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[bpf-next,v4,08/18] bpf: bloom_filter memory usage

Message ID 20230305124615.12358-9-laoar.shao@gmail.com (mailing list archive)
State Accepted
Commit 71a49abe73cb56b15bf0701b5e98b6103480f762
Delegated to: BPF
Headers show
Series bpf: bpf memory usage | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/cc_maintainers warning 2 maintainers not CCed: song@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2 this patch: 2
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 23 lines checked
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bpf/vmtest-bpf-next-PR success PR summary

Commit Message

Yafang Shao March 5, 2023, 12:46 p.m. UTC 
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>
---
 kernel/bpf/bloom_filter.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/bloom_filter.c b/kernel/bpf/bloom_filter.c
index 48ee750..6350c5d 100644
--- 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 @@  static int bloom_map_check_btf(const struct bpf_map *map,
 	.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],
 };