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libbpf: Introduce bpf_prog_stream_read() API

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Introduce a libbpf API so that users can read data from a given BPF
stream for a BPF prog fd. For now, only the low-level syscall wrapper
is provided, we can add a bpf_program__* accessor as a follow up if
needed.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250703204818.925464-11-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi authored and Andrii Nakryiko committed 2025-07-16 08:57:15 -07:00
1 parent 9bb5c46da4
commit c2850a3840
3 files changed
+42
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src/bpf.c
+20
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@@ -1375,3 +1375,23 @@ int bpf_token_create(int bpffs_fd, struct bpf_token_create_opts *opts)
fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz);
return libbpf_err_errno(fd);
}
int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len,
struct bpf_prog_stream_read_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, prog_stream_read);
union bpf_attr attr;
int err;
if (!OPTS_VALID(opts, bpf_prog_stream_read_opts))
return libbpf_err(-EINVAL);
memset(&attr, 0, attr_sz);
attr.prog_stream_read.stream_buf = ptr_to_u64(buf);
attr.prog_stream_read.stream_buf_len = buf_len;
attr.prog_stream_read.stream_id = stream_id;
attr.prog_stream_read.prog_fd = prog_fd;
err = sys_bpf(BPF_PROG_STREAM_READ_BY_FD, &attr, attr_sz);
return libbpf_err_errno(err);
}