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aya/ebpf/aya-ebpf/src/maps/array.rs

77 lines
2.1 KiB
Rust

use core::{cell::UnsafeCell, marker::PhantomData, mem, ptr::NonNull};
use aya_ebpf_cty::c_long;
use crate::{
bindings::{bpf_map_def, bpf_map_type::BPF_MAP_TYPE_ARRAY},
insert, lookup,
maps::PinningType,
};
#[repr(transparent)]
pub struct Array<T> {
def: UnsafeCell<bpf_map_def>,
_t: PhantomData<T>,
}
unsafe impl<T: Sync> Sync for Array<T> {}
impl<T> Array<T> {
pub const fn with_max_entries(max_entries: u32, flags: u32) -> Array<T> {
Array {
def: UnsafeCell::new(bpf_map_def {
type_: BPF_MAP_TYPE_ARRAY,
key_size: mem::size_of::<u32>() as u32,
value_size: mem::size_of::<T>() as u32,
max_entries,
map_flags: flags,
id: 0,
pinning: PinningType::None as u32,
}),
_t: PhantomData,
}
}
pub const fn pinned(max_entries: u32, flags: u32) -> Array<T> {
Array {
def: UnsafeCell::new(bpf_map_def {
type_: BPF_MAP_TYPE_ARRAY,
key_size: mem::size_of::<u32>() as u32,
value_size: mem::size_of::<T>() as u32,
max_entries,
map_flags: flags,
id: 0,
pinning: PinningType::ByName as u32,
}),
_t: PhantomData,
}
}
#[inline(always)]
pub fn get(&self, index: u32) -> Option<&T> {
// FIXME: alignment
unsafe { self.lookup(index).map(|p| p.as_ref()) }
}
#[inline(always)]
pub fn get_ptr(&self, index: u32) -> Option<*const T> {
unsafe { self.lookup(index).map(|p| p.as_ptr() as *const T) }
}
#[inline(always)]
pub fn get_ptr_mut(&self, index: u32) -> Option<*mut T> {
unsafe { self.lookup(index).map(|p| p.as_ptr()) }
}
#[inline(always)]
unsafe fn lookup(&self, index: u32) -> Option<NonNull<T>> {
lookup(self.def.get(), &index)
}
/// Sets the value of the element at the given index.
#[inline(always)]
pub fn set(&self, index: u32, value: &T, flags: u64) -> Result<(), c_long> {
insert(self.def.get(), &index, value, flags)
}
}