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Commit df5d22fa authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by Daniel Borkmann
Browse files

libbpf: introduce bpf_map_lookup_elem_flags() 



Introduce
int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
helper to lookup array/hash/cgroup_local_storage elements with BPF_F_LOCK flag.

Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent e44ac9a2

tools/lib/bpf/bpf.c

+13 −0
Original line number Diff line number Diff line
@@ -368,6 +368,19 @@ int bpf_map_lookup_elem(int fd, const void *key, void *value) 
	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));

}



int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)

{

	union bpf_attr attr;



	bzero(&attr, sizeof(attr));

	attr.map_fd = fd;

	attr.key = ptr_to_u64(key);

	attr.value = ptr_to_u64(value);

	attr.flags = flags;



	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));

}



int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)

{

	union bpf_attr attr;

tools/lib/bpf/bpf.h

+2 −0
Original line number Diff line number Diff line
@@ -110,6 +110,8 @@ LIBBPF_API int bpf_map_update_elem(int fd, const void *key, const void *value, 
				   __u64 flags);



LIBBPF_API int bpf_map_lookup_elem(int fd, const void *key, void *value);

LIBBPF_API int bpf_map_lookup_elem_flags(int fd, const void *key, void *value,

					 __u64 flags);

LIBBPF_API int bpf_map_lookup_and_delete_elem(int fd, const void *key,

					      void *value);

LIBBPF_API int bpf_map_delete_elem(int fd, const void *key);

tools/lib/bpf/libbpf.map

+1 −0
Original line number Diff line number Diff line
@@ -130,4 +130,5 @@ LIBBPF_0.0.2 { 
		bpf_probe_helper;

		bpf_probe_map_type;

		bpf_probe_prog_type;

		bpf_map_lookup_elem_flags;

} LIBBPF_0.0.1;