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| author | Toke Høiland-Jørgensen <toke@redhat.com> | 2020-09-29 14:45:53 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-09-29 22:09:24 +0200 |
| commit | a535909142bf2a6f3a95cabbb8b38ce3860c4807 (patch) | |
| tree | a4be0d6f869c8200ad78c5bdd33e22122842b7de /tools/lib/bpf/bpf.c | |
| parent | bpf: Fix context type resolving for extension programs (diff) | |
| download | linux-a535909142bf2a6f3a95cabbb8b38ce3860c4807.tar.xz linux-a535909142bf2a6f3a95cabbb8b38ce3860c4807.zip | |
libbpf: Add support for freplace attachment in bpf_link_create
This adds support for supplying a target btf ID for the bpf_link_create()
operation, and adds a new bpf_program__attach_freplace() high-level API for
attaching freplace functions with a target.
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/160138355387.48470.18026176785351166890.stgit@toke.dk
Diffstat (limited to 'tools/lib/bpf/bpf.c')
| -rw-r--r-- | tools/lib/bpf/bpf.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 70575a37aa14..d27e34133973 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -586,19 +586,31 @@ int bpf_link_create(int prog_fd, int target_fd, enum bpf_attach_type attach_type, const struct bpf_link_create_opts *opts) { + __u32 target_btf_id, iter_info_len; union bpf_attr attr; if (!OPTS_VALID(opts, bpf_link_create_opts)) return -EINVAL; + iter_info_len = OPTS_GET(opts, iter_info_len, 0); + target_btf_id = OPTS_GET(opts, target_btf_id, 0); + + if (iter_info_len && target_btf_id) + return -EINVAL; + memset(&attr, 0, sizeof(attr)); attr.link_create.prog_fd = prog_fd; attr.link_create.target_fd = target_fd; attr.link_create.attach_type = attach_type; attr.link_create.flags = OPTS_GET(opts, flags, 0); - attr.link_create.iter_info = - ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); - attr.link_create.iter_info_len = OPTS_GET(opts, iter_info_len, 0); + + if (iter_info_len) { + attr.link_create.iter_info = + ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); + attr.link_create.iter_info_len = iter_info_len; + } else if (target_btf_id) { + attr.link_create.target_btf_id = target_btf_id; + } return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr)); } |