Struct virtio_driver::Le16

pub struct Le16(_);

An integer type of with an explicit endianness.

See module level documentation for examples.

Implementations

impl Le16

pub fn to_native(self) -> u16

Converts self to the native endianness.

Examples found in repository

src/virtqueue.rs (line 347)

    pub fn add_request<F>(&mut self, prepare: F) -> Result<u16, Error>
    where
        F: FnOnce(&mut R, &mut dyn FnMut(iovec, bool) -> Result<(), Error>) -> Result<(), Error>,
    {
        let first_idx = match self.first_free_desc {
            NO_FREE_DESC => {
                return Err(Error::new(ErrorKind::Other, "Not enough free descriptors"));
            }
            idx => idx,
        };

        let req_ptr = unsafe { &mut *self.req.offset(first_idx as isize) };
        let mut last_idx: Option<u16> = None;

        let res = prepare(req_ptr, &mut |iovec: iovec, from_dev: bool| {
            // Set NEXT for all descriptors, it is unset again below for the last one
            let mut flags = VirtqueueDescriptorFlags::NEXT;
            if from_dev {
                flags.insert(VirtqueueDescriptorFlags::WRITE);
            }
            last_idx = Some(self.add_desc(iovec, flags)?);
            Ok(())
        });

        if let Err(e) = res {
            self.first_free_desc = first_idx;
            return Err(e);
        }

        let mut last_flags = self.desc[last_idx.unwrap() as usize].flags.to_native();
        last_flags &= !VirtqueueDescriptorFlags::NEXT.bits();
        self.desc[last_idx.unwrap() as usize].flags = last_flags.into();

        self.add_avail(&[first_idx]);
        Ok(first_idx)
    }

    fn free_desc(&mut self, first_idx: u16) {
        let mut idx = first_idx as usize;
        while self.desc[idx].flags.to_native() & VirtqueueDescriptorFlags::NEXT.bits() != 0 {
            idx = self.desc[idx].next.to_native().into();
        }

        self.desc[idx].next = self.first_free_desc.into();
        self.first_free_desc = first_idx;
    }

Trait Implementations

impl ByteValued for Le16

fn from_slice(data: &[u8]) -> Option<&Self>

Converts a slice of raw data into a reference of Self.

fn from_mut_slice(data: &mut [u8]) -> Option<&mut Self>

Converts a mutable slice of raw data into a mutable reference of Self.

fn from_reader<R: Read>(read: R) -> Result<Self>

Creates an instance of Self by copying raw data from an io::Read stream.

fn as_slice(&self) -> &[u8]

Converts a reference to self into a slice of bytes.

fn as_mut_slice(&mut self) -> &mut [u8]

Converts a mutable reference to self into a mutable slice of bytes.

impl Clone for Le16

fn clone(&self) -> Le16

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Le16

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Le16

fn default() -> Le16

Returns the “default value” for a type.

impl From<Le16> for u16

fn from(v: Le16) -> u16

Converts to this type from the input type.

impl From<u16> for Le16

fn from(v: u16) -> Le16

Converts to this type from the input type.

impl PartialEq<Le16> for Le16

fn eq(&self, other: &Le16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<Le16> for u16

fn eq(&self, other: &Le16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq<u16> for Le16

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Le16

impl Eq for Le16

impl StructuralEq for Le16

impl StructuralPartialEq for Le16