bpf: bloom_filter memory usage

Introduce a new helper to calculate the bloom_filter memory usage.

The result as follows,
- before
16: bloom_filter  flags 0x0
        key 0B  value 8B  max_entries 65536  memlock 524288B

- after
16: bloom_filter  flags 0x0
        key 0B  value 8B  max_entries 65536  memlock 65856B

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230305124615.12358-9-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/kernel/bpf/bloom_filter.c b/kernel/bpf/bloom_filter.c
index 48ee750849f25772ebe7f5cc325be53c509b33b0..6350c5d35a9beed7a801d2a24850cde9e653cabe 100644 (file)
--- a/kernel/bpf/bloom_filter.c
+++ b/kernel/bpf/bloom_filter.c
@@ -193,6 +193,17 @@ static int bloom_map_check_btf(const struct bpf_map *map,
        return btf_type_is_void(key_type) ? 0 : -EINVAL;
 }
 
+static u64 bloom_map_mem_usage(const struct bpf_map *map)
+{
+       struct bpf_bloom_filter *bloom;
+       u64 bitset_bytes;
+
+       bloom = container_of(map, struct bpf_bloom_filter, map);
+       bitset_bytes = BITS_TO_BYTES((u64)bloom->bitset_mask + 1);
+       bitset_bytes = roundup(bitset_bytes, sizeof(unsigned long));
+       return sizeof(*bloom) + bitset_bytes;
+}
+
 BTF_ID_LIST_SINGLE(bpf_bloom_map_btf_ids, struct, bpf_bloom_filter)
 const struct bpf_map_ops bloom_filter_map_ops = {
        .map_meta_equal = bpf_map_meta_equal,
@@ -206,5 +217,6 @@ const struct bpf_map_ops bloom_filter_map_ops = {
        .map_update_elem = bloom_map_update_elem,
        .map_delete_elem = bloom_map_delete_elem,
        .map_check_btf = bloom_map_check_btf,
+       .map_mem_usage = bloom_map_mem_usage,
        .map_btf_id = &bpf_bloom_map_btf_ids[0],
 };