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vhost_user_net: Port to new exit event strategy

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Implement the exit_event() method on the VhostUserBackend trait. It is
necessary to specify a custom exit event id in this case as the loop is
also used for handling activity on the tap file descriptors.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-02-11 11:27:03 +00:00 committed by Sebastien Boeuf
parent c33c38bd96
commit 700df9eb16
1 changed files with 8 additions and 23 deletions
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31
vhost_user_net/src/lib.rs
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@ -249,13 +249,6 @@ impl VhostUserNetBackend {
pub fn set_vring_worker(&mut self, vring_worker: Option<Arc<VringWorker>>) {
self.vring_worker = vring_worker;
}
pub fn get_kill_event(&self) -> (u16, EventFd) {
(
(self.num_queues + (self.num_queues / 2)) as u16,
self.kill_evt.try_clone().unwrap(),
)
}
}
impl VhostUserBackend for VhostUserNetBackend {
@ -299,7 +292,6 @@ impl VhostUserBackend for VhostUserNetBackend {
let tap_start_index = self.num_queues as u16;
let tap_end_index = (self.num_queues + self.num_queues / 2 - 1) as u16;
let kill_index = tap_end_index + 1;
match device_event {
x if ((x < self.num_queues as u16) && (x % 2 == 0)) => {
@ -339,15 +331,17 @@ impl VhostUserBackend for VhostUserNetBackend {
self.process_rx(&mut vring, index)?;
}
}
x if x == kill_index => {
self.kill_evt.read().unwrap();
return Ok(true);
}
_ => return Err(Error::HandleEventUnknownEvent.into()),
}
Ok(false)
}
fn exit_event(&self) -> Option<(EventFd, Option<u16>)> {
let tap_end_index = (self.num_queues + self.num_queues / 2 - 1) as u16;
let kill_index = tap_end_index + 1;
Some((self.kill_evt.try_clone().unwrap(), Some(kill_index)))
}
}
pub struct VhostUserNetBackendConfig<'a> {
@ -439,18 +433,8 @@ pub fn start_net_backend(backend_command: &str) {
)
.unwrap();
let (kill_index, kill_evt_fd) = net_backend.read().unwrap().get_kill_event();
let vring_worker = net_daemon.get_vring_worker();
if let Err(e) = vring_worker.register_listener(
kill_evt_fd.as_raw_fd(),
epoll::Events::EPOLLIN,
u64::from(kill_index),
) {
println!("failed to register listener for kill event: {:?}", e);
process::exit(1);
}
net_backend
.write()
.unwrap()
@ -468,7 +452,8 @@ pub fn start_net_backend(backend_command: &str) {
error!("Error from the main thread: {:?}", e);
}
if let Err(e) = kill_evt_fd.write(1) {
let kill_evt = &net_backend.write().unwrap().kill_evt;
if let Err(e) = kill_evt.write(1) {
error!("Error shutting down worker thread: {:?}", e)
}
}