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49 lines
1.7 KiB
Rust
49 lines
1.7 KiB
Rust
use core::{cell::UnsafeCell, mem};
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use crate::{
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EbpfContext, bindings::bpf_map_type::BPF_MAP_TYPE_STACK_TRACE, btf_maps::AyaBtfMapMarker,
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helpers::bpf_get_stackid,
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};
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const PERF_MAX_STACK_DEPTH: usize = 127;
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const VALUE_SIZE: usize = mem::size_of::<u64>() * PERF_MAX_STACK_DEPTH;
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#[allow(dead_code)]
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pub struct StackTraceDef<const M: usize, const F: usize = 0> {
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r#type: *const [i32; BPF_MAP_TYPE_STACK_TRACE as usize],
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key_size: *const [i32; mem::size_of::<u32>()],
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value_size: *const [i32; VALUE_SIZE],
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max_entries: *const [i32; M],
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map_flags: *const [i32; F],
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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 StackTrace<const M: usize, const F: usize = 0>(UnsafeCell<StackTraceDef<M, F>>);
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unsafe impl<const M: usize, const F: usize> Sync for StackTrace<M, F> {}
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impl<const M: usize, const F: usize> StackTrace<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(StackTraceDef {
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r#type: &[0i32; BPF_MAP_TYPE_STACK_TRACE as usize],
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key_size: &[0i32; mem::size_of::<u32>()],
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value_size: &[0i32; VALUE_SIZE],
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max_entries: &[0i32; M],
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map_flags: &[0i32; F],
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_anon: AyaBtfMapMarker::new(),
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}))
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}
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pub unsafe fn get_stackid<C: EbpfContext>(&self, ctx: &C, flags: u64) -> Result<i64, i64> {
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let ret = unsafe { bpf_get_stackid(ctx.as_ptr(), self.0.get() as *mut _, flags) };
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if ret < 0 { Err(ret) } else { Ok(ret) }
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}
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}
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