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bpf: Implement bpf iterator for array maps

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The bpf iterators for array and percpu array
are implemented. Similar to hash maps, for percpu
array map, bpf program will receive values
from all cpus.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200723184115.590532-1-yhs@fb.com
This commit is contained in:
Yonghong Song
2020-07-23 11:41:15 -07:00
committed by Alexei Starovoitov
parent d6c4503cc2
commit d3cc2ab546
2 changed files with 142 additions and 2 deletions
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6
kernel/bpf/map_iter.c
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@@ -106,10 +106,12 @@ static int bpf_iter_check_map(struct bpf_prog *prog,
bool is_percpu = false;
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH)
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY)
is_percpu = true;
else if (map->map_type != BPF_MAP_TYPE_HASH &&
map->map_type != BPF_MAP_TYPE_LRU_HASH)
map->map_type != BPF_MAP_TYPE_LRU_HASH &&
map->map_type != BPF_MAP_TYPE_ARRAY)
return -EINVAL;
key_acc_size = prog->aux->max_rdonly_access;