--- /dev/null
+// 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()
+ }
+}
+
Code Review / AGL / meta-agl-devel.git / blobdiff