.flags.to_native() | VIRTIO_CAN_FLAGS_FD).into();
+
+ if (response.flags.to_native() & CAN_FRMF_TYPE_FD) != 0 {
+ if !self.check_features(VIRTIO_CAN_F_CAN_FD) {
+ warn!("Drop non-supported CAN FD frame");
+ return Err(Error::UnexpectedFdFlag);
+ }
+ } else {
+ if !self.check_features(VIRTIO_CAN_F_CAN_CLASSIC) {
+ warn!("Drop non-supported CAN classic frame");
+ return Err(Error::UnexpectedClassicFlag);
+ }
+ }
+ if (response.can_id.to_native() & CAN_RTR_FLAG) != 0 &&
+ !self.check_features(VIRTIO_CAN_F_RTR_FRAMES) {
+ warn!("Drop non-supported RTR frame");
+ return Err(Error::UnexpectedRtrFlag);
+ }
+
+ if (response.can_id.to_native() & CAN_EFF_FLAG) != 0 {
+ can_rx.flags = VIRTIO_CAN_FLAGS_EXTENDED.into();
+ can_rx.can_id = (response.can_id.to_native() & CAN_EFF_MASK).into();
+ } else {
+ can_rx.can_id = (response.can_id.to_native() & CAN_SFF_MASK).into();
+ }
+ if (response.can_id.to_native() & CAN_RTR_FLAG) != 0 {
+ can_rx.flags = (can_rx.flags.to_native() & VIRTIO_CAN_FLAGS_RTR).into();
+ }
+
+ // HACK AHEAD: Vcan can not be comfigured as CANFD interface, but possible
+ // to configure its MTU to 64 bytes. So if a messages bigger than 8 bytes
+ // is being received we consider it as CANFD message.
+ let can_in_name = self.controller.read().unwrap().can_in_name.clone();
+ if self.check_features(VIRTIO_CAN_F_CAN_FD) &&
+ response.length.to_native() > 8 && can_in_name == "vcan0" {
+ response.flags = (response.flags.to_native() | CAN_FRMF_TYPE_FD).into();
+ warn!("\n\n\nCANFD VCAN0\n\n");
+ }
+
+ if (response.flags.to_native() & CAN_FRMF_TYPE_FD) != 0 {
+ can_rx.flags = (can_rx.flags.to_native() | VIRTIO_CAN_FLAGS_FD).into();
+ if response.length.to_native() > 64 {
+ warn!("%s(): Cut length from {} to 64\n", response.length.to_native());
+ can_rx.length = 64.into();
+ }
+ } else {
+ if response.length.to_native() > 8 {
+ warn!("%s(): Cut length from {} to 8\n", response.length.to_native());
+ can_rx.length = 8.into();
+ }
+ }
+
+ can_rx.sdu.copy_from_slice(&response.sdu[0..64]);
+ CanController::print_can_frame(can_rx);
+
+ desc_chain
+ .memory()
+ .write_slice(can_rx.as_slice(), desc_response.addr())
+ .map_err(|_| Error::DescriptorWriteFailed)?;
+
+ if vring.add_used(desc_chain.head_index(), desc_response.len()).is_err() {
+ warn!("Couldn't return used descriptors to the ring");
+ }
+
+ Ok(true)
+ }
+
+ /// Process the messages in the vring and dispatch replies
+ fn process_ctrl_queue(&mut self, vring: &VringRwLock) -> Result<()> {
+ dbg!("process_ctrl_queue");
+ let requests: Vec<_> = vring
+ .get_mut()
+ .get_queue_mut()
+ .iter(self.mem.as_ref().unwrap().memory())
+ .map_err(|_| Error::DescriptorNotFound)?
+ .collect();
+
+ if self.process_ctrl_requests(requests, vring)? {
+ // Send notification once all the requests are processed
+ vring
+ .signal_used_queue()
+ .map_err(|_| Error::NotificationFailed)?;
+ }
+ Ok(())
+ }
+
+ /// Process the messages in the vring and dispatch replies
+ fn process_tx_queue(&self, vring: &VringRwLock) -> Result<()> {
+ dbg!("process_tx_queue");
+ let requests: Vec<_> = vring
+ .get_mut()
+ .get_queue_mut()
+ .iter(self.mem.as_ref().unwrap().memory())
+ .map_err(|_| Error::DescriptorNotFound)?
+ .collect();
+
+ if self.process_tx_requests(requests, vring)? {
+ // Send notification once all the requests are processed
+ vring
+ .signal_used_queue()
+ .map_err(|_| {
+ println!("signal_used_queue error");
+ Error::NotificationFailed
+ })?;
+ }
+
+ Ok(())
+ }
+
+ /// Process the messages in the vring and dispatch replies
+ fn process_rx_queue(&mut self, vring: &VringRwLock) -> Result<()> {
+ dbg!("process_rx_queue");
+ let requests: Vec<_> = vring
+ .get_mut()
+ .get_queue_mut()
+ .iter(self.mem.as_ref().unwrap().memory())
+ .map_err(|_| Error::DescriptorNotFound)?
+ .collect();
+
+ if self.process_rx_requests(requests, vring)? {
+ // Send notification once all the requests are processed
+ vring
+ .signal_used_queue()
+ .map_err(|_| {
+ println!("NotificationFailed");
+ Error::NotificationFailed
+ })?;
+ }
+ Ok(())
+ }
+
+ fn process_rx_queue_dump(&mut self, _vring: &VringRwLock) -> Result<()> {
+ dbg!("Do nothing, if you reach that point!");
+ Ok(())
+ }
+
+ /// Set self's VringWorker.
+ pub(crate) fn set_vring_worker(
+ &self,
+ vring_worker: &Arc<VringEpollHandler<Arc<RwLock<VhostUserCanBackend>>, VringRwLock, ()>>,
+ ) {
+ let rx_event_fd = self.controller.read().unwrap().rx_event_fd.as_raw_fd();
+ vring_worker
+ .register_listener(
+ rx_event_fd,
+ EventSet::IN,
+ //u64::from(BACKEND_EFD))
+ 4u64 as u64)
+ .unwrap();
+ }
+}
+
+/// VhostUserBackendMut trait methods
+impl VhostUserBackendMut<VringRwLock, ()>
+ for VhostUserCanBackend
+{
+ fn num_queues(&self) -> usize {
+ println!("num_queues: {:?}", NUM_QUEUES);
+ NUM_QUEUES
+ }
+
+ fn max_queue_size(&self) -> usize {
+ println!("max_queue_size: {:?}", QUEUE_SIZE);
+ QUEUE_SIZE
+ }
+
+ fn features(&self) -> u64 {
+ // this matches the current libvhost defaults except VHOST_F_LOG_ALL
+ let features = 1 << VIRTIO_F_VERSION_1
+ | 1 << VIRTIO_F_NOTIFY_ON_EMPTY
+ | 1 << VIRTIO_RING_F_EVENT_IDX
+ | 1 << VIRTIO_CAN_F_CAN_CLASSIC
+ | 1 << VIRTIO_CAN_F_CAN_FD
+ | 1 << VIRTIO_RING_F_INDIRECT_DESC
+ | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
+
+ println!("vhu_can->features: {:x}", features);
+ features
+ }
+
+ fn acked_features(&mut self, _features: u64) {
+ println!("\nacked_features: 0x{:x}\n", _features);
+ self.acked_features = _features;
+ }
+
+ fn protocol_features(&self) -> VhostUserProtocolFeatures {
+ let protocol_features = VhostUserProtocolFeatures::MQ
+ | VhostUserProtocolFeatures::CONFIG
+ | VhostUserProtocolFeatures::REPLY_ACK;
+ //| VhostUserProtocolFeatures::STATUS
+
+ println!("protocol_features: {:x}", protocol_features);
+ protocol_features
+ }
+
+ fn get_config(&self, offset: u32, size: u32) -> Vec<u8> {
+ // SAFETY: The layout of the structure is fixed and can be initialized by
+ // reading its content from byte array.
+ dbg!("vhu_can->get_config");
+ unsafe {
+ from_raw_parts(
+ self.controller.write().unwrap()
+ .config()
+ .as_slice()
+ .as_ptr()
+ .offset(offset as isize) as *const _ as *const _,
+ size as usize,
+ )
+ .to_vec()
+ }
+ }
+
+ fn set_event_idx(&mut self, enabled: bool) {
+ dbg!(self.event_idx = enabled);
+ }
+
+ fn update_memory(&mut self, mem: GuestMemoryAtomic<GuestMemoryMmap>) -> IoResult<()> {
+ dbg!("update_memory\n");
+ self.mem = Some(mem);
+ Ok(())
+ }
+
+ fn handle_event(
+ &mut self,
+ device_event: u16,
+ evset: EventSet,
+ vrings: &[VringRwLock],
+ _thread_id: usize,
+ ) -> IoResult<bool> {
+ dbg!("\nhandle_event:");
+
+ if evset != EventSet::IN {
+ return Err(Error::HandleEventNotEpollIn.into());
+ }
+ if device_event == RX_QUEUE {
+ println!("RX_QUEUE\n");
+ return Ok(false);
+ };
+ let vring = if device_event != BACKEND_EFD {
+ &vrings[device_event as usize]
+ } else {
+ println!("BACKEND_EFD\n");
+ let _ = self.controller.write().unwrap().rx_event_fd.read();
+ &vrings[RX_QUEUE as usize]
+ };
+ if self.event_idx {
+ // vm-virtio's Queue implementation only checks avail_index
+ // once, so to properly support EVENT_IDX we need to keep
+ // calling process_request_queue() until it stops finding
+ // new requests on the queue.
+ loop {
+ vring.disable_notification().unwrap();
+ //match queue_idx {
+ match device_event {
+ CTRL_QUEUE => self.process_ctrl_queue(vring),
+ TX_QUEUE => self.process_tx_queue(vring),
+ RX_QUEUE => self.process_rx_queue_dump(vring),
+ BACKEND_EFD => self.process_rx_queue(vring),
+ _ => Err(Error::HandleEventUnknown.into()),
+ }?;
+ if !vring.enable_notification().unwrap() {
+ break;
+ }
+ }
+ } else {
+ // Without EVENT_IDX, a single call is enough.
+ match device_event {
+ CTRL_QUEUE => self.process_ctrl_queue(vring),
+ TX_QUEUE => self.process_tx_queue(vring),
+ RX_QUEUE => self.process_rx_queue_dump(vring),
+ BACKEND_EFD => self.process_rx_queue(vring),
+ _ => Err(Error::HandleEventUnknown.into()),
+ }?;
+ }
+ Ok(false)
+ }
+
+ fn exit_event(&self, _thread_index: usize) -> Option<EventFd> {
+ dbg!("exit_event\n");
+ self.exit_event.try_clone().ok()
+ }
+}
+