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vhost_user_backend: Pass a backend that can be modified

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This patch modifies the library so that a consumer can update the
backend after it's been passed to the daemon.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2019-09-23 12:54:24 -07:00
parent f14ab872ec
commit 347611b0c7
1 changed files with 6 additions and 7 deletions
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13
vhost_user_backend/src/lib.rs
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@ -115,7 +115,7 @@ impl<S: VhostUserBackend> VhostUserDaemon<S> {
/// listening onto registered event. Those events can be vring events or
/// custom events from the backend, but they get to be registered later
/// during the sequence.
pub fn new(name: String, sock_path: String, backend: S) -> Result<Self> {
pub fn new(name: String, sock_path: String, backend: Arc<RwLock<S>>) -> Result<Self> {
let handler = Arc::new(Mutex::new(
VhostUserHandler::new(backend).map_err(Error::NewVhostUserHandler)?,
));
@ -497,17 +497,16 @@ struct VhostUserHandler<S: VhostUserBackend> {
}
impl<S: VhostUserBackend> VhostUserHandler<S> {
fn new(backend: S) -> VhostUserHandlerResult<Self> {
let num_queues = backend.num_queues();
let max_queue_size = backend.max_queue_size();
fn new(backend: Arc<RwLock<S>>) -> VhostUserHandlerResult<Self> {
let num_queues = backend.read().unwrap().num_queues();
let max_queue_size = backend.read().unwrap().max_queue_size();
let arc_backend = Arc::new(RwLock::new(backend));
let vrings = vec![Arc::new(RwLock::new(Vring::new(max_queue_size as u16))); num_queues];
// Create the epoll file descriptor
let epoll_fd = epoll::create(true).map_err(VhostUserHandlerError::EpollCreateFd)?;
let vring_handler = Arc::new(RwLock::new(VringEpollHandler {
backend: arc_backend.clone(),
backend: backend.clone(),
vrings: vrings.clone(),
mem: None,
epoll_fd,
@ -522,7 +521,7 @@ impl<S: VhostUserBackend> VhostUserHandler<S> {
.map_err(VhostUserHandlerError::SpawnVringWorker)?;
Ok(VhostUserHandler {
backend: arc_backend,
backend,
vring_handler,
owned: false,
features_acked: false,