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authorYonghong Song <yhs@fb.com>2020-05-09 10:59:01 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-05-09 17:05:26 -0700
commitde4e05cac46d206f9090051ef09930514bff73e4 (patch)
tree8464f4f13b9cd5f7c8d027ebdfdf09505c9a00d7 /include/linux/bpf_types.h
parent15d83c4d7cef5c067a8b075ce59e97df4f60706e (diff)
bpf: Support bpf tracing/iter programs for BPF_LINK_CREATE
Given a bpf program, the step to create an anonymous bpf iterator is: - create a bpf_iter_link, which combines bpf program and the target. In the future, there could be more information recorded in the link. A link_fd will be returned to the user space. - create an anonymous bpf iterator with the given link_fd. The bpf_iter_link can be pinned to bpffs mount file system to create a file based bpf iterator as well. The benefit to use of bpf_iter_link: - using bpf link simplifies design and implementation as bpf link is used for other tracing bpf programs. - for file based bpf iterator, bpf_iter_link provides a standard way to replace underlying bpf programs. - for both anonymous and free based iterators, bpf link query capability can be leveraged. The patch added support of tracing/iter programs for BPF_LINK_CREATE. A new link type BPF_LINK_TYPE_ITER is added to facilitate link querying. Currently, only prog_id is needed, so there is no additional in-kernel show_fdinfo() and fill_link_info() hook is needed for BPF_LINK_TYPE_ITER link. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200509175901.2475084-1-yhs@fb.com
Diffstat (limited to 'include/linux/bpf_types.h')
-rw-r--r--include/linux/bpf_types.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h
index 8345cdf553b8..29d22752fc87 100644
--- a/include/linux/bpf_types.h
+++ b/include/linux/bpf_types.h
@@ -124,3 +124,4 @@ BPF_LINK_TYPE(BPF_LINK_TYPE_TRACING, tracing)
#ifdef CONFIG_CGROUP_BPF
BPF_LINK_TYPE(BPF_LINK_TYPE_CGROUP, cgroup)
#endif
+BPF_LINK_TYPE(BPF_LINK_TYPE_ITER, iter)