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52 lines
1.7 KiB
Rust
52 lines
1.7 KiB
Rust
use core::{cell::UnsafeCell, mem, ptr};
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use crate::{
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bindings::bpf_map_type::BPF_MAP_TYPE_STACK,
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btf_maps::AyaBtfMapMarker,
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helpers::{bpf_map_pop_elem, bpf_map_push_elem},
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};
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#[allow(dead_code)]
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pub struct StackDef<T, const M: usize, const F: usize = 0> {
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r#type: *const [i32; BPF_MAP_TYPE_STACK as usize],
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value: *const T,
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max_entries: *const [i32; M],
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// Anonymize the struct.
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_anon: AyaBtfMapMarker,
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}
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#[repr(transparent)]
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pub struct Stack<T, const M: usize, const F: usize = 0>(UnsafeCell<StackDef<T, M, F>>);
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unsafe impl<T: Sync, const M: usize, const F: usize> Sync for Stack<T, M, F> {}
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impl<T, const M: usize, const F: usize> Stack<T, M, F> {
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// Implementing `Default` makes no sense in this case. Maps are always
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// global variables, so they need to be instantiated with a `const` method.
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// The `Default::default` method is not `const`.
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#[allow(clippy::new_without_default)]
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pub const fn new() -> Self {
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Self(UnsafeCell::new(StackDef {
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r#type: &[0i32; BPF_MAP_TYPE_STACK as usize],
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value: ptr::null(),
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max_entries: &[0i32; M],
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_anon: AyaBtfMapMarker::new(),
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}))
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}
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pub fn push(&self, value: &T, flags: u64) -> Result<(), i64> {
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let ret =
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unsafe { bpf_map_push_elem(self.0.get() as _, value as *const _ as *const _, flags) };
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(ret == 0).then_some(()).ok_or(ret)
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}
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pub fn pop(&self) -> Option<T> {
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unsafe {
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let mut value = mem::MaybeUninit::uninit();
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let ret = bpf_map_pop_elem(self.0.get() as _, value.as_mut_ptr() as *mut _);
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(ret == 0).then_some(value.assume_init())
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}
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}
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}
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