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[192.26.29.3]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-482fbb2e6e8sm16655316f8f.32.2026.08.30.02.35.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 30 Aug 2026 02:35:23 -0700 (PDT) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Emil Tsalapatis , Tejun Heo , kkd@meta.com, kernel-team@meta.com Subject: [PATCH bpf-next v1 4/6] libbpf: Add bpf_prog_stream_open() Date: Sun, 30 Aug 2026 11:35:09 +0200 Message-ID: <20260830093514.4105972-5-memxor@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260830093514.4105972-1-memxor@gmail.com> References: <20260830093514.4105972-1-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=3225; i=memxor@gmail.com; h=from:subject; bh=e89wgUDkmnbbCoI2NGthfmbiU/M4pSFJZwxvWT9Lu5U=; b=owGbwMvMwCXmrmtenRyi38x4Wi2JIWvyx63vGd9dPCx0ZG0JZ+UMrTssbj2fLn+cde5I4dsrb 5gcb0083FHKwiDGxSArpshS8n8fk/GJyt+Btsu4YeawMoEMYeDiFICJBP1l+O+UcWynwA3P/7MZ Z58x3b0xMtpoIVNrxfnp/xt2fMtdlbGd4X/4lId7JvGrxdW5KL+SsO1+515dW72W58DDxRx3xAX z27gB 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. 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 96819c082c77..5186f6245879 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -1464,6 +1464,25 @@ 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 7534a593edae..860c5644ec1e 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -758,10 +758,34 @@ 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 08ab2ea881fb..a89e10811a73 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -458,6 +458,7 @@ LIBBPF_1.7.0 { LIBBPF_1.8.0 { global: + bpf_prog_stream_open; bpf_program__attach_tracing_multi; bpf_program__clone; btf__find_by_name_kind_own; -- 2.53.0