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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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src/libbpf.map
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@@ -389,6 +389,8 @@ LIBBPF_0.5.0 {
LIBBPF_0.6.0 {
global:
bpf_map__map_extra;
bpf_map__set_map_extra;
bpf_object__next_map;
bpf_object__next_program;
bpf_object__prev_map;