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raw_map_for_each_elem

kbpf_basic::helper

Function raw_map_for_each_elem 

Source 
pub fn raw_map_for_each_elem<F: KernelAuxiliaryOps>(
    map: *mut c_void,
    cb: *const c_void,
    ctx: *const c_void,
    flags: u64,
) -> i64
Expand description

For each element in map, call callback_fn function with map, callback_ctx and other map-specific parameters. The callback_fn should be a static function and the callback_ctx should be a pointer to the stack. The flags is used to control certain aspects of the helper. Currently, the flags must be 0.

The following are a list of supported map types and their respective expected callback signatures:

  • BPF_MAP_TYPE_HASH
  • BPF_MAP_TYPE_PERCPU_HASH
  • BPF_MAP_TYPE_LRU_HASH
  • BPF_MAP_TYPE_LRU_PERCPU_HASH
  • BPF_MAP_TYPE_ARRAY
  • BPF_MAP_TYPE_PERCPU_ARRAY

long (*callback_fn)(struct bpf_map *map, const void key, void *value, void *ctx);

For per_cpu maps, the map_value is the value on the cpu where the bpf_prog is running.