105 lines
2.5 KiB
Rust
105 lines
2.5 KiB
Rust
use core::task::Waker;
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use smoltcp::phy::Device as SmolDevice;
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use smoltcp::phy::DeviceCapabilities;
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use smoltcp::time::Instant as SmolInstant;
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use crate::packet_pool::PacketBoxExt;
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use crate::Result;
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use crate::{Packet, PacketBox, PacketBuf};
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#[derive(PartialEq, Eq, Clone, Copy)]
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pub enum LinkState {
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Down,
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Up,
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}
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pub trait Device {
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fn is_transmit_ready(&mut self) -> bool;
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fn transmit(&mut self, pkt: PacketBuf);
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fn receive(&mut self) -> Option<PacketBuf>;
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fn register_waker(&mut self, waker: &Waker);
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fn capabilities(&mut self) -> DeviceCapabilities;
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fn link_state(&mut self) -> LinkState;
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fn ethernet_address(&mut self) -> [u8; 6];
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}
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pub struct DeviceAdapter {
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pub device: &'static mut dyn Device,
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caps: DeviceCapabilities,
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}
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impl DeviceAdapter {
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pub(crate) fn new(device: &'static mut dyn Device) -> Self {
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Self {
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caps: device.capabilities(),
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device,
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}
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}
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}
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impl<'a> SmolDevice<'a> for DeviceAdapter {
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type RxToken = RxToken;
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type TxToken = TxToken<'a>;
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fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> {
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let tx_pkt = PacketBox::new(Packet::new())?;
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let rx_pkt = self.device.receive()?;
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let rx_token = RxToken { pkt: rx_pkt };
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let tx_token = TxToken {
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device: self.device,
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pkt: tx_pkt,
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};
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Some((rx_token, tx_token))
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}
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/// Construct a transmit token.
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fn transmit(&'a mut self) -> Option<Self::TxToken> {
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if !self.device.is_transmit_ready() {
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return None;
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}
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let tx_pkt = PacketBox::new(Packet::new())?;
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Some(TxToken {
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device: self.device,
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pkt: tx_pkt,
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})
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}
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/// Get a description of device capabilities.
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fn capabilities(&self) -> DeviceCapabilities {
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self.caps.clone()
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}
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}
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pub struct RxToken {
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pkt: PacketBuf,
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}
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impl smoltcp::phy::RxToken for RxToken {
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fn consume<R, F>(mut self, _timestamp: SmolInstant, 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.pkt)
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}
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}
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pub struct TxToken<'a> {
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device: &'a mut dyn Device,
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pkt: PacketBox,
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}
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impl<'a> smoltcp::phy::TxToken for TxToken<'a> {
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fn consume<R, F>(self, _timestamp: SmolInstant, 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 buf = self.pkt.slice(0..len);
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let r = f(&mut buf)?;
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self.device.transmit(buf);
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Ok(r)
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}
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}
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