Update vhost-device-can and align it with rust-vmm implementation

[v2]:
Remove recipe for socketcan-rs lib. Update vhost-device-can recipe
to clone and be built with a selected version of socketcan-rs.

[v1]:
Update vhost-device-can device and align it with the
vhost-device upstream implementation (commit: 42fa1204ec)
- https://github.com/rust-vmm/vhost-device/tree/main/staging/vhost-device-can

Bug-AGL: SPEC-4966
Change-Id: I9b7f5cb5d84c77198bc0c8b8cebc256fb5df6926
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>

1 files changed, 0 insertions, 732 deletions

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
deleted file mode 100644
index 6aa12488..00000000
--- a/meta-egvirt/recipes-extended/vhost-device-can/vhost-device-can-0.1.0/src/vhu_can.rs
+++ /dev/null
@@ -1,732 +0,0 @@
-// 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()
-    }
-}
-