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libbpf: Add "map_extra" as a per-map-type extra flag

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This patch adds the libbpf infrastructure for supporting a
per-map-type "map_extra" field, whose definition will be
idiosyncratic depending on map type.

For example, for the bloom filter map, the lower 4 bits of
map_extra is used to denote the number of hash functions.

Please note that until libbpf 1.0 is here, the
"bpf_create_map_params" struct is used as a temporary
means for propagating the map_extra field to the kernel.

Signed-off-by: Joanne Koong <joannekoong@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211027234504.30744-3-joannekoong@fb.com
This commit is contained in:
Joanne Koong
2021-10-27 16:45:01 -07:00
committed by Andrii Nakryiko
parent 11f873fd5b
commit 28c8a2c179
7 changed files with 91 additions and 9 deletions
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25
src/libbpf_internal.h
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@@ -193,8 +193,9 @@ enum map_def_parts {
MAP_DEF_NUMA_NODE = 0x080,
MAP_DEF_PINNING = 0x100,
MAP_DEF_INNER_MAP = 0x200,
MAP_DEF_MAP_EXTRA = 0x400,
MAP_DEF_ALL = 0x3ff, /* combination of all above */
MAP_DEF_ALL = 0x7ff, /* combination of all above */
};
struct btf_map_def {
@@ -208,6 +209,7 @@ struct btf_map_def {
__u32 map_flags;
__u32 numa_node;
__u32 pinning;
__u64 map_extra;
};
int parse_btf_map_def(const char *map_name, struct btf *btf,
@@ -303,6 +305,27 @@ struct bpf_prog_load_params {
int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr);
struct bpf_create_map_params {
const char *name;
enum bpf_map_type map_type;
__u32 map_flags;
__u32 key_size;
__u32 value_size;
__u32 max_entries;
__u32 numa_node;
__u32 btf_fd;
__u32 btf_key_type_id;
__u32 btf_value_type_id;
__u32 map_ifindex;
union {
__u32 inner_map_fd;
__u32 btf_vmlinux_value_type_id;
};
__u64 map_extra;
};
int libbpf__bpf_create_map_xattr(const struct bpf_create_map_params *create_attr);
struct btf *btf_get_from_fd(int btf_fd, struct btf *base_btf);
void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type,
const char **prefix, int *kind);