unimore/kernel-hacking-2024-linux-steffo
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bpf: Add arraymap support for bpf_for_each_map_elem() helper

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This patch added support for arraymap and percpu arraymap.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210226204928.3885192-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2021-02-26 12:49:28 -08:00 committed by Alexei Starovoitov
parent 314ee05e2f
commit 06dcdcd4b9
1 changed files with 40 additions and 0 deletions
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40
kernel/bpf/arraymap.c
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@ -625,6 +625,42 @@ static const struct bpf_iter_seq_info iter_seq_info = {
.seq_priv_size = sizeof(struct bpf_iter_seq_array_map_info),
};
static int bpf_for_each_array_elem(struct bpf_map *map, void *callback_fn,
void *callback_ctx, u64 flags)
{
u32 i, key, num_elems = 0;
struct bpf_array *array;
bool is_percpu;
u64 ret = 0;
void *val;
if (flags != 0)
return -EINVAL;
is_percpu = map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
array = container_of(map, struct bpf_array, map);
if (is_percpu)
migrate_disable();
for (i = 0; i < map->max_entries; i++) {
if (is_percpu)
val = this_cpu_ptr(array->pptrs[i]);
else
val = array->value + array->elem_size * i;
num_elems++;
key = i;
ret = BPF_CAST_CALL(callback_fn)((u64)(long)map,
(u64)(long)&key, (u64)(long)val,
(u64)(long)callback_ctx, 0);
/* return value: 0 - continue, 1 - stop and return */
if (ret)
break;
}
if (is_percpu)
migrate_enable();
return num_elems;
}
static int array_map_btf_id;
const struct bpf_map_ops array_map_ops = {
.map_meta_equal = array_map_meta_equal,
@ -643,6 +679,8 @@ const struct bpf_map_ops array_map_ops = {
.map_check_btf = array_map_check_btf,
.map_lookup_batch = generic_map_lookup_batch,
.map_update_batch = generic_map_update_batch,
.map_set_for_each_callback_args = map_set_for_each_callback_args,
.map_for_each_callback = bpf_for_each_array_elem,
.map_btf_name = "bpf_array",
.map_btf_id = &array_map_btf_id,
.iter_seq_info = &iter_seq_info,
@ -660,6 +698,8 @@ const struct bpf_map_ops percpu_array_map_ops = {
.map_delete_elem = array_map_delete_elem,
.map_seq_show_elem = percpu_array_map_seq_show_elem,
.map_check_btf = array_map_check_btf,
.map_set_for_each_callback_args = map_set_for_each_callback_args,
.map_for_each_callback = bpf_for_each_array_elem,
.map_btf_name = "bpf_array",
.map_btf_id = &percpu_array_map_btf_id,
.iter_seq_info = &iter_seq_info,