From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, mykolal@fb.com,
shuah@kernel.org
Cc: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org,
Roberto Sassu <roberto.sassu@huawei.com>
Subject: [RESEND][PATCH 5/6] libbpf: Introduce bpf_link_get_fd_by_id_opts()
Date: Tue, 4 Oct 2022 15:17:49 +0200 [thread overview]
Message-ID: <20221004131750.2306251-6-roberto.sassu@huaweicloud.com> (raw)
In-Reply-To: <20221004131750.2306251-1-roberto.sassu@huaweicloud.com>
From: Roberto Sassu <roberto.sassu@huawei.com>
Introduce bpf_link_get_fd_by_id_opts(), for symmetry with
bpf_map_get_fd_by_id_opts(), to let the caller pass the newly introduced
data structure bpf_get_fd_opts. Keep the existing bpf_link_get_fd_by_id(),
and call bpf_link_get_fd_by_id_opts() with NULL as opts argument, to
prevent setting open_flags.
Currently, the kernel does not support non-zero open_flags for
bpf_link_get_fd_by_id_opts(), and a call with them will result in an error
returned by the bpf() system call. The caller should always pass zero
open_flags.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
tools/lib/bpf/bpf.c | 12 +++++++++++-
tools/lib/bpf/bpf.h | 2 ++
tools/lib/bpf/libbpf.map | 1 +
3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index f43e8c8afbd3..f3d89a2bdb50 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -1003,19 +1003,29 @@ int bpf_btf_get_fd_by_id(__u32 id)
return bpf_btf_get_fd_by_id_opts(id, NULL);
}
-int bpf_link_get_fd_by_id(__u32 id)
+int bpf_link_get_fd_by_id_opts(__u32 id,
+ const struct bpf_get_fd_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, open_flags);
union bpf_attr attr;
int fd;
+ if (!OPTS_VALID(opts, bpf_get_fd_opts))
+ return libbpf_err(-EINVAL);
+
memset(&attr, 0, attr_sz);
attr.link_id = id;
+ attr.open_flags = OPTS_GET(opts, open_flags, 0);
fd = sys_bpf_fd(BPF_LINK_GET_FD_BY_ID, &attr, attr_sz);
return libbpf_err_errno(fd);
}
+int bpf_link_get_fd_by_id(__u32 id)
+{
+ return bpf_link_get_fd_by_id_opts(id, NULL);
+}
+
int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
{
const size_t attr_sz = offsetofend(union bpf_attr, info);
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 559af0b84299..834809d74c82 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -382,6 +382,8 @@ LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_btf_get_fd_by_id_opts(__u32 id,
const struct bpf_get_fd_opts *opts);
LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id);
+LIBBPF_API int bpf_link_get_fd_by_id_opts(__u32 id,
+ const struct bpf_get_fd_opts *opts);
LIBBPF_API int bpf_link_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 7011d5eec67b..71bf5691a689 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -372,6 +372,7 @@ LIBBPF_1.0.0 {
LIBBPF_1.1.0 {
global:
bpf_btf_get_fd_by_id_opts;
+ bpf_link_get_fd_by_id_opts;
bpf_map_get_fd_by_id_opts;
bpf_prog_get_fd_by_id_opts;
user_ring_buffer__discard;
--
2.25.1
next prev parent reply other threads:[~2022-10-04 13:19 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-04 13:17 [RESEND][PATCH 0/6] Add _opts variant for bpf_*_get_fd_by_id() Roberto Sassu
2022-10-04 13:17 ` [RESEND][PATCH 1/6] libbpf: Fix LIBBPF_1.0.0 declaration in libbpf.map Roberto Sassu
2022-10-05 23:02 ` Andrii Nakryiko
2022-10-04 13:17 ` [RESEND][PATCH 2/6] libbpf: Define bpf_get_fd_opts and introduce bpf_map_get_fd_by_id_opts() Roberto Sassu
2022-10-05 23:04 ` Andrii Nakryiko
2022-10-04 13:17 ` [RESEND][PATCH 3/6] libbpf: Introduce bpf_prog_get_fd_by_id_opts() Roberto Sassu
2022-10-04 13:17 ` [RESEND][PATCH 4/6] libbpf: Introduce bpf_btf_get_fd_by_id_opts() Roberto Sassu
2022-10-05 23:06 ` Andrii Nakryiko
2022-10-04 13:17 ` Roberto Sassu [this message]
2022-10-04 13:17 ` [RESEND][PATCH 6/6] selftests/bpf: Add tests for _opts variants of bpf_*_get_fd_by_id() Roberto Sassu
2022-10-05 23:13 ` Andrii Nakryiko
2022-10-05 23:14 ` [RESEND][PATCH 0/6] Add _opts variant for bpf_*_get_fd_by_id() Andrii Nakryiko
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