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bpf: bpf_struct_ops memory usage
A new helper is introduced to calculate bpf_struct_ops memory usage. The result as follows, - before 1: struct_ops name count_map flags 0x0 key 4B value 256B max_entries 1 memlock 4096B btf_id 73 - after 1: struct_ops name count_map flags 0x0 key 4B value 256B max_entries 1 memlock 5016B btf_id 73 Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Link: https://lore.kernel.org/r/20230305124615.12358-13-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -641,6 +641,21 @@ static struct bpf_map *bpf_struct_ops_map_alloc(union bpf_attr *attr)
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return map;
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}
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static u64 bpf_struct_ops_map_mem_usage(const struct bpf_map *map)
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{
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struct bpf_struct_ops_map *st_map = (struct bpf_struct_ops_map *)map;
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const struct bpf_struct_ops *st_ops = st_map->st_ops;
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const struct btf_type *vt = st_ops->value_type;
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u64 usage;
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usage = sizeof(*st_map) +
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vt->size - sizeof(struct bpf_struct_ops_value);
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usage += vt->size;
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usage += btf_type_vlen(vt) * sizeof(struct bpf_links *);
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usage += PAGE_SIZE;
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return usage;
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}
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BTF_ID_LIST_SINGLE(bpf_struct_ops_map_btf_ids, struct, bpf_struct_ops_map)
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const struct bpf_map_ops bpf_struct_ops_map_ops = {
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.map_alloc_check = bpf_struct_ops_map_alloc_check,
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@ -651,6 +666,7 @@ const struct bpf_map_ops bpf_struct_ops_map_ops = {
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.map_delete_elem = bpf_struct_ops_map_delete_elem,
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.map_update_elem = bpf_struct_ops_map_update_elem,
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.map_seq_show_elem = bpf_struct_ops_map_seq_show_elem,
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.map_mem_usage = bpf_struct_ops_map_mem_usage,
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.map_btf_id = &bpf_struct_ops_map_btf_ids[0],
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};
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