Struct devices::usb::backend::fido_backend::transfer::FidoTransfer

pub struct FidoTransfer {
    pub buffer: TransferBuffer,
    status: TransferStatus,
    pub actual_length: usize,
    pub endpoint: u8,
    submission_time: Instant,
    pub callback: Option<Box<dyn Fn(FidoTransfer) + Send + Sync>>,
}

Implementation of a generic USB transfer for the FIDO backend. It implements common USB transfer functionality since it cannot rely on the transfer structures provided by the usb_utils crate as the FIDO backend does not use usbdevfs to communicate with the host.

Fields

buffer: TransferBuffer

TransferBuffer structure with either a request or response data from the guest/host.

status: TransferStatus

Status of the transfer, used by the xhci layer for a successful completion.

actual_length: usize

Actual length of the transfer, as per USB specs.

endpoint: u8

USB endpoint associated with this transfer.

submission_time: Instant

Timestamp of the transfer submission time.

callback: Option<Box<dyn Fn(FidoTransfer) + Send + Sync>>

Callback to be executed once the transfer has completed, to signal the xhci layer.

Implementations

impl FidoTransfer

pub fn new(endpoint: u8, buffer: TransferBuffer) -> FidoTransfer

pub fn signal_device_lost(&mut self)

Called when the device is lost and we need to signal to the xhci layer that the transfer cannot continue and the device should be detached.

pub fn timeout_expired(&self) -> bool

Checks if the current transfer should time out or not

pub fn complete_transfer(self)

Finalizes the transfer by setting the right status and then calling the callback to signal the xhci layer.

Trait Implementations

impl BackendTransfer for FidoTransfer

fn status(&self) -> TransferStatus

Returns the status of the transfer in a TransferStatus enum

fn actual_length(&self) -> usize

Returns the actual amount of data transferred, which may be less than the original length.

fn buffer(&self) -> &TransferBuffer

Returns a reference to the TransferBuffer object.

fn set_callback<C: 'static + Fn(BackendTransferType) + Send + Sync>( &mut self, cb: C, )

Sets an optional callback on the transfer to be called when the transfer completes.