92 lines
2.1 KiB
Rust
92 lines
2.1 KiB
Rust
#[cfg(not(feature = "rust-1_28"))]
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use alloc::collections::VecDeque;
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use alloc::vec::Vec;
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#[cfg(feature = "rust-1_28")]
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use alloc::VecDeque;
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use crate::phy::{self, Device, DeviceCapabilities, Medium};
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use crate::time::Instant;
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use crate::Result;
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/// A loopback device.
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#[derive(Debug)]
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pub struct Loopback {
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queue: VecDeque<Vec<u8>>,
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medium: Medium,
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}
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#[allow(clippy::new_without_default)]
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impl Loopback {
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/// Creates a loopback device.
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///
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/// Every packet transmitted through this device will be received through it
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/// in FIFO order.
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pub fn new(medium: Medium) -> Loopback {
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Loopback {
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queue: VecDeque::new(),
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medium,
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}
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}
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}
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impl<'a> Device<'a> for Loopback {
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type RxToken = RxToken;
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type TxToken = TxToken<'a>;
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fn capabilities(&self) -> DeviceCapabilities {
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DeviceCapabilities {
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max_transmission_unit: 65535,
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medium: self.medium,
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..DeviceCapabilities::default()
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}
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}
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fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> {
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self.queue.pop_front().map(move |buffer| {
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let rx = RxToken { buffer };
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let tx = TxToken {
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queue: &mut self.queue,
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};
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(rx, tx)
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})
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}
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fn transmit(&'a mut self) -> Option<Self::TxToken> {
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Some(TxToken {
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queue: &mut self.queue,
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})
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}
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}
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#[doc(hidden)]
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pub struct RxToken {
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buffer: Vec<u8>,
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}
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impl phy::RxToken for RxToken {
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fn consume<R, F>(mut self, _timestamp: Instant, f: F) -> Result<R>
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where
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F: FnOnce(&mut [u8]) -> Result<R>,
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{
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f(&mut self.buffer)
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}
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}
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#[doc(hidden)]
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pub struct TxToken<'a> {
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queue: &'a mut VecDeque<Vec<u8>>,
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}
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impl<'a> phy::TxToken for TxToken<'a> {
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fn consume<R, F>(self, _timestamp: Instant, len: usize, f: F) -> Result<R>
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where
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F: FnOnce(&mut [u8]) -> Result<R>,
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{
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let mut buffer = Vec::new();
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buffer.resize(len, 0);
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let result = f(&mut buffer);
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self.queue.push_back(buffer);
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result
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}
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}
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