usbvfiod 0.1.0

A vfio-user server for USB pass-through.
Documentation 
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//! Represents a USB control request.

/// Represents a USB control request.
///
/// For documentation of the fields other than `address`, see Section "9.3 USB
/// Device Requests" in the USB 2.0 specification.
///
/// A request without data is packaged in two TRBs (a Setup Stage and a
/// Status Stage). `data` should then be `None`.
///
/// A request with data is packaged in three TRBs (a Setup Stage, a Data
/// Stage and a Status Stage). `data` should then contain the pointer
/// from the Data Stage).
///
#[derive(Debug, PartialEq, Eq, Clone, Default)]
pub struct UsbRequest {
    /// The guest address of the Status Stage of this request.
    pub address: u64,
    pub request_type: u8,
    pub request: u8,
    pub value: u16,
    pub index: u16,
    pub length: u16,
    pub data_pointer: Option<u64>,
    pub data: Option<Vec<u8>>,
}

impl UsbRequest {
    // so that the control endpoint handler can make a copy
    // (to store the request between submit_trb and next_complete)
    pub const fn clone_without_data(&self) -> Self {
        Self {
            address: self.address,
            request_type: self.request_type,
            request: self.request,
            value: self.value,
            index: self.index,
            length: self.length,
            data_pointer: self.data_pointer,
            data: None,
        }
    }
}