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authorAndrii Nakryiko <andrii@kernel.org>2020-11-10 04:19:29 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-11-11 02:25:53 +0300
commit5329722057d41aebc31e391907a501feaa42f7d9 (patch)
tree57113db646325ea0474afcd3e2dc93adbd4c5c43 /tools/include
parent951bb64621b8139c0cd99dcadc13e6510c08aa73 (diff)
downloadlinux-5329722057d41aebc31e391907a501feaa42f7d9.tar.xz
bpf: Assign ID to vmlinux BTF and return extra info for BTF in GET_OBJ_INFO
Allocate ID for vmlinux BTF. This makes it visible when iterating over all BTF objects in the system. To allow distinguishing vmlinux BTF (and later kernel module BTF) from user-provided BTFs, expose extra kernel_btf flag, as well as BTF name ("vmlinux" for vmlinux BTF, will equal to module's name for module BTF). We might want to later allow specifying BTF name for user-provided BTFs as well, if that makes sense. But currently this is reserved only for in-kernel BTFs. Having in-kernel BTFs exposed IDs will allow to extend BPF APIs that require in-kernel BTF type with ability to specify BTF types from kernel modules, not just vmlinux BTF. This will be implemented in a follow up patch set for fentry/fexit/fmod_ret/lsm/etc. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20201110011932.3201430-3-andrii@kernel.org
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/uapi/linux/bpf.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 9879d6793e90..162999b12790 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -4466,6 +4466,9 @@ struct bpf_btf_info {
__aligned_u64 btf;
__u32 btf_size;
__u32 id;
+ __aligned_u64 name;
+ __u32 name_len;
+ __u32 kernel_btf;
} __attribute__((aligned(8)));
struct bpf_link_info {