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authorToke Høiland-Jørgensen <toke@redhat.com>2020-09-29 14:45:51 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-09-29 13:09:24 -0700
commit4a1e7c0c63e02daad751842b7880f9bbcdfb6e89 (patch)
tree889732ecf7e8ffe11000a93435bcae1ac68a554b /include/dt-bindings
parent3aac1ead5eb6b76f3d2b8d111e6de1c2de23fb34 (diff)
bpf: Support attaching freplace programs to multiple attach points
This enables support for attaching freplace programs to multiple attach points. It does this by amending the UAPI for bpf_link_Create with a target btf ID that can be used to supply the new attachment point along with the target program fd. The target must be compatible with the target that was supplied at program load time. The implementation reuses the checks that were factored out of check_attach_btf_id() to ensure compatibility between the BTF types of the old and new attachment. If these match, a new bpf_tracing_link will be created for the new attach target, allowing multiple attachments to co-exist simultaneously. The code could theoretically support multiple-attach of other types of tracing programs as well, but since I don't have a use case for any of those, there is no API support for doing so. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/160138355169.48470.17165680973640685368.stgit@toke.dk
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