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[192.26.29.3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49ff0658747sm32856695e9.1.2026.09.24.21.55.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 21:55:46 -0700 (PDT) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: Emil Tsalapatis , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Tejun Heo , kkd@meta.com, kernel-team@meta.com Subject: [PATCH bpf-next v3 3/5] libbpf: Add bpf_prog_stream_open() Date: Fri, 25 Sep 2026 06:55:30 +0200 Message-ID: <20260925045536.1480933-4-memxor@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260925045536.1480933-1-memxor@gmail.com> References: <20260925045536.1480933-1-memxor@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3310; i=memxor@gmail.com; h=from:subject; bh=9j4/hJzuGbSy56wRpsLnkjePWU2iaLUv31v/Tzv+pCo=; b=owGbwMvMwCXmrmtenRyi38x4Wi2JIWvrv6kWhkc/H3KsrPnX6bjtS/+Oh0ZdG2SS9q/hsv3QY 3P4xUStjlIWBjEuBlkxRZaS//uYjE9U/g60XcYNM4eVCWQIAxenAEykfgcjw4qj++fW193RM2vs vz2xNLpu2dKcw5f/mXA873krn3/j+2xGhrW7982bsn/eMf/i2ddl34RzBnValhovU36YX1CVdTj zNgMA X-Developer-Key: i=memxor@gmail.com; a=openpgp; fpr=B34BD741DE8494B76E2F717880EF20021D46C59B Content-Transfer-Encoding: 8bit Expose the BPF_PROG_STREAM_OPEN command through a low-level libbpf wrapper. The options structure carries stream open flags, including non-blocking mode, while leaving room for future extensions. Reviewed-by: Emil Tsalapatis Signed-off-by: Kumar Kartikeya Dwivedi --- tools/lib/bpf/bpf.c | 19 +++++++++++++++++++ tools/lib/bpf/bpf.h | 24 ++++++++++++++++++++++++ tools/lib/bpf/libbpf.map | 1 + 3 files changed, 44 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index a9de7f107cf7..b49822d212ae 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -1466,6 +1466,25 @@ int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len, return libbpf_err_errno(err); } +int bpf_prog_stream_open(int prog_fd, __u32 stream_id, + const struct bpf_prog_stream_open_opts *opts) +{ + const size_t attr_sz = offsetofend(union bpf_attr, prog_stream_open); + union bpf_attr attr; + int fd; + + if (!OPTS_VALID(opts, bpf_prog_stream_open_opts)) + return libbpf_err(-EINVAL); + + memset(&attr, 0, attr_sz); + attr.prog_stream_open.prog_fd = prog_fd; + attr.prog_stream_open.stream_id = stream_id; + attr.prog_stream_open.flags = OPTS_GET(opts, flags, 0); + + fd = sys_bpf_fd(BPF_PROG_STREAM_OPEN, &attr, attr_sz); + return libbpf_err_errno(fd); +} + int bpf_prog_assoc_struct_ops(int prog_fd, int map_fd, struct bpf_prog_assoc_struct_ops_opts *opts) { diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 490e8cb4ba53..826d9cc9ab65 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -759,10 +759,34 @@ struct bpf_prog_stream_read_opts { * * @return The number of bytes read, on success; negative error code, otherwise * (errno is also set to the error code) + * + * For blocking reads and polling, prefer **bpf_prog_stream_open**. */ LIBBPF_API int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len, struct bpf_prog_stream_read_opts *opts); +struct bpf_prog_stream_open_opts { + size_t sz; + __u32 flags; + size_t :0; +}; +#define bpf_prog_stream_open_opts__last_field flags + +/** + * @brief **bpf_prog_stream_open** opens a file descriptor for a BPF stream of + * a given BPF program. + * + * @param prog_fd FD for the BPF program whose BPF stream is to be opened. + * @param stream_id ID of the BPF stream to be opened. + * @param opts optional options, can be NULL. BPF_F_STREAM_NONBLOCK requests a + * non-blocking descriptor. + * + * @return A new stream FD, on success; negative error code, otherwise (errno + * is also set to the error code) + */ +LIBBPF_API int bpf_prog_stream_open(int prog_fd, __u32 stream_id, + const struct bpf_prog_stream_open_opts *opts); + struct bpf_prog_assoc_struct_ops_opts { size_t sz; __u32 flags; diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 18d27d20102e..53b7b591325f 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -459,6 +459,7 @@ LIBBPF_1.7.0 { LIBBPF_1.8.0 { global: bpf_map__attach_cgroup_opts; + bpf_prog_stream_open; bpf_program__add_flags; bpf_program__attach_tracing_multi; bpf_program__clear_flags; -- 2.53.0