Enum ReplyChain 

pub enum ReplyChain<M: MemOps> {
    Writable(WritableChain<M>),
    Ack(AckChain),
}

Consumer-side chain reply, either writable or ack-only.

Created by VirtqConsumer::poll. Must be submitted back via VirtqConsumer::complete to release the descriptor.

Variants

Writable(WritableChain<M>)

Reply with writable buffer capacity. Use the write* methods on WritableChain to fill the response buffer.

Ack(AckChain)

Ack-only reply (for chains with only readable buffers). No response buffer. Just pass back to VirtqConsumer::complete to acknowledge.

Implementations

impl<M: MemOps> ReplyChain<M>

pub fn token(&self) -> Token

The token identifying this reply.

pub fn written(&self) -> usize

Number of bytes written (0 for Ack).

pub fn into_writable(self) -> Result<WritableChain<M>, AckChain>

Convert into the writable form.

Returns the AckChain unchanged as Err for ack-only replies, so the completion capability is never silently dropped.

Trait Implementations

impl<M: MemOps> From<AckChain> for ReplyChain<M>

fn from(ack: AckChain) -> Self

Converts to this type from the input type.

impl<M: MemOps> From<WritableChain<M>> for ReplyChain<M>

fn from(wc: WritableChain<M>) -> Self

Converts to this type from the input type.