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vm-virtio: Modify VirtioInterrupt callback into a trait

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Callbacks are not the most Rust idiomatic way of programming. The right
way is to use a Trait to provide multiple implementation of the same
interface.

Additionally, a Trait will allow for multiple functions to be defined
while using callbacks means that a new callback must be introduced for
each new function we want to add.

For these two reasons, the current commit modifies the existing
VirtioInterrupt callback into a Trait of the same name.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-01-13 18:52:19 +01:00
committed by Samuel Ortiz
parent ef7d889a79
commit c396baca46
18 changed files with 221 additions and 223 deletions
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18
vm-virtio/src/net.rs
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@@ -48,7 +48,7 @@ struct NetEpollHandler {
tap: Tap,
rx: RxVirtio,
tx: TxVirtio,
interrupt_cb: Arc<VirtioInterrupt>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
kill_evt: EventFd,
pause_evt: EventFd,
epoll_fd: RawFd,
@@ -57,10 +57,12 @@ struct NetEpollHandler {
impl NetEpollHandler {
fn signal_used_queue(&self, queue: &Queue) -> result::Result<(), DeviceError> {
(self.interrupt_cb)(&VirtioInterruptType::Queue, Some(queue)).map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
self.interrupt_cb
.trigger(&VirtioInterruptType::Queue, Some(queue))
.map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
}
// Copies a single frame from `self.rx.frame_buf` into the guest. Returns true
@@ -299,7 +301,7 @@ pub struct Net {
// or nothing, if no such address if provided.
config_space: Vec<u8>,
queue_evts: Option<Vec<EventFd>>,
interrupt_cb: Option<Arc<VirtioInterrupt>>,
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
epoll_thread: Option<Vec<thread::JoinHandle<result::Result<(), DeviceError>>>>,
ctrl_queue_epoll_thread: Option<thread::JoinHandle<result::Result<(), DeviceError>>>,
paused: Arc<AtomicBool>,
@@ -449,7 +451,7 @@ impl VirtioDevice for Net {
fn activate(
&mut self,
mem: Arc<ArcSwap<GuestMemoryMmap>>,
interrupt_cb: Arc<VirtioInterrupt>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
mut queues: Vec<Queue>,
mut queue_evts: Vec<EventFd>,
) -> ActivateResult {
@@ -562,7 +564,7 @@ impl VirtioDevice for Net {
Err(ActivateError::BadActivate)
}
fn reset(&mut self) -> Option<(Arc<VirtioInterrupt>, Vec<EventFd>)> {
fn reset(&mut self) -> Option<(Arc<dyn VirtioInterrupt>, Vec<EventFd>)> {
// We first must resume the virtio thread if it was paused.
if self.pause_evt.take().is_some() {
self.resume().ok()?;