Struct SmoltcpBackend 

pub struct SmoltcpBackend { /* private fields */ }

Network backend that bridges libkrun’s NetWorker to smoltcp via lock-free queues.

• TX path (write_frame): strips the virtio-net header, pushes the ethernet frame to tx_ring, wakes the smoltcp poll thread.
• RX path (read_frame): pops a frame from rx_ring, prepends a zeroed virtio-net header for the guest.
• Wake fd (raw_socket_fd): returns rx_wake’s read end so the NetWorker’s epoll can detect new frames.

Implementations

impl SmoltcpBackend

pub fn new(shared: Arc<SharedState>) -> Self

Create a new backend connected to the given shared state.

Trait Implementations

impl NetBackend for SmoltcpBackend

fn write_frame( &mut self, hdr_len: usize, buf: &mut [u8], ) -> Result<(), WriteError>

Guest is sending a frame. Strip the virtio-net header and enqueue the raw ethernet frame for smoltcp.

fn read_frame(&mut self, buf: &mut [u8]) -> Result<usize, ReadError>

Deliver a frame from smoltcp to the guest. Prepends a zeroed virtio-net header.

fn has_unfinished_write(&self) -> bool

No partial writes — queue push is atomic.

fn try_finish_write( &mut self, _hdr_len: usize, _buf: &[u8], ) -> Result<(), WriteError>

No partial writes — nothing to finish.

fn raw_socket_fd(&self) -> RawFd

File descriptor for NetWorker’s epoll. Becomes readable when rx_ring has frames for the guest (i.e. when smoltcp’s SmoltcpDevice::transmit() pushes a frame and wakes rx_wake).