Struct VirtqMsgHeader 

#[repr(C)]
pub struct VirtqMsgHeader {
    pub kind: u8,
    pub flags: u8,
    pub req_id: u16,
    pub payload_len: u32,
}

Wire header for all virtqueue messages

Fields

kind: u8

Discriminates the message type.

flags: u8

Per-message flags (see MsgFlags).

req_id: u16

Caller-assigned correlation ID. Responses echo the request’s ID.

payload_len: u32

Byte length of the payload following this header in this descriptor.

Implementations

impl VirtqMsgHeader

pub const SIZE: usize

pub const fn new(kind: MsgKind, req_id: u16, payload_len: u32) -> Self

Create a new message header with no flags set.

pub const fn with_flags( kind: MsgKind, flags: MsgFlags, req_id: u16, payload_len: u32, ) -> Self

Create a new header with flags.

pub fn msg_kind(&self) -> Result<MsgKind, u8>

Parse the kind field into a MsgKind enum.

pub fn msg_flags(&self) -> MsgFlags

Interpret the raw flags field as MsgFlags.

pub const fn has_more(&self) -> bool

Returns true if MsgFlags::MORE is set, indicating more descriptors follow for this message.

Trait Implementations

impl Clone for VirtqMsgHeader

fn clone(&self) -> VirtqMsgHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for VirtqMsgHeader

impl Debug for VirtqMsgHeader

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

Formats the value using the given formatter.

impl Pod for VirtqMsgHeader

impl Zeroable for VirtqMsgHeader

fn zeroed() -> Self

Calls zeroed.