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feat(drivers/net): Add loopback network driver #1834
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,74 @@ | ||
use alloc::collections::vec_deque::VecDeque; | ||
use alloc::vec::Vec; | ||
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use hermit_sync::InterruptTicketMutex; | ||
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use crate::drivers::net::NetworkDriver; | ||
use crate::drivers::{Driver, InterruptLine}; | ||
use crate::executor::device::{RxToken, TxToken}; | ||
use crate::mm::device_alloc::DeviceAlloc; | ||
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pub(crate) struct LoopbackDriver(VecDeque<Vec<u8, DeviceAlloc>>); | ||
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impl LoopbackDriver { | ||
pub(crate) const fn new() -> Self { | ||
Self(VecDeque::new()) | ||
} | ||
} | ||
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impl Driver for LoopbackDriver { | ||
fn get_interrupt_number(&self) -> InterruptLine { | ||
// This is called by mmio / pci specific code, this driver | ||
// is using neither. | ||
unimplemented!() | ||
} | ||
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fn get_name(&self) -> &'static str { | ||
"loopback" | ||
} | ||
} | ||
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impl NetworkDriver for LoopbackDriver { | ||
fn get_mac_address(&self) -> [u8; 6] { | ||
// This matches Linux' behavior | ||
[0; 6] | ||
} | ||
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fn get_mtu(&self) -> u16 { | ||
// Technically Linux uses 2^16, which we cannot use until we switch | ||
// to u32 for MTU | ||
u16::MAX | ||
} | ||
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fn receive_packet(&mut self) -> Option<(RxToken, TxToken)> { | ||
self.0 | ||
.pop_front() | ||
.map(move |buffer| (RxToken::new(buffer), TxToken::new())) | ||
} | ||
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fn send_packet<R, F>(&mut self, len: usize, f: F) -> R | ||
where | ||
F: FnOnce(&mut [u8]) -> R, | ||
{ | ||
let mut buffer = Vec::with_capacity_in(len, DeviceAlloc); | ||
buffer.resize(len, 0); | ||
let result = f(&mut buffer); | ||
self.0.push_back(buffer); | ||
result | ||
} | ||
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fn has_packet(&self) -> bool { | ||
!self.0.is_empty() | ||
} | ||
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fn set_polling_mode(&mut self, _value: bool) { | ||
// no-op | ||
} | ||
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fn handle_interrupt(&mut self) { | ||
// no-op | ||
} | ||
} | ||
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pub(crate) static LOOPBACK: InterruptTicketMutex<LoopbackDriver> = | ||
InterruptTicketMutex::new(LoopbackDriver::new()); |
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